Anisotropic magnetocaloric effect in Fe3−x GeTe2
Abstract We present a comprehensive study on anisotropic magnetocaloric porperties of the van der Waals weak-itinerant ferromagnet Fe3−x GeTe2 that features gate-tunable room-temperature ferromagnetism in few-layer device. Intrinsic magnetocrystalline anisotropy is observed to be temperature-depende...
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| Autores principales: | , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
Nature Portfolio
2019
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/0fd4ca7b33184ecab4653e3f6a2dd9b6 |
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| Sumario: | Abstract We present a comprehensive study on anisotropic magnetocaloric porperties of the van der Waals weak-itinerant ferromagnet Fe3−x GeTe2 that features gate-tunable room-temperature ferromagnetism in few-layer device. Intrinsic magnetocrystalline anisotropy is observed to be temperature-dependent and most likely favors the long-range magnetic order in thin Fe3−x GeTe2 crsytal. The magnetic entropy change ΔS M also reveals an anisotropic characteristic between H//ab and H//c, which could be well scaled into a universal curve. The peak value $$-\Delta {S}_{M}^{{\max }}$$ −ΔSMmax of 1.20 J kg−1 K−1 and the corresponding adiabatic temperature change ΔT ad of 0.66 K are deduced from heat capacity with out-of-plane field change of 5 T. By fitting of the field-dependent parameters of $$-\Delta {S}_{M}^{{\max }}$$ −ΔSMmax and the relative cooling power RCP, it gives $$-{\rm{\triangle }}{S}_{M}^{{\max }}$$ −∆SMmax ∝ H n with n = 0.603(6) and RCP ∝ H m with m = 1.20(1) when H//c. Given the high and tunable T c , Fe3−x GeTe2 crystals are of interest for fabricating the heterostructure-based spintronics device. |
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