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Emergence of electric-field-tunable interfacial ferromagnetism in 2D antiferromagnet heterostructures
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Emergence of electric-field-tunable interfacial ferromagnetism in 2D antiferromagnet heterostructures
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Journal Article
Emergence of electric-field-tunable interfacial ferromagnetism in 2D antiferromagnet heterostructures
2022
Overview
Van der Waals (vdW) magnet heterostructures have emerged as new platforms to explore exotic magnetic orders and quantum phenomena. Here, we study heterostructures of layered antiferromagnets, CrI
3
and CrCl
3
, with perpendicular and in-plane magnetic anisotropy, respectively. Using magneto-optical Kerr effect microscopy, we demonstrate out-of-plane magnetic order in the CrCl
3
layer proximal to CrI
3
, with ferromagnetic interfacial coupling between the two. Such an interlayer exchange field leads to higher critical temperature than that of either CrI
3
or CrCl
3
alone. We further demonstrate significant electric-field control of the coercivity, attributed to the naturally broken structural inversion symmetry of the heterostructure allowing unprecedented direct coupling between electric field and interfacial magnetism. These findings illustrate the opportunity to explore exotic magnetic phases and engineer spintronic devices in vdW heterostructures.
One particularly useful feature of van der Waals materials is the ability to combine layers of different materials into a single heterostructure, which can have superior properties than any of the constituent materials alone. Here, Cheng et al. combine two interlayer-antiferromagnetic chromium trihalides, CrI
3
and CrCl
3
in close proximity, and demonstrate ferromagnetic coupling between them.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
