Giant Magnetocaloric Effect in Magnets Down to the Monolayer Limit

Abstract

2D magnets can potentially revolutionize information technology, but their potential application to cooling technology and magnetocaloric effect (MCE) in a material down to the monolayer limit remain unexplored. Herein, it is revealed through multiscale calculations the existence of giant MCE and its strain tunability in monolayer magnets such as CrX3 (X = F, Cl, Br, I), CrAX (A = O, S, Se; X = F, Cl, Br, I), and Fe3GeTe2. The maximum adiabatic temperature change ((Formula presented.)), maximum isothermal magnetic entropy change, and specific cooling power in monolayer CrF3 are found as high as 11 K, 35 µJ m−2 K−1, and 3.5 nW cm−2 under a magnetic field of 5 T, respectively. A 2% biaxial and 5% a-axis uniaxial compressive strain can remarkably increase (Formula presented.) of CrCl3 and CrOF by 230% and 37% (up to 15.3 and 6.0 K), respectively. It is found that large net magnetic moment per unit area favors improved MCE. These findings advocate the giant-MCE monolayer magnets, opening new opportunities for magnetic cooling at nanoscale.

Metadata

Item Type:	Article
Authors/Creators:	He, Weiwei Yin, Yan Gong, Qihua Evans, Richard F.L. https://orcid.org/0000-0002-2378-8203 Gutfleisch, Oliver Xu, Bai Xiang Yi, Min Guo, Wanlin
Copyright, Publisher and Additional Information:	Funding Information: The authors acknowledge the support from the National Natural Science Foundation of China (12272173 and 11902150), the National Overseas Youth Talents Program, the Research Fund of State Key Laboratory of Mechanics and Control for Aerospace Structures (MCMS‐I‐0419G01 and MCMS‐I‐0421K01), the Fundamental Research Funds for the Central Universities (1001‐XAC21021), a project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions, the European Research Council (ERC) under the European Unions Horizon 2020 research and innovation programme (no. 743116), the German Research Foundation (DFG YI 165/1‐1 and DFG XU 121/7‐1), and the Interdisciplinary Innovation Fund for Doctoral Students of Nanjing University of Aeronautics and Astronautics (KXKCXJJ202306). This work was partially supported by High Performance Computing Platform of Nanjing University of Aeronautics and Astronautics. Simulations were also performed on Hefei advanced computing center. Publisher Copyright: © 2023 Wiley-VCH GmbH. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details
Keywords:	2D magnets,adiabatic temperature change,isothermal magnetic entropy change,specific cooling power,strain tunability
Dates:	Published (online): 7 May 2023 Accepted: 30 March 2023 Submitted: 11 January 2023
Institution:	The University of York
Academic Units:	The University of York > Faculty of Sciences (York) > Physics (York)
Depositing User:	Pure (York)
Date Deposited:	22 Jun 2023 09:10
Last Modified:	17 Oct 2024 08:53
Published Version:	https://doi.org/10.1002/smll.202300333
Status:	Published online
Refereed:	Yes
Identification Number:	10.1002/smll.202300333
Related URLs:	http://www.scopus.com/inward/record.url?...
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:200698

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Giant Magnetocaloric Effect in Magnets Down to the Monolayer Limit

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