Exchange magnetostriction in two-dimensional antiferromagnets
Exchange magnetostriction in two-dimensional antiferromagnets
复制标题
二维反铁磁体中的交换磁致伸缩
DOI：
10.1038/s41563-020-0712-x
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发表时间：
2020-06-29
期刊：
影响因子：
41.2
通讯作者：
Mak, Kin Fai
中科院分区：
文献类型：
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作者：
Jiang, Shengwei;Xie, Hongchao;Mak, Kin Fai
磁致伸缩是机械自由度和磁自由度之间的耦合，在磁驱动、换能和传感领域有多种应用(1,2)。二维层状磁性材料(3-8)的发现为探索超薄固体磁致伸缩效应提供了一个新平台。在这里，我们演示了由二维反铁磁 CrI3 制成的机械谐振器中的交换驱动磁致伸缩效应。发现机械共振频率取决于材料的磁性状态。我们通过分别测量平行和垂直于易轴的磁场下的共振频率来量化交换和各向异性磁致伸缩的相对重要性。此外，我们还展示了由于逆磁致伸缩对二维 CrI(3) 中内部磁相互作用的有效应变调节。我们的结果为二维层状材料中磁态和磁相变的机械检测和控制奠定了基础。针对少层 CrI3，演示了机械振动和磁性的耦合以及交换相互作用的应变调节。
Magnetostriction, coupling between the mechanical and magnetic degrees of freedom, finds a variety of applications in magnetic actuation, transduction and sensing(1,2). The discovery of two-dimensional layered magnetic materials(3-8)presents a new platform to explore the magnetostriction effects in ultrathin solids. Here we demonstrate an exchange-driven magnetostriction effect in mechanical resonators made of two-dimensional antiferromagnetic CrI3. The mechanical resonance frequency is found to depend on the magnetic state of the material. We quantify the relative importance of the exchange and anisotropy magnetostriction by measuring the resonance frequency under a magnetic field parallel and perpendicular to the easy axis, respectively. Furthermore, we show efficient strain-tuning of the internal magnetic interactions in two-dimensional CrI(3)as a result of inverse magnetostriction. Our results establish the basis for mechanical detection and control of magnetic states and magnetic phase transitions in two-dimensional layered materials.A coupling of mechanical vibrations and magnetism and strain-tuning of the exchange interactions, is demonstrated for few-layer CrI3.