Theoretical study on magnetocaloric effect and its electric-field regulation in CrI_(3)/metal heterostructure  

作　　者：Weiwei He Ziming Tang Qihua Gong Min Yi Wanlin Guo 

机构地区：[1]State Key Laboratory of Mechanics and Control for Aerospace Structures,Key Laboratory for Intelligent Nano Materials and Devices of Ministry of Education,Institute for Frontier Science,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China [2]MIIT Key Laboratory of Aerospace Information Materials and Physics,College of Physics,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2024年第2期134-141,共8页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.12272173,12302134,and 11902150);the Fundamental Research Funds for the Central Universities(Grant No.NS2023054);the National Overseas Youth Talents Program;the Research Fund of State Key Laboratory of Mechanics and Control for Aerospace Structures(Grant Nos.MCMS-I-0419G01,and MCMS-I-0421K01);the Priority Academic Program Development of Jiangsu Higher Education Institutions;the Interdisciplinary Innovation Fund for Doctoral Students of Nanjing University of Aeronautics and Astronautics(Grant No.KXKCXJJ202306);partially supported by the High Performance Computing Platform of Nanjing University of Aeronautics and Astronautics。

摘　　要：The extraordinary properties of a heterostructure by stacking atom-thick van der Waals(vdW)magnets have been extensively studied.However,the magnetocaloric effect(MCE)of heterostructures that are based on monolayer magnets remains to be explored.Herein,we deliberate MCE of vd W heterostructure composed of a monolayer CrI_(3)and metal atomic layers(Ag,Hf,Au,and Pb).It is revealed that heterostructure engineering by introducing metal substrate can improve MCE of CrI_(3),particularly boosting relative cooling power to 471.72μJ m^(-2)and adiabatic temperature change to 2.1 K at 5 T for CrI_(3)/Hf.This improved MCE is ascribed to the enhancement of magnetic moment and intralayer exchange coupling in CrI_(3)due to the CrI_(3)/metal heterointerface induced charge transfer.Electric field is further found to tune MCE of CrI_(3)in heterostructures and could shift the peak temperature by around 10 K in CrI_(3)/Hf,thus manipulating the working temperature window of MCE.These theoretical results could enrich the research on low-dimensional magnetocaloric materials.

关 键 词：magnetocaloric effect HETEROSTRUCTURE metal substrate 

分 类 号：O469[理学—凝聚态物理]