Exchange Bias Modulated by Antiferromagnetic Spin-Flop Transition in 2D Van der Waals Heterostructures

Gu，Kai1; Zhang，Xiaoqian2,3; Liu，Xiangjie1; Guo，Xinlei1; Wu，Zhenqi1; Wang，Shuo1; Song，Qinxin1; Wang，Wei4; Wei，Lujun1; Liu，Ping1; Ma，Jingrui5; Xu，Yongbing1,6; Niu，Wei1,5; Pu，Yong1

2024

10.1002/advs.202307034

Advanced Science   影响因子和分区

2198-3844

Exchange bias is extensively studied and widely utilized in spintronic devices, such as spin valves and magnetic tunnel junctions. 2D van der Waals (vdW) magnets, with high-quality interfaces in heterostructures, provide an excellent platform for investigating the exchange bias effect. To date, intrinsic modulation of exchange bias, for instance, via precise manipulation of the magnetic phases of the antiferromagnetic layer, is yet to be fully reached, owing partly to the large exchange fields of traditional bulk antiferromagnets. Herein, motivated by the low-field spin-flop transition of a 2D antiferromagnet, CrPS, exchange bias is explored by modulating the antiferromagnetic spin-flop phase transition in all-vdW magnetic heterostructures. The results demonstrate that undergoing the spin-flop transition during the field cooling process, the A-type antiferromagnetic ground state of CrPS turns into a canted antiferromagnetic one, therefore, it reduces the interfacial magnetic coupling and suppresses the exchange bias. Via conducting different cooling fields, one can select the exchange bias effect switching among the “ON”, “depressed”, and “OFF” states determined by the spin flop of CrPS. This work provides an approach to intrinsically modulate the exchange bias in all-vdW heterostructures and paves new avenues to design and manipulate 2D spintronic devices.

2D magnet exchange bias spin-flop transition van der Waals heterostructure

SCI ; EI

英语

通讯

2-s2.0-85184690023

Scopus

1.New Energy Technology Engineering Laboratory of Jiangsu Province & School of Science,Nanjing University of Posts and Telecommunications,Nanjing,210023,China
2.Key Laboratory of Quantum Materials and Devices of Ministry of Education,School of Physics,Southeast University,Nanjing,211189,China
3.International Quantum Academy,Shenzhen,518048,China
4.Key Laboratory of Flexible Electronics & Institute of Advanced Materials,Jiangsu National Synergetic Innovation Center for Advanced Materials,Nanjing Tech University,Nanjing,211816,China
5.Key Laboratory of Energy Conversion and Storage Technologies,Southern University of Science and Technology,Shenzhen,518055,China
6.School of Electronic Science and Engineering,Nanjing University,Nanjing,210023,China

Gu，Kai,Zhang，Xiaoqian,Liu，Xiangjie,et al. Exchange Bias Modulated by Antiferromagnetic Spin-Flop Transition in 2D Van der Waals Heterostructures[J]. Advanced Science,2024,11(17).

Gu，Kai.,Zhang，Xiaoqian.,Liu，Xiangjie.,Guo，Xinlei.,Wu，Zhenqi.,...&Pu，Yong.(2024).Exchange Bias Modulated by Antiferromagnetic Spin-Flop Transition in 2D Van der Waals Heterostructures.Advanced Science,11(17).

Gu，Kai,et al."Exchange Bias Modulated by Antiferromagnetic Spin-Flop Transition in 2D Van der Waals Heterostructures".Advanced Science 11.17(2024).