Ferrimagnetic insulators (FiMI) have been intensively used in microwave and magneto-optical devices as well as spin caloritronics, where their magnetization direction plays a fundamental role on the device performance. The magnetization is generally switched by applying external magnetic fields. Here we investigate current-induced spin-orbit-torque switching of the magnetization in ${\mathrm{Y}}_3{\mathrm{Fe}}_5{\mathrm{O}}_{12}$ ($\mathrm{YIG}$)/$\mathrm{Pt}$ bilayers with in-plane magnetic anisotropy, where the switching is detected by spin Hall magnetoresistance. Reversible switching is found at room temperature for a threshold current density of ${10}^7\mathrm{A}{\mathrm{cm}}^{-2}$. The $\mathrm{YIG}$ sublattices with antiparallel and unequal magnetic moments are aligned parallel or antiparallel to the direction of current pulses, which is consistent to the Néel-order switching in an antiferromagnetic system. It is proposed that such a switching behavior may be triggered by the antidamping torque acting on the two antiparallel sublattices of FiMI. Our finding not only broadens the magnetization switching by electrical means and promotes the understanding of magnetization switching, but also paves the way for all-electrically modulated microwave devices and spin caloritronics with low power consumption.

中文翻译：

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双轴亚铁磁绝缘子中的电流感应面内磁化开关

铁磁绝缘体（FiMI）已广泛用于微波和磁光设备以及自旋量热电子学中，其磁化方向对设备性能起着至关重要的作用。通常通过施加外部磁场来切换磁化强度。在这里，我们研究了电流引起的自旋轨道转矩转换${\mathrm{ÿ}}_3{铁}_5{\mathrm{Ø}}_{12}$ （$\mathrm{伊格}$）/$铂$平面内具有各向异性的双分子层，其中通过自旋霍尔磁阻检测开关。在室温下发现可逆开关的阈值电流密度为${10}^7\mathrm{一种}{\mathrm{厘米}}^{-2}$。的$\mathrm{伊格}$具有反平行和不相等磁矩的子晶格平行于或反平行于电流脉冲的方向排列，这与反铁磁系统中的Néel阶转换一致。提出可以通过作用在FiMI的两个反平行子格上的反阻尼转矩来触发这种切换行为。我们的发现不仅拓宽了通过电气手段进行磁化切换的范围，并增进了对磁化切换的理解，而且为全电调制微波设备和低功耗自旋热电子器件铺平了道路。