Electric current control of spin helicity in an itinerant helimagnet
Electric current control of spin helicity in an itinerant helimagnet
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DOI：
10.1038/s41467-020-15380-z
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发表时间：
2020-03-30
影响因子：
16.6
通讯作者：
Onose, Y.
中科院分区：
文献类型：
--
作者：
Jiang, N.;Nii, Y.;Onose, Y.
旋磁体是一种手性磁体，其中磁矩方向在垂直于传播矢量的平面内空间旋转。被称为自旋螺旋度的旋转方向是物质的强大自由度，如果可以电控制和检测，则可以提供磁记忆的新概念。在这里，我们证明螺旋度可以通过流动螺旋磁体 MnP 中的磁场和电流来控制。二次谐波电阻率测量使我们能够读出受控的螺旋度。与绝缘多铁磁体相比，其中自旋旋转可通过电场控制，我们通过在导电螺旋磁体中使用电流来实现螺旋度操纵。自旋螺旋度的可控性可能为基于自旋内部自由度实现磁存储器的新方法铺平道路。
A helimagnet is a chiral magnet in which the direction of the magnetic moment spatially rotates in a plane perpendicular to the propagation vector. The sense of the rotation known as spin helicity is a robust degree of freedom of matter and may provide a new concept of magnetic memory if it can be electrically controlled and detected. Here we show that the helicity can be controlled by magnetic fields and electric currents in an itinerant helimagnet MnP. Second-harmonic resistivity measurements allow us to read out the controlled helicity. In contract to an insulating multiferroic magnet, in which spin rotation was shown to be controllable by an electric field, we achieve helicity manipulation by using an electric current in the conducting helimagnet. The controllability of the spin helicity may pave the way to new method of realizing magnetic memories based on the spin internal degrees of freedom.