Correlation-driven eightfold magnetic anisotropy in a two-dimensional oxide monolayer

被引：56

作者：

Cui, Zhangzhang ^{[1
,2
]}

Grutter, Alexander J. ^{[3
]}

Zhou, Hua ^{[4
]}

Cao, Hui ^{[1
,2
,4
]}

Dong, Yongqi ^{[1
,4
]}

Gilbert, Dustin A. ^{[3
,5
]}

Wang, Jingyuan ^{[6
]}

Liu, Yi-Sheng ^{[7
]}

Ma, Jiaji ^{[8
]}

Hu, Zhenpeng ^{[9
]}

Guo, Jinghua ^{[7
]}

Xia, Jing ^{[6
]}

Kirby, Brian J. ^{[3
]}

Shafer, Padraic ^{[7
]}

Arenholz, Elke ^{[7
,10
]}

Chen, Hanghui ^{[8
,11
,12
]}

Zhai, Xiaofang ^{[1
,2
,13
]}

Lu, Yalin ^{[1
,2
]}

机构：

[1] Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Natl Synchrotron Radiat Lab, Hefei 230026, Anhui, Peoples R China

[2] Univ Sci & Technol China, Synerget Innovat Ctr Quantum Informat & Quantum P, Hefei 230026, Anhui, Peoples R China

[3] NIST, Ctr Neutron Res, Gaithersburg, MD 20899 USA

[4] Argonne Natl Lab, Adv Photon Source, Lemont, IL 60439 USA

[5] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA

[6] Univ Calif Irvine, Dept Phys, Irvine, CA 92697 USA

[7] Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA

[8] NYU Shanghai, NYU ECNU Inst Phys, Shanghai 200122, Peoples R China

[9] Nankai Univ, Sch Phys, Tianjin 300071, Peoples R China

[10] Cornell Univ, Cornell High Energy Synchrotron Source, Ithaca, NY 14853 USA

[11] East China Normal Univ, Sch Phys & Mat Sci, State Key Lab Precis Spect, Shanghai 200062, Peoples R China

[12] NYU, Dept Phys, New York, NY 10027 USA

[13] ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai 201210, Peoples R China

来源：

SCIENCE ADVANCES | 2020年 / 6卷 / 15期

基金：

中国国家自然科学基金;

关键词：

WEAK FERROMAGNETISM; SUPERCONDUCTIVITY; HETEROSTRUCTURES; COEXISTENCE; ORDER; SPIN;

D O I：

10.1126/sciadv.aay0114

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Engineering magnetic anisotropy in two-dimensional systems has enormous scientific and technological implications. The uniaxial anisotropy universally exhibited by two-dimensional magnets has only two stable spin directions, demanding 180 degrees spin switching between states. We demonstrate a previously unobserved eightfold anisotropy in magnetic SrRuO3 monolayers by inducing a spin reorientation in (SrRuO3)(l)/(SrTiO3)(N) superlattices, in which the magnetic easy axis of Ru spins is transformed from uniaxial (001) direction (N < 3) to eightfold (111) directions (N >= 3). This eightfold anisotropy enables 71 degrees and 109 degrees spin switching in SrRuO3 monolayers, analogous to 71 degrees and 109 degrees polarization switching in ferroelectric BiFeO3. First-principle calculations reveal that increasing the SrTiO3 layer thickness induces an emergent correlation-driven orbital ordering, tuning spin-orbit interactions and reorienting the SrRuO3 monolayer easy axis. Our work demonstrates that correlation effects can be exploited to substantially change spin-orbit interactions, stabilizing unprecedented properties in two-dimensional magnets and opening rich opportunities for low-power, multistate device applications.

引用

页数：8

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