In this paper, nitrogen-doped graphene quantum dots (N-GQDs) were combined with Gadolinium ions (Gd3+) by a surface modification to obtain magneto-optical dual-functional N-GQDs/Gd3+ nanoparticles. The morphology of obtained composite was characterized by field emission scanning electron microscopy and transmission electron microscopy. Luminescence and magnetic properties were measured by a fluorescence spectrophotometer and a vibrating sample magnetometer, respectively. Results indicate that well-dispersed spherical N-GQDs/Gd3+ nanoparticles have an average diameter of 7 nm. N-doping significantly increases the luminescence of particles with an optimal luminescence intensity at 20 °C and pH = 9. X-ray photoelectron spectroscopy results indicate that the N-doping introduces pyrrolic N as an electron donor, enhancing fluorescence by increasing the surface electron cloud density of N-GQDs. In addition, density functional theory calculation results reveal that N-doping reduces the band gap of N-GQDs/Gd3+, enabling electronic transitions to higher energy levels and generating more activation sites, thereby enhancing luminescence. Compared to N-GQDs/Gd3+ prepared at 20 °C, the saturated magnetization of particles prepared at 40 °C is 0.85 emu/g, indicating a better magnetic response. The above results suggest that bifunctional nanomaterials N-GQDs/Gd3+ with excellent optical properties and magnetism can be better used for fluorescence and magnetic resonance imaging.

In this work, a series of self-activated KYb(MoO4)2 phosphors with various x at% Er3+ doping concentrations (x = 0.5, 1, 3, 5, 8, 10, 15) was synthesized by the solid–state reaction method. The phase structure of the as-prepared samples was analyzed by X-ray diffraction (XRD), XRD Rietveld refinement and Fourier transform infrared (FT-IR) spectroscopy. The as-prepared samples retain the orthorhombic structure with space group of Pbcn even Er3+ doping concentration up to 15 at%. High-purity upconversion (UC) green emission with green to red intensity ratio of 55 is observed from the as-prepared samples upon the excitation of 980 nm semiconductor laser and the optimum doping concentration of Er3+ ions in the self-activated KYb(MoO4)2 host is revealed as 3 at%. The strong green UC emission is confirmed as a two-photon process based on the power-dependent UC spectra. In addition, the fluorescence intensity ratios (FIRs) of the two thermally-coupled energy levels, namely 2H11/2 and 4S3/2, of Er3+ ions were investigated in the temperature region 300–570 K to evaluate the optical temperature sensor behavior of the sample. The maximum relative sensitivity (SR) is determined to be 0.0069 K−1 at 300 K and the absolute sensitivity (SA) is determined to be 0.0126 K−1 at 300 K. The SA of self-activated KYb(MoO4)2:Er3+ is almost twice that of traditional KY(MoO4)2:Er3+/Yb3+ codoping phosphor. The results demonstrate that Er3+ ions doped self-activated KYb(MoO4)2 phosphor has promising application in visible display, trademark security and optical temperature sensors.

Rare earth-doped spinel nano ferrites are attaining importance as heterogeneous nanocatalysts for the degradation of organic effluents. Rare earth metal doping increases the electrical and optical properties, as well as the surface-to-volume ratio of the bare sample. In this work, NiFe2O4 (NF) and Nd-NiFe2O4 (NF-1) were successfully synthesized via the co-precipitation route. Carbon nanotubes (CNT)-based nanocomposite (NF-2) was prepared using the ultra-sonication method. The prepared materials were analyzed via various physiochemical approaches. The degradation efficiency of these materials was analyzed for the degradation of Rhodamine B, methylene blue, and benzoic acid. NF-2 shows the highest efficiency among all the prepared catalysts. It shows 83.87%, 90.80%, and 66.96% degradation of Rhodamine B, methylene blue, and benzoic acid, respectively. The reason for the superior activity of NF-2 is the existence of rare earth Nd ions and CNTs. The surface area of NF increases due to the presence of carbon nanotubes and enhanced surface area provides more active sites for the degradation reaction.

Sintered Nd-Ce-Fe-B magnets were grain boundary diffused (GBDed) with PrxTb80–xAl10Ga10 (at%) (x = 0, 20, 40, 60, 80) alloys. The effect of Pr/Tb content in diffusion source on magnetic properties, microstructure and elements distribution of GBDed magnets was investigated. When Pr is used to substitute for 75% Tb in diffusion source, Tb consumption per unit coercivity improvement of GBDed magnet reduces by 77%, compared with the Tb80Al10Ga10 diffused magnet. Tb element diffuses into magnets and then forms Tb-rich shell with high magneto-crystalline anisotropy field surrounding main phase grains, resulting in substantial coercivity improvement. Pr with low melting point diffuses deeply along liquid grain boundary phase during GBD process. It can eliminate some sharp defects of main phase grains and make grain boundaries smooth, which provides diffusion channels for further diffusion of Tb element. Therefore, there are more diffusion channels for Tb and less Tb enriched at surface region, making Tb diffuse more deeply and improving Tb utilization efficiency. This method significantly improves the coercivity, and realizes the green, efficient and high-quality utilization of heavy rare earth (HRE) elements.

In the present report, a series of orange-red light emitting Ca2MgSi2O7:Sm3+ nanopowders was fabricated via low-cost eco-friendly green combustion technique using the Aloe vera gel as the fuel. The phase purity of the samples was confirmed by the powder X-ray diffraction (PXRD) technique. Pure single-phase tetragonal structure is observed from the PXRD results with no additional impurity peaks. The band gap energy of the fabricated powders was estimated by diffuse reflectance spectra (DRS) and is found to be in the range of 4.01–5.98 eV. A high resolution scanning electron microscope (SEM) was used to study the morphological behaviour of the samples. Honeycomb-like structures are observed from the SEM results. The particle size was evaluated by transmission electron microscopy (TEM) and is found to be ∼50 nm. The interplanar distance is found to be 0.53 nm. Photoluminescence properties were systematically studied in detail. The phosphors are successfully excited at 403 nm NUV light, producing reddish-orange characteristic emission. The emission peaks are centered at 558 (4G5/2 → 6H5/2), 607 (4G5/2 → 6H7/2) and 645 nm (4G5/2 → 6H9/2), respectively. Among the observed peaks the red emanation (4G5/2 → 6H7/2) is stronger than the orange emission (4G5/2 → 6H5/2) in the current investigation. The photoluminescent concentration quenching is noticed above 5 mol% Sm3+ ion doping content. The dipole–dipole interaction resulting in cross relaxation is found to be the principal cause of concentration quenching mechanism. The color features such as Commission Internationale de l’Eclairage (CIE) and correlated color temperature (CCT) were studied in detail. The optimized chromaticity coordinates were estimated to be (0.6363, 0.3632), which fall in the reddish-orange region. The average CCT value obtained is 3362 K. The average color purity is found to be ∼82%. Sm3+ incorporated Ca2MgSi2O7 samples are possible contender for single white light generation commercial candidates owing to their strong hypersensitivity of Sm3+ ions through host, least possibility for re-absorption of blue-green emission owing to poor direct f–f excitation of Sm3+ ions, and high color purity (reddish-orange emission). The prepared powders exhibit excellent electrochemical redox properties and CPE modified optimized powders show outstanding sensitive response which indicates its use in the potential electrochemical sensor materials for drug sensing studies.

The loss of rare earths (REs) takes place during the pre-decalcification process of mixed rare earth concentrate. In an effort to reduce such RE loss, a novel idea to improve the leaching selectivity of Ca to REs by applying selective mechanical activation was proposed. First, regarding the key minerals affecting the leaching selectivity of Ca to REs, the differences in the mechanical activation behaviors of CaF2 and REFCO3 were studied, and we find that the lattice strain of CaF2 increases from 0.21% to 0.42%, whereas that of REFCO3 increases from 0.31% to 0.40%. Notably, CaF2 demonstrates a larger lattice strain than REFCO3, indicating greater mechanical activation energy storage and higher leaching activity. Next, the HCl leaching process was studied. A significant leaching selectivity of Ca to REs, from 21.6 to 35.1, is achieved through mechanical activation. The Ca leaching rate reaches 80.7% when the RE loss is 2.3% in the activated sample. This study provides an novel approach for achieving selective extraction of specific components via mechanical activation pretreatment.

The research of poly(ethylene oxide) (PEO)-based solid composite electrolyte with high ionic conductivity and excellent interfacial stability is the key to the development of all-solid-state lithium-ion batteries (ASSLIBs). Herein, uniform nanorod structured CeO2 fillers were controllably synthesized by electrospinning, which were subsequently filled into PEO polymer to prepare CeO2/PEO solid composite electrolyte. The addition of CeO2 nanorods can reduce both the glass transition temperature and the melting point of PEO polymer, and also interact with PEO and lithium bis(trifluoromethanesulphonyl)imide (LITFSI) by Lewis acid–base reaction. Therefore, the solid composite electrolyte exhibits a high ionic conductivity of 4.52 × 10−4 S/cm, a wide electrochemical stability window of about 4.8 V, and a good interfacial stability with Li at 55 °C. Moreover, the LiFePO4/Li ASSLIB divulges the discharging specific capacity of 165, 162, 156 and 146 mA h/g at 0.2, 0.5, 1 and 2 C, respectively, and achieves the capacity retention of 90.3% after 150 cycles at 0.5 C. Consequently, one dimensional CeO2 nanorods can be considered as an alternative filler for polymeric solid electrolyte.

Red phosphor is an important component of the phosphor-converted white light-emitting diodes (pc-WLEDs). The development of the novel red phosphor with excellent luminescence properties is of great significance for high performance WLEDs. In this study, NaGd0.4Eu0.6Mg1–xZnxWO6 red phosphors with excellent luminescence properties were successfully synthesized and systematically investigated. Our results show that the Zn2+-doping concentration has significant effect on the microstructures and luminescence properties of the NaGd0.4Eu0.6Mg1–xZnxWO6 phosphors. The NaGd0.4Eu0.6Mg1–xZnxWO6 (0 ≤ x ≤ 0.7) samples are well crystallized pure solid solution sub-microcrystals, whereas the phase purity gradually decreases at 0.7 < x ≤ 1.0. The NaGd0.4Eu0.6Mg1–xZnxWO6 (0 < x ≤ 0.5) phosphors have stronger emissions than NaGd0.4Eu0.6MgWO6, and the optimized NaGd0.4Eu0.6Mg0.9Zn0.1WO6 phosphor possesses the best luminescence properties including thermal stability, CIE chromaticity coordinate, life time and quantum yield. The packaged WLED using NaGd0.4Eu0.6Mg0.9Zn0.1WO6 phosphor emits bright white light with higher CRI, lower CCT, and chromaticity coordinate close to the pure white light. The developed NaGd0.4Eu0.6Mg1–xZnxWO6 phosphors have potential application in lighting and display. This work can offer an effective strategy for boosting luminescence properties of tungstate phosphors with the double perovskite structure.

Two novel phosphors LiBa4(1‒x)Eu4xTa3O12 (H-LBTO:xEu3+) and Li0.25Ba1‒xEuxTa0.75O3 (C-LBTO:xEu3+) were prepared successfully by a molten salt method. The transformation between these two structures was realized by changing the sintering temperature or changing the Eu3+ ions concentration, which was also demonstrated by the X-ray diffraction (XRD), scanning electron microscopy (SEM), diffuse reflectance spectra (DRS), and photoluminescence excitation (PLE) analyses. Both the sintering temperature and the Eu3+ ions doping concentration have significant impact on the formation of the crystal phase. All these phosphors sintered at 1023 K exhibit two major luminescence lines at 594 and 614 nm under near-UV light of 395 nm excitation, corresponding to Eu3+ ions typical transitions of 5D0→7F1 and 5D0→7F2. The optimum concentration of Eu3+ ions is 9 mol% for C-LBTO:xEu3+ samples and the quenching interaction type is the nearest-neighbor ion interaction. The thermal stability of the C-LBTO:0.09Eu3+ sample was investigated in detail and the device application further suggests that C-LBTO:0.09Eu3+ can be used as a red phosphor for near-UV excited w-LEDs in lighting.

Hot-extrusion and cold-rolling were conducted on Mg–Ce binary alloys to explore the effect of cerium (Ce) on microstructure, texture and mechanical properties of Mg alloys. The addition of Ce results in significant grain refinement both in as-cast and hot-extruded samples. The basal texture is also weakened after extrusion and an inclined basal texture is formed with Ce addition. The strength and elongation of the Mg–Ce alloys are improved simultaneously due to such grain refinement and texture weakening effect. After cold-rolling, plenty of twins are found in the pure Mg and AZ31 plates while grains in the Mg-0.3Ce plate deform more uniformly without lamellar twin structure. Furthermore, Mg-0.3Ce alloys own strong and continuous strain hardening because Ce atoms and Mg–Ce precipitated phases serve as obstacles for dislocation slip.

On account of the complicated magnetic exchange interactions between lanthanide ions, binuclear lanthanide complexes have broad application prospect in the field of single-molecule magnets. Therefore, it is necessary to develop reasonable bridging ligands to manipulate the directional assembly of binuclear lanthanide complexes. Herein, we selected the macrocyclic ligand LN8O2 to build up two new dilanthanide complexes [Ln2(LN8O2)(OpyO)2(H2O)2](NO3)2 (1-Ln, Ln = Dy, Tb; LN8O2 = hexamethyl-tetraaza-dioxe-dipyrazolacycloicosaphane-2,9,12,19-tetraene; OpyOH = 2-pyridinol-1-oxide). Dynamic magnetic studies show that 1-Dy exhibits slow relaxation behavior under a 1 kOe applied field. Further fitting analysis of relaxation times gives the effective energy barrier of 38.2 cm−1, and reveals that the slow magnetic relaxation behavior is dominated by the Orbach and Raman processes. High-resolution luminescence emission spectrum indicates the energy gap of 36.8 cm−1 between the ground state and the first excited state, consistent with the magnetic measurement results. 1-Tb exhibits brilliant characteristic green light emission under UV light excitation. The absolute quantum yield of 1-Tb is 44.8%, and its first-order fitted decay lifetime is 779.21 μs at room temperature. This study provides the way for directional construction of high-performance molecular materials with magnetic and optical dual-function.

The doping of the spinel ferrites with selective cations usually improves the properties of the parent ferrite. The effect of Co2+/Gd3+ co-substitution on the microstructure, optical, and magnetic properties of Cu1–xCoxFe2–xGdxO4 prepared by the citrate-nitrate auto-combustion synthesis was investigated. Characterization of the samples was performed with powder X-ray diffraction (XRD), Raman and Fourier-transform infrared (FTIR) spectroscopy, field-emission scanning electron microscopy, X-ray energy-dispersive spectroscopy, UV–Vis spectroscopy, and a vibrating sample magnetometer. The results of XRD, Raman, and FTIR analysis show a gradual structural phase transition from a tetragonal (I41/amd) structure to a cubic (Fd 3¯ m) structure. The bandgap energy of the studied samples is in a range of 1.57–1.75 eV with a minimum in sample x = 0.06 and then increases. Magnetic investigations show that the presence of Co2+/Gd3+ cations in an octahedral site of the copper ferrite structure could increase saturation magnetization and coercive field from 567.9 Oe and 23.62 emu/g to 929.4 Oe and 28.27 emu/g, respectively.

The thermogravimetric analysis (TGA) experiments were carried out to reveal the mechanism of Zr and Mn doping on catalytic activity of CeO2 catalyst both fresh and after hydrothermal aging, and the lattice morphology and valence changes were characterized by means of Brunauer–Emmett–Teller (BET) method, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and H2-temperature programmed reduction (H2-TPR). Density functional theory (DFT) and molecular thermodynamics calculations were applied to investigate the change in catalytic activity, crystal surface energy and crystal morphology caused by hydrothermal aging. The maximum reaction rate temperature of fresh Mn/CeO2 (389 °C) is similar to that of CeO2 (371 °C) and lower than that of Zr/CeO2 (447 °C), but the catalytic performance of CeO2 decreases more severely after hydrothermal aging. The catalyst crystals show different degrees of crystal surface migration after hydrothermal aging, which leads to the reduction of Ce3+/Ce4+ ratio and the active sites shift. DFT calculations indicate that the doping of Zr and Mn reduces the surface energy of the low Miller indices surface and increases the oxygen vacancy formation energy, leading to better thermal stability and lower catalytic activity. The Zr and Mn doping also changes the adsorption energy and Gibbs free energy of H2O, which dominates the migration of (1 1 1) to (1 1 0) and (1 0 0) in the vapor environment. The crystal surface migration mechanism of CeO2 catalysts doped with Zr and Mn induced by H2O molecules at high temperature obtained in this study can provide a valuable addition to the regeneration of CeO2 catalysts in the after-treatment systems of diesel engines.

Bandgap tuning using rare earth metals as dopants in ferrite-based photocatalytic materials has received a lot of interest because the Fermi 4f energy of these metals generates a sub-energy state in the bandgap generated by the overlapping of Fe-3d and O-2p orbitals. Herein, dysprosium-doped cobalt-nickel mixed ferrite (D-CNFO) and its graphene-reinforced composite (D-CNFO@G) were prepared and an ideal photocatalyst material for azo dye mineralization was proposed. A cost-effective combination of wet-chemical and ultrasonication methods was used to prepare the doped and composite samples. Advanced characterization methodologies were used to scrutinize the optical, compositional, structural, morphological, and photocatalytic characteristics of as-prepared materials. The X-ray diffraction analysis identified the spinel phase's (cubic) structure, while the electronic spectroscopy examination confirmed the prepared samples' rod-like morphology. The UV/visible absorbance spectrum shows the higher light harvesting behavior of the G-CNFO@G in the visible region. The mineralization performance of the D-CNFO and D-CNFO@G composites was analyzed using Congo-red (an anionic dye), a well-known azo dye. The D-CNFO@G sample removes Congo-red dye at a rate almost 2.4% faster than the G-CNFO sample. The experiment involving trapping free radicals indicates that hydroxyl radical plays a crucial role in dye degradation. Since the G-CNFO@G catalyst is magnetic and can be isolated easily from the photocatalytic system, it shows an awkward cycle activity of more than 96% after five mineralization tests. The as-prepared D-CNFO@G composite is proved as an excellent option for azo dye mineralization because of the combined impacts of rare earth doping, graphene reinforcement and nanotechnology.

The separation of rare earth elements using diatomite M45 from aqueous solutions was studied. The experimental isotherms for the adsorption of trivalent lanthanum, cerium, and neodymium cations on this adsorbent were quantified under strongly acidic conditions (pH 2) at 298–328 K. The adsorption equilibria of these earth elements were analyzed using two statistical physics models (homogeneous and heterogeneous monolayer models). The results show that the adsorption of these ions implies a multi-ionic mechanism, which is exothermic. Si-containing functional groups are responsible for the adsorption of these rare-earth elements on the diatomite surface. A heterogeneous statistical physics model confirms that two Si-based functional groups participate in the separation of these cations. The calculated adsorption capacities at saturation follow the order: neodymium > cerium > lanthanum. Calculated interaction energies range from 28600 to 40100 J/mol, indicating physical adsorption on diatomite M45. This study demonstrates that diatomite M45 is a promising separation medium that can be used for the recovery of REEs dissolved in aqueous solutions via adsorption.

With the increasing demand for non-contact fluorescence intensity ratio-based optical thermometry, novel phosphor materials with high-efficiency, dual-emitting centers, and differentiable temperature sensitivity are highly desired. In this work, rare earth Eu2+ ions were incorporated into CsCu2I3 microcrystals by solid–state reaction. Under a single UV excitation, the as-synthesized samples exhibit two emissions: 452 nm blue emission from the 5d→4f transition of Eu2+ and 582 nm yellow emission from self-trapped exciton emission of CsCu2I3. The photoluminescence quantum yield reaches to 50%. The dual-band emission of Eu2+-doped CsCu2I3 shows different temperature responses in the range of 260–360 K. Based on fluorescence intensity ratio technology, the maximum absolute sensitivity and relative sensitivity are 0.091 K–1 (at 360 K) and 2.60%/K (at 260 K), respectively. These results suggest that Eu2+-doped CsCu2I3 could be a good candidate for highly sensitive optical thermometer.

The separation of rare earths is difficult due to their similar properties and the complex characteristics of associated vein ores. Complexation-ultrafiltration (CUF) and shear induced orderly dissociation coupling with ultrafiltration (SIODUF) were used to separate metal ions (M, M = La(III), Ce(IV) and Ca(II)) from simulated bastnaesite leaching solution using acidic phosphonic chitosan (aPCS) and rotating disk membrane. Effect of simultaneous removal of metallic ions was investigated by CUF, and suitable conditions were obtained for C/M 10.0 (mass ratio of complexant to metal ions) and pH 5.0. The shear stabilities of aPCS-M complexes were explored at different pH values and the results show that the complexes can dissociate at a certain rotational speed, the critical one. The critical shear rates of aPCS-La, aPCS-Ce and aPCS-Ca complexes at pH 5.0 were calculated as 1.42 × 105, 1.69 × 105 and 9.75 × 104 s−1, respectively. The order of complexes shear stability is aPCS-Ca < aPCS-La < aPCS-Ce. The high selective separation of M and regeneration of aPCS were achieved by SIODUF in the light of the difference of aPCS-M complexes shear stabilities. The separation coefficients βLa/Ce and βCa/La reach 31.2 and 53.9, respectively.

In perovskite EuTiO3, the magnetic characteristics and magnetocaloric effect (MCE) can be flexibly regulated by converting the magnetism from antiferromagnetic to ferromagnetic. In the present work, a series of Eu(Ti,Nb,Mn)O3 compounds, abbreviated as ETNMO for convenience of description, was fabricated and their crystallography, magnetism together with cryogenic magnetocaloric effects were systematically investigated. The crystallographic results demonstrate the cubic perovskite structure for all the compounds, with the space group of Pm3m. Two magnetic phase transitions are observed in these second-order phase transition (SOPT) materials. The joint substitution of elements Mn and Nb can considerably manipulate the magnetic phase transition process and magnetocaloric performance of the ETNMO compounds. As the Mn content increases, gradually widened –ΔSM-T curves are obtained, and two peaks with a broad shoulder are observed in the –ΔSM-T curves for Δμ0H≤0–1 T. Under a field change of 0–5 T, the values of maximum magnetic entropy change (−ΔSmax M) and refrigeration capacity (RC) are evaluated to be 34.7 J/(kg·K) and 364.9 J/kg for EuTi0.8625Nb0.0625Mn0.075O3, 27.8 J/(kg·K) and 367.6 J/kg for EuTi0.8375Nb0.0625Mn0.1O3, 23.2 J/(kg·K) and 369.2 J/kg for EuTi0.8125Nb0.0625Mn0.125O3, 17.1 J/(kg·K) and 357.6 J/kg for EuTi0.7875Nb0.0625Mn0.15O3, respectively. The considerable MCE parameters make the ETNMO compounds potential candidates for cryogenic magnetic refrigeration.

Novel orange-red Sr2GdSbO6:xEu3+ (x = 0, 0.05, 0.1, 0.2, 0.3, 0.4, 0.5 and 0.6) phosphors were successfully prepared by the traditional high-temperature solid-state method. The results of Rietveld refinement, energy dispersive spectroscopy (EDS) spectrum and elemental mapping demonstrate that Eu3+ successfully replaces the Gd3+ sites and distributes uniformly in the particles of phosphors. The luminescence properties of Sr2GdSbO6:Eu3+ phosphors were investigated in detail. The emission spectra of the strongest emission peak is the 5D0→7F1 (593 nm) transition, which can emit orange-red light under 393 nm excitation. When the doping concentration of Eu3+ ions is x = 0.2, the luminescence intensity of the phosphors reaches the highest. The detailed mechanism of concentration quenching is attributed to dipole-dipole interaction. The thermal stability values of Sr2GdSbO6:0.2Eu3+ phosphors are 87%, 82% and 114% under 393, 467 and 527 nm excitations, respectively. The causes of the abnormal thermal quenching under 527 nm excitation were analyzed. Based on the abnormal thermal quenching under 527 nm excitation, the optical thermometry properties of Sr2GdSbO6:0.2Eu3+ phosphors were investigated by fluorescence intensity ratio (FIR) technique, and appreciable relative sensitivity was obtained. The results suggest that Sr2GdSbO6:0.2Eu3+ phosphors can be potentially applied to w-LEDs and optical thermometers.

SmCo based films with excellent intrinsic magnetic properties have promising applications in micro-electro-mechanical system (MEMS). However, due to the complexity of phase composition and uncontrollable crystallization degree of SmCo hard magnetic phase in the film, both the coercivity (Hc) and remanence (Mr) of films are difficult to enhance simultaneously. In this paper, SmCo based films were deposited with a Cr underlayer and capping layer on single crystal Si substrates via magnetron sputtering process. The effects of annealing parameters and Sm/Co atomic ratio on the phase structure and coercivity of films are discussed. By adjusting the Sm/Co atomic ratio from 1:5 to 1:4, Co soft magnetic phase disappears and the single phase SmCo5 is obtained, leading to the increase of coercivity of the films from 30 to 34 kOe. The influence of deposition temperature and Cu doping on magnetic properties of SmCo based films was investigated. When the deposition temperature increases from room temperature to 250 °C, the coercivity will further increase from 34 to 51 kOe. However, a severe kink is observed in the demagnetization curves due to the poor exchanged coupling. An analysis of transmission electron microscopy (TEM) confirms that the average size of non-hard magnetic amorphous phase exceeds the effective exchanged coupling length of SmCo5, which contributes to the decoupling and low remanence ratio. Therefore, doping Cu and applying a post-annealing process can significantly improve the crystallization degree of the films. Both the coercivity and the remanence ratio of the demagnetization curves are greatly enhanced. We propose a plausible strategy to prepare the SmCo based films with high coercivity and remanence ratio by temperature and chemical optimization, which can be utilized in high performed MEMS devices.