Chiral Mesostructured NiO Films with Spin Polarisation
Chiral Mesostructured NiO Films with Spin Polarisation
复制标题
具有自旋极化的手性介观结构氧化镍薄膜
DOI：
10.1002/anie.202101069
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发表时间：
2021-03-16
影响因子：
16.6
通讯作者：
Che, Shunai
中科院分区：
文献类型：
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作者：
Bai, Te;Ai, Jing;Che, Shunai
通过手性分子的对称破缺效应，在中心对称的非铁磁晶体——手性介结构NiO膜（CMNFs）中发现了自旋极化现象。手性分为两个层次：具有原子扭曲晶格的初级纳米片和具有二级螺旋堆叠的纳米片。利用手性相关磁尖导电原子力显微镜（mc-AFM）和磁场无关磁圆二色性（MCD）证实了CMNFs的自旋极化。推测电子在对称破缺电场中的转移可以产生手性相关的有效磁场。有效磁场产生的非对称自旋轨道耦合（SOC）选择性地改变了对映cmnf中相反的自旋运动。我们的发现为前所未有的功能无机材料的定向自旋控制提供了基本的见解。
Spin polarisation is found in the centrosymmetric nonferromagnetic crystals, chiral mesostructured NiO films (CMNFs), fabricated through the symmetry-breaking effect of a chiral molecule. Two levels of chirality were identified: primary nanoflakes with atomically twisted crystal lattices and secondary helical stacking of the nanoflakes. Spin polarisation of the CMNFs was confirmed by chirality-dependent magnetic-tip conducting atomic force microscopy (mc-AFM) and magnetic field-independent magnetic circular dichroism (MCD). Electron transfer in the symmetry-breaking electric field was speculated to create chirality-dependent effective magnetic fields. The asymmetric spin-orbit coupling (SOC) generated by effective magnetic fields selectively modifies the opposite spin motion in the antipodal CMNFs. Our findings provide fundamental insights for directional spin control in unprecedented functional inorganic materials.