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.
Bibliographical noteFunding 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.
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- 2D magnets
- adiabatic temperature change
- isothermal magnetic entropy change
- specific cooling power
- strain tunability