Electric Field‐Driven Rotation of Magnetic Vortex Originating from Magnetic Anisotropy Reorientation
Electric Field‐Driven Rotation of Magnetic Vortex Originating from Magnetic Anisotropy Reorientation
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DOI：
10.1002/aelm.202100561
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发表时间：
2021-10
影响因子：
6.2
通讯作者：
Yadong Wang;N. Mehmood;Z. Hou;W. Mi;Guofu Zhou;Xingsen Gao;Jun-ming Liu
中科院分区：
文献类型：
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作者：
Yadong Wang;N. Mehmood;Z. Hou;W. Mi;Guofu Zhou;Xingsen Gao;Jun-ming Liu
磁涡旋是一种磁通闭合自旋结构，由于其纳米尺寸和奇异的磁电输运特性，在未来的高密度，低功耗磁存储器中显示出潜力。虽然磁涡旋可以通过各种外部刺激以可控的方式操纵，但电场诱导的磁涡旋的非易失性和确定性反转尚未在实验上建立。在本工作中，基于外延的γ ′-Fe 4 N/0. 7 PbMg 1/3 Nb 2/3 O3 - 0. 3 PbTiO 3多铁性异质结构，实现了电场诱导的磁涡旋的确定性可逆旋转.这种旋转是非易失性的，可以由电场脉冲触发。更重要的是，它不需要辅助磁场。结合实验和理论模拟表明，磁涡旋的旋转起源于应变介导的面内磁各向异性的重取向。这些结果为操纵磁涡旋提供了额外的自由度，这可以为构建基于磁涡旋的存储器件打开新的大门。
Magnetic vortex, a flux‐closure spin configuration, has shown potential in future high‐density, low‐power magnetic memories due to their nanoscale size and exotic magneto‐electrical transport properties. Although magnetic vortex can be manipulated by various external stimuli in a controllable way, an electrical field‐induced nonvolatile and deterministic reversal rotation of magnetic vortex is yet to be experimentally established. In this work, electrical field‐induced deterministic reversible rotation of a magnetic vortex is realized based on an epitaxial γ ′‐Fe4N/0.7PbMg1/3Nb2/3O3‐0.3PbTiO3 multiferroic heterostructure. This rotation is nonvolatile and can be triggered by the electric‐field pulse. More importantly, it does not require an assistant magnetic field. Combined experiments and theoretical simulations reveal that the rotation of magnetic vortex originates from the strain‐mediated reorientation of the in‐plane magnetic anisotropy. The results provide an additional degree of freedom for manipulating magnetic vortex, which can open new doors for constructing magnetic vortex‐based memory devices.