The Magnetic Properties and Magnetocaloric Effect of Pr0.7Sr0.3MnO3 Thin Film Grown on SrTiO3 Substrate

Abstract

The magnetic behaviors and magnetocaloric effect (MCE) of Pr0.7Sr0.3MnO3 (PSMO-7) film grown on a (001) SrTiO3 single-crystal substrate by a pulsed laser deposition (PLD) were studied in this paper. X-ray diffraction with a high resolution (HRXRD) measurement shows that PSMO-7 film is grown with a (001) single orientation. The magnetic properties and the MCE related to the ferromagnetic (FM) phase transition of the PSMO-7 film are investigated using the temperature dependence of magnetization M(T) and the magnetic field dependence of magnetization M(H). The M(T) data suggest that with decreasing temperatures, the PSMO-7 film goes through the transition from the paramagnetic (PM) state to the FM state at around the Curie temperature (TC). The TC (about 193 K) can be obtained by the linear fit of the Curie law. Magnetic hysteresis loop measurements show that the PSMO-7 film exhibits the FM feature at temperatures of 10, 100, and 150 K (low magnetic hysteresis can be found), while the film reveals the PM feature with the temperature increased up to 200 and/or 300 K. The research results of M(H) data are consistent with the M(T) data. Furthermore, the magnetic entropy change () of the PSMO-7 film was studied. It was found that the maximum value of () near TC reaches about 4.7 J/kg·K under the applied field change of 20 kOe, which is comparable to that of metal Gd ( of 2.8 J/kg K under 10 kOe), indicating the potential applications of PSMO-7 film in the field of magnetic refrigeration.

Effects of Substitution and Substrate Strain on the Structure and Properties of Orthorhombic Eu1−xYxMnO3 (0 ≤ x ≤ 0.5) Thin Films

“…In this case, the film-substrate interface may emulate an apparently emergent FM response caused by pinning local magnetic moments induced by the excitation magnetic field [ 38 ]. This weak FM character, prolonging above 100 K, hinders the application of a Curie-Weiss model [ 6 ]. The previous results agree with those reported in Lu-doped EuMnO 3 thin films [ 17 , 39 ]; however, irreversibility behavior seems more marked in these samples.…”

“…Rare-earth manganites R MnO 3 are among some of the most relevant functional oxide materials, mainly due to intrinsic strong correlated electron mechanisms, leading to exhibiting structural-orbital-magnetic-electric coupling effects. In particular, it can be used for barriers and interfaces in controlled spin transport devices [ 1 , 2 , 3 , 4 , 5 , 6 ]. According to the ionic radius of rare earth elements, the manganites can exhibit two main distinct structural symmetries.…”

“…These effects are under study on other strained perovskite thin films, which in bulk form exhibit orthorhombic structures: EuMnO 3 , GdMnO 3 , LaMnO 3 , DyMnO 3 , YMnO 3 , etc. [ 6 , 27 ]. From this perspective, the main objective of this work is to analyze and determine the effects of Y substitution of Eu and substrate strain on the structural and magnetic properties of orthorhombic Eu 1− x Y x MnO 3 thin films and, in particular, thin film oxides prepared by the sol-gel spin-coating method, taking into consideration some practical technical factors, including low production cost, equipment versatility, simplicity of preparation, composition control, and low sintering temperature.…”

Magnetic and Transport Anomalies and Large Magnetocaloric Effect in Cubic R4PtAl (R = Ho and Er)

“…We hope these inferences provide clues for the advancement of theories in the field of MCE to enable the engineering of materials for magnetic refrigeration at room temperature (see, for instance, Ref. [31] for a report on thin film route of a manganite to enhance MCE with respect to Gd metal at room temperature). This entropy behavior of the Er compound meets the much-needed [27] characteristic of "reversibility" for magnetocaloric applications in the low temperature range.…”

Characterisations of La-Sr-Mn-O (LSMO) Thin Film Fabricated by RF Sputtering

“…Recently, a promising nanostructured LSMO polycrystalline film grown on quartz with greater LFMR (31%), CMR (56%) and sensitivity (0.28 V/T at B = 0.25 T) was fabricated and suggested by Stankevic et al for CMR sensors [2]. Bojun et al reported the fabrication of PSMO films, growing on SrTiO 3 films, with the potential for magnetic refrigeration application [15]. However, such studies with LSMO deposition on corning glass (CG) were halted after 2014 due to their amorphous natures [7,16,17].…”