Chiral Mesostructured NiO Films with Spin Polarisation

被引：69

作者：

Bai, Te ^{[1
]}

Ai, Jing ^{[2
]}

Liao, Liyang ^{[4
]}

Luo, Junwei ^{[3
]}

Song, Cheng ^{[4
]}

Duan, Yingying ^{[2
]}

Han, Lu ^{[2
]}

Che, Shunai ^{[1
,2
]}

机构：

[1] Shanghai Jiao Tong Univ, Sch Chem & Chem Engn, State Key Lab Met Matrix Composites, Shanghai Key Lab Mol Engn Chiral Drugs, 800 Dongchuan Rd, Shanghai 200240, Peoples R China

[2] Tongji Univ, Sch Chem Sci & Engn, 1239 Siping Rd, Shanghai 200092, Peoples R China

[3] Chinese Acad Sci, Inst Semicond, State Key Lab Superlattices & Microstruct, Beijing 100083, Peoples R China

[4] Tsinghua Univ, Sch Mat Sci & Engn, Lab Adv Mat MOE, Beijing 100084, Peoples R China

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2021年 / 60卷 / 17期

基金：

中国国家自然科学基金;

关键词：

antiferromagnetic material; chiral mesostructure; chirality-dependent spin polarisation; magnetic circular dichroism; magnetic-tip conducting atomic force microscopy; SELECTIVITY; MOLECULES; SURFACES;

D O I：

10.1002/anie.202101069

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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.

引用

页码：9421 / 9426

页数：6

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