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Title: Anisotropic magnetocaloric effect in Fe 3-xGeTe 2

Abstract

We introduce a comprehensive study on anisotropic magnetocaloric porperties of the van der Waals weak-itinerant ferromagnet Fe 3-xGeTe 2 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 Fe 3-xGeTe 2 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 ₋ΔS$$^{max}_{M}$$ 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 ₋ΔS$$^{max}_{M}$$ and the relative cooling power RCP, it gives ₋ΔS$$^{max}_{M}$$ ∝ H n with n = 0.603(6) and RCP ∝H m with m = 1.20(1) when H//c. Because of the high and tunable T c, Fe 3-xGeTe 2 crystals are of interest for fabricating the heterostructure-based spintronics device.

Authors:
ORCiD logo [1];  [1];  [1];  [1];  [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1571404
Report Number(s):
BNL-212217-2019-JAAM
Journal ID: ISSN 2045-2322
Grant/Contract Number:  
SC0012704
Resource Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 9; Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Liu, Yu, Li, Jun, Tao, Jing, Zhu, Yimei, and Petrovic, Cedomir. Anisotropic magnetocaloric effect in Fe3-xGeTe2. United States: N. p., 2019. Web. doi:10.1038/s41598-019-49654-4.
Liu, Yu, Li, Jun, Tao, Jing, Zhu, Yimei, & Petrovic, Cedomir. Anisotropic magnetocaloric effect in Fe3-xGeTe2. United States. doi:10.1038/s41598-019-49654-4.
Liu, Yu, Li, Jun, Tao, Jing, Zhu, Yimei, and Petrovic, Cedomir. Fri . "Anisotropic magnetocaloric effect in Fe3-xGeTe2". United States. doi:10.1038/s41598-019-49654-4. https://www.osti.gov/servlets/purl/1571404.
@article{osti_1571404,
title = {Anisotropic magnetocaloric effect in Fe3-xGeTe2},
author = {Liu, Yu and Li, Jun and Tao, Jing and Zhu, Yimei and Petrovic, Cedomir},
abstractNote = {We introduce a comprehensive study on anisotropic magnetocaloric porperties of the van der Waals weak-itinerant ferromagnet Fe3-xGeTe2 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-xGeTe2 crsytal. The magnetic entropy change ΔSM also reveals an anisotropic characteristic between H//ab and H//c, which could be well scaled into a universal curve. The peak value ₋ΔS$^{max}_{M}$ of 1.20 J kg₋1 K₋1 and the corresponding adiabatic temperature change ΔTad 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 ₋ΔS$^{max}_{M}$ and the relative cooling power RCP, it gives ₋ΔS$^{max}_{M}$ ∝ Hn with n = 0.603(6) and RCP ∝Hm with m = 1.20(1) when H//c. Because of the high and tunable Tc, Fe3-xGeTe2 crystals are of interest for fabricating the heterostructure-based spintronics device.},
doi = {10.1038/s41598-019-49654-4},
journal = {Scientific Reports},
number = 1,
volume = 9,
place = {United States},
year = {2019},
month = {9}
}

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