Dzyaloshinskii-Moriya Interaction across an Antiferromagnet-Ferromagnet Interface
Dzyaloshinskii-Moriya Interaction across an Antiferromagnet-Ferromagnet Interface
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DOI：
10.1103/physrevlett.119.027202
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发表时间：
2017-07-14
影响因子：
8.6
通讯作者：
Li, Xiaoqin
中科院分区：
文献类型：
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作者：
Ma, Xin;Yu, Guoqiang;Li, Xiaoqin
反铁磁体-铁磁体（AFM-FM）界面在最近开发的FM自旋的纯电或超快控制中具有核心重要性，其中潜在的机制仍然没有得到解决。在这里，我们报告了在IrMn/ CoFeB薄膜的AFM-FM界面上直接观察到的Dzyaloshinskiii-Moriya相互作用（DMI）。利用布里渊光散射，从FM层中的非对称自旋波色散定量测量了界面散射。在1-7.5 nm范围内，随着IrMn层厚度的增加，薄膜的抗弯强度提高了7倍。我们的研究结果提供了更深入的了解耦合在AFM-FM接口，并可能刺激新的设备概念，利用手性自旋纹理，如磁Skyrmions在AFM-FM异质结构。
The antiferromagnet-(AFM-) ferromagnet (FM) interfaces are of central importance in recently developed pure electric or ultrafast control of FM spins, where the underlying mechanisms remain unresolved. Here we report the direct observation of an Dzyaloshinskii-Moriya interaction (DMI) across the AFM-FMinterface of IrMn/ CoFeB thin films. The interfacial DMI is quantitatively measured from the asymmetric spin-wave dispersion in the FM layer using Brillouin light scattering. The DMI strength is enhanced by a factor of 7 with increasing IrMn layer thickness in the range of 1-7.5 nm. Our findings provide deeper insight into the coupling at the AFM-FM interface and may stimulate new device concepts utilizing chiral spin textures such as magnetic Skyrmions in AFM-FM heterostructures.