Manipulating Exchange Bias in a Van der Waals Ferromagnet. Issue 12 (7th February 2022)

• Record Type: Journal Article
• Authors: Wu, Yingying; Wang, Wei; Pan, Lei; Wang, Kang L.
• Is Part Of: Advanced materials. Volume 34:Issue 12(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-02-07
• Subjects: antiferromagnets -- exchange bias -- heterostructures -- interface coupling -- layered magnets; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adma.202105266
• Languages: English
• ISSNs: 0935-9648

Abstract

Abstract: Spintronics applications of thin‐film magnets require control and design of specific magnetic properties. Exchange bias, originating from the pinning of spins in a ferromagnet by these of an antiferromagnet, is a part of the highly important elements for spintronics applications. Here, an exchange bias of ≈90 mT in a van der Waals ferromagnet encapsulated by two antiferromagnets at 5 K, the value of which is highly tunable by the field coolings, is reported. The non‐antisymmetric dependence of exchange bias on field cooling is explained through considering an uncompensated interfacial magnetic layer of an antiferromagnet with a noncollinear spin texture, and a weak antiferromagnetic order in the oxidized layer, at two ferromagnet/antiferromagnet interfaces. This work opens up new routes toward designing and controlling 2D spintronic devices made of atomically thin van der Waals magnets. Abstract : Two ferromagnet/antiferromagnet interfaces are formed for generating a non‐antisymmetric exchange bias, where ferromagnetic Fe3 GeTe2 is coupled to antiferromagnetic CrSe with a noncollinear spin texture and oxidized Fe3 GeTe2 with a weak antiferromagnetic order. This exchange bias can be manipulated with field coolings, which opens up new routes toward controlling 2D spintronic devices based on van der Waals magnets.