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正交扭曲铁磁单层中的多步磁化切换

Multistep magnetization switching in orthogonally twisted ferromagnetic monolayers.

作者信息

Boix-Constant Carla, Jenkins Sarah, Rama-Eiroa Ricardo, Santos Elton J G, Mañas-Valero Samuel, Coronado Eugenio

机构信息

Instituto de Ciencia Molecular (ICMol) - Universitat de València, Paterna, Spain.

Institute for Condensed Matter Physics and Complex Systems, School of Physics and Astronomy, The University of Edinburgh, Edinburgh, UK.

出版信息

Nat Mater. 2024 Feb;23(2):212-218. doi: 10.1038/s41563-023-01735-6. Epub 2023 Nov 30.

Abstract

The advent of twist engineering in two-dimensional crystals enables the design of van der Waals heterostructures with emergent properties. In the case of magnets, this approach can afford artificial antiferromagnets with tailored spin arrangements. Here we fabricate an orthogonally twisted bilayer by twisting two CrSBr ferromagnetic monolayers with an easy-axis in-plane spin anisotropy by 90°. The magnetotransport properties reveal multistep magnetization switching with a magnetic hysteresis opening, which is absent in the pristine case. By tuning the magnetic field, we modulate the remanent state and coercivity and select between hysteretic and non-hysteretic magnetoresistance scenarios. This complexity pinpoints spin anisotropy as a key aspect in twisted magnetic superlattices. Our results highlight control over the magnetic properties in van der Waals heterostructures, leading to a variety of field-induced phenomena and opening a fruitful playground for creating desired magnetic symmetries and manipulating non-collinear magnetic configurations.

摘要

二维晶体中扭曲工程的出现使得具有新兴特性的范德华异质结构的设计成为可能。对于磁体而言,这种方法能够制造出自旋排列定制的人工反铁磁体。在此,我们通过将两个具有易轴面内自旋各向异性的CrSBr铁磁单层以90°扭转,制备出了一个正交扭曲双层。磁输运特性揭示了具有磁滞开口的多步磁化翻转,这在原始情况下并不存在。通过调节磁场,我们可以调制剩余状态和矫顽力,并在磁滞和非磁滞磁阻情形之间进行选择。这种复杂性将自旋各向异性确定为扭曲磁性超晶格中的一个关键方面。我们的结果突出了对范德华异质结构中磁性的控制,从而导致了各种场致现象,并为创造所需的磁对称性和操纵非共线磁构型开辟了一个富有成果的领域。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/be82/10837074/c681d3080bd7/41563_2023_1735_Fig1_HTML.jpg

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