Giant Magnetocaloric Effect in Magnets Down to the Monolayer Limit

Weiwei He; Yan Yin; Qihua Gong; Richard F.L. Evans; Oliver Gutfleisch; Bai Xiang Xu; Min Yi; Wanlin Guo

doi:10.1002/smll.202300333

Giant Magnetocaloric Effect in Magnets Down to the Monolayer Limit

Weiwei He, Yan Yin, Qihua Gong^*, Richard F.L. Evans, Oliver Gutfleisch, Bai Xiang Xu, Min Yi^*, Wanlin Guo

^*Corresponding author for this work

Physics

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Article number	2300333
Number of pages	10
Journal	Small
Early online date	7 May 2023
DOIs	https://doi.org/10.1002/smll.202300333
Publication status	E-pub ahead of print - 7 May 2023

Bibliographical note

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

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© 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
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title = "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.",

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author = "Weiwei He and Yan Yin and Qihua Gong and Evans, {Richard F.L.} and Oliver Gutfleisch and Xu, {Bai Xiang} and Min Yi and Wanlin Guo",

note = "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: {\textcopyright} 2023 Wiley-VCH GmbH. This is an author-produced version of the published paper. Uploaded in accordance with the publisher{\textquoteright}s self-archiving policy. Further copying may not be permitted; contact the publisher for details ",

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AU - Gutfleisch, Oliver

AU - Xu, Bai Xiang

AU - Yi, Min

AU - Guo, Wanlin

N1 - 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

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N2 - 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.

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Giant Magnetocaloric Effect in Magnets Down to the Monolayer Limit

Abstract

Bibliographical note

Keywords

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