Critical role of orbital hybridization in the Dzyaloshinskii-Moriya interaction of magnetic interfaces

Zhu, Lijun; Zhu, Lujun; Ma, Xin; Li, Xiaoqin; Buhrman, Robert A.

doi:10.1038/s42005-022-00932-0

Title: Critical role of orbital hybridization in the Dzyaloshinskii-Moriya interaction of magnetic interfaces

Journal Article · Fri Jun 17 00:00:00 EDT 2022 · Communications Physics

DOI:https://doi.org/10.1038/s42005-022-00932-0· OSTI ID:1978735

^[1]; Zhu, Lujun ^[2]; Ma, Xin ^[3]; Li, Xiaoqin ^[3]; Buhrman, Robert A. ^[4]

Chinese Academy of Sciences (CAS), Beijing (China); Cornell University, Ithaca, NY (United States)
Shaanxi Normal University, Xi an (China)
University of Texas, Austin, TX (United States)
Cornell University, Ithaca, NY (United States)

Dzyaloshinskii-Moriya interaction (DMI), an interfacial spin-orbit coupling (ISOC)-related effect, has become foundational for spintronic research and magnetic memory and computing technologies. However, the underlying mechanism of DMI, including the quantitative role of ISOC, has remained a long-standing unsettled problem due to the great challenge in quantifying and widely tuning ISOC strength in a strong DMI material system. Here, we find that DMI, ISOC, and orbital hybridization at the model magnetic interface Au_1-xPt_x/Co can be quantified and tuned significantly at the same time through the composition of the Au_1-xPt_x, without varying the bulk SOC and the electronegativity. From this ability, we establish that the widespread expectation that DMI should scale in linear proportion to ISOC breaks down at the Au_1-xPt_x/Co interface where degree of orbital hybridization varies with the Au_1-xPt_x composition and that the unexpected DMI behaviors can be understood well by the critical role of orbital hybridization. Our study provides a quantitative frame for comprehensively understanding interfacial DMI of various magnetic interfaces and establishes orbital hybridization as a new degree of freedom for controlling DMI in high-performance chiral domain wall/skyrmion devices and ultrafast magnetic tunnel junctions.

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Research Organization:: Univ. of California, Riverside, CA (United States); Cornell Univ., Ithaca, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); US Department of the Navy, Office of Naval Research (ONR); National Science Foundation (NSF); Defense Advanced Research Projects Agency (DARPA); Chinese Academy of Sciences; National Natural Science Foundation of China (NSFC)

Grant/Contract Number:: SC0012670; N00014-19-1-2143; DMR-1719875; D18AC00009; XDB44000000; ECCS-1542081; DMR1720595; 51901121

OSTI ID:: 1978735

Journal Information:: Communications Physics, Vol. 5, Issue 1; ISSN 2399-3650

Publisher:: Springer NatureCopyright Statement

Country of Publication:: United States

Language:: English

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