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共振纳米衍射X射线成像揭示了磁畴在复杂氧化物自旋热电子学中的作用。

Resonant nanodiffraction x-ray imaging reveals role of magnetic domains in complex oxide spin caloritronics.

作者信息

Evans Paul G, Marks Samuel D, Geprägs Stephan, Dietlein Maxim, Joly Yves, Dai Minyi, Hu Jiamian, Bouchenoire Laurence, Thompson Paul B J, Schülli Tobias U, Richard Marie-Ingrid, Gross Rudolf, Carbone Dina, Mannix Danny

机构信息

University of Wisconsin-Madison, Madison, WI 53706, USA.

Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany.

出版信息

Sci Adv. 2020 Oct 2;6(40). doi: 10.1126/sciadv.aba9351. Print 2020 Oct.

DOI:10.1126/sciadv.aba9351
PMID:33008906
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7852389/
Abstract

Spin electronic devices based on crystalline oxide layers with nanoscale thicknesses involve complex structural and magnetic phenomena, including magnetic domains and the coupling of the magnetism to elastic and plastic crystallographic distortion. The magnetism of buried nanoscale layers has a substantial impact on spincaloritronic devices incorporating garnets and other oxides exhibiting the spin Seebeck effect (SSE). Synchrotron hard x-ray nanobeam diffraction techniques combine structural, elemental, and magnetic sensitivity and allow the magnetic domain configuration and structural distortion to be probed in buried layers simultaneously. Resonant scattering at the Gd L edge of GdFeO layers yields magnetic contrast with both linear and circular incident x-ray polarization. Domain patterns facet to form low-energy domain wall orientations but also are coupled to elastic features linked to epitaxial growth. Nanobeam magnetic diffraction images reveal diverse magnetic microstructure within emerging SSE materials and a strong coupling of the magnetism to crystallographic distortion.

摘要

基于具有纳米级厚度的晶体氧化物层的自旋电子器件涉及复杂的结构和磁现象，包括磁畴以及磁与弹性和塑性晶体畸变的耦合。掩埋纳米级层的磁性对包含石榴石和其他表现出自旋塞贝克效应（SSE）的氧化物的自旋热电器件有重大影响。同步加速器硬X射线纳米束衍射技术结合了结构、元素和磁灵敏度，能够同时探测掩埋层中的磁畴结构和结构畸变。GdFeO层在Gd L边的共振散射在入射X射线的线性和圆偏振下都产生磁对比度。畴图案形成低能畴壁取向的小平面，但也与外延生长相关的弹性特征相耦合。纳米束磁衍射图像揭示了新兴SSE材料中多样的磁微观结构以及磁与晶体畸变的强耦合。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d691/7852389/4677869ab287/aba9351-F5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d691/7852389/39a170444334/aba9351-F1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d691/7852389/06e9182320bc/aba9351-F2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d691/7852389/0873c343d9d5/aba9351-F3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d691/7852389/449fa60bb5dd/aba9351-F4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d691/7852389/4677869ab287/aba9351-F5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d691/7852389/39a170444334/aba9351-F1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d691/7852389/06e9182320bc/aba9351-F2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d691/7852389/0873c343d9d5/aba9351-F3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d691/7852389/449fa60bb5dd/aba9351-F4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d691/7852389/4677869ab287/aba9351-F5.jpg

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本文引用的文献

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