从体心立方全铁/钴磁性超晶格中自旋取向的终止依赖化学敏感性到铁磁体人工表面的概念

From Termination Dependent Chemical Sensitivity of Spin Orientation in All-bcc Fe/Co Magnetic Superlattices toward the Concept of an Artificial Surface of a Ferromagnet.

作者信息

Ślęzak M, Dróżdż P, Matlak K, Kozioł-Rachwał A, Sasikala Devi A A, Alatalo M, Ślęzak T

机构信息

Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, 30-059 Kraków, Poland.

National Synchrotron Radiation Centre SOLARIS, Jagiellonian University, 30-392 Kraków, Poland.

出版信息

J Phys Chem Lett. 2022 Sep 15;13(36):8522-8528. doi: 10.1021/acs.jpclett.2c02139. Epub 2022 Sep 6.

DOI:10.1021/acs.jpclett.2c02139

PMID:36067031

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9486937/

Abstract

Adsorption of gases on the surface of all-bcc (Fe/Co) superlattices drives the in-plane, 90° magnetization rotation of the bulk-like Fe(110) supporting ferromagnet. Both experimental and theoretical results prove that terminating the surface of (Fe/Co) superlattices either by Co or by Fe switches "ON" or "OFF" the spin orientation sensitivity to adsorption. Results indicate that purely surface limited adsorption processes strongly modify the magnetic anisotropy of the entire (Fe/Co) superlattice, which acts as a kind of "artificial" surface of the bulky Fe(110) ferromagnet. Such an artificial magnetic surface anisotropy concept not only enhances the surface contribution in classical surface-bulk competition but also provides its additional chemical sensitivity.

摘要

气体在全体心立方（Fe/Co）超晶格表面的吸附驱动了块状Fe(110)支撑铁磁体的面内90°磁化旋转。实验和理论结果均证明，用Co或Fe终止（Fe/Co）超晶格的表面会开启或关闭对吸附的自旋取向敏感性。结果表明，纯表面受限的吸附过程会强烈改变整个（Fe/Co）超晶格的磁各向异性，该超晶格充当了块状Fe(110)铁磁体的一种“人工”表面。这种人工磁表面各向异性概念不仅增强了经典表面-体相竞争中的表面贡献，还提供了额外的化学敏感性。