Electrical nucleation, displacement, and detection of antiferromagnetic domain walls in the chiral antiferromagnet Mn3Sn
Electrical nucleation, displacement, and detection of antiferromagnetic domain walls in the chiral antiferromagnet Mn3Sn
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DOI：
10.1038/s42005-020-0381-8
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发表时间：
2020-06
影响因子：
5.5
通讯作者：
S. Sugimoto;Y. Nakatani;Y. Yamane;M. Ikhlas;K. Kondou;M. Kimata;T. Tomita;S. Nakatsuji;Y. Otani
中科院分区：
文献类型：
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作者：
S. Sugimoto;Y. Nakatani;Y. Yamane;M. Ikhlas;K. Kondou;M. Kimata;T. Tomita;S. Nakatsuji;Y. Otani
反铁磁体作为自旋电子学的突破性材料，因其对电场和磁场的独特响应而备受关注。由于缺乏局域反转对称性，电流诱导的Néel序自旋轨道力矩可以操纵共线CuMnAs中的反铁磁畴壁。在这里，我们证明了AFDW的电成核、位移和探测也是可能的，在非共线反铁磁体中也是可能的，即具有局部反转对称性的手性Mn3Sn.非对称磁阻测量表明，AFDW平行于微制造线中的Kagome平面。数值计算表明，这些AFDW由阶梯式亚微米尺寸的Bloch壁状自旋织构组成，其中八极矩在三段域壁上逐渐旋转。我们进一步观察到，脉冲电流的应用驱动这些基于八极杆的AFDW沿线。我们的发现可以为在手性反铁磁材料中设计AFDW结构提供指导原则。
Antiferromagnets exhibiting distinctive responses to the electric and magnetic fields have attracted attention as breakthrough materials in spintronics. The current-induced Néel-order spin-orbit torque can manipulate the antiferromagnetic domain wall (AFDW) in a collinear CuMnAs owing to a lack of local inversion symmetry. Here, we demonstrate that the electrical nucleation, displacement, and detection of AFDWs are also possible in a noncollinear antiferromagnet, i.e., chiral Mn3Sn with local inversion symmetry. The asymmetric magnetoresistance measurements reveal that AFDWs align parallel to the kagome planes in the microfabricated wire. Numerical calculation shows these AFDWs consist of stepwise sub-micron size Bloch wall-like spin textures in which the octupole moment gradually rotates over three segments of domain walls. We further observed that the application of a pulse-current drives these octupole based AFDWs along the wire. Our findings could provide a guiding principle for engineering the AFDW structure in the chiral antiferromagnetic materials.