Coherent ac spin current transmission across an antiferromagnetic CoO insulator

Li, Q.; Yang, M.; Klewe, C.; Shafer, P.; N’Diaye, A. T.; Hou, D.; Wang, T. Y.; Gao, N.; Saitoh, E.; Hwang, C.; Hicken, R. J.; Li, J.; Arenholz, E.; Qiu, Z. Q.

doi:10.1038/s41467-019-13280-5

Title: Coherent ac spin current transmission across an antiferromagnetic CoO insulator

Journal Article · Wed Nov 20 00:00:00 EST 2019 · Nature Communications

DOI:https://doi.org/10.1038/s41467-019-13280-5· OSTI ID:1580987

Li, Q. ^[1]; Yang, M. ^[1]; Klewe, C. ^[2];

^[2];

^[2]; Hou, D. ^[3]; Wang, T. Y. ^[1]; Gao, N. ^[1]; Saitoh, E. ^[3]; Hwang, C. ^[4];

^[5]; Li, J. ^[6]; Arenholz, E. ^[2];

^[1]

Univ. of California, Berkeley, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Tohoku University, Sendai (Japan)
Korea Research Institute of Standards and Science, Daejeon (Korea)
Univ. of Exeter, Devon (United Kingdom)
Peking Univ., Beijing (China)

The recent discovery of spin current transmission through antiferromagnetic insulating materials opens up vast opportunities for fundamental physics and spintronics applications. The question currently surrounding this topic is: whether and how could THz antiferromagnetic magnons mediate a GHz spin current? This mismatch of frequencies becomes particularly critical for the case of coherent ac spin current, raising the fundamental question of whether a GHz ac spin current can ever keep its coherence inside an antiferromagnetic insulator and so drive the spin precession of another ferromagnet layer coherently? Utilizing element- and time-resolved x-ray pump-probe measurements on Py/Ag/CoO/Ag/Fe₇₅Co₂₅/MgO(001) heterostructures, here we demonstrate that a coherent GHz ac spin current pumped by the Py ferromagnetic resonance can transmit coherently across an antiferromagnetic CoO insulating layer to drive a coherent spin precession of the Fe₇₅Co₂₅ layer. Further measurement results favor thermal magnons rather than evanescent spin waves as the mediator of the coherent ac spin current in CoO.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)

Sponsoring Organization:: National Science Foundation (NSF); National Research Foundation of Korea (NRF); National Key Research and Development Program of China; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; Japan Science and Technology Agency (JST); Engineering and Physical Sciences Research Council (EPSRC)

Grant/Contract Number:: AC02-05CH11231; DMR-1504568; EP/J018767/1; EP/P02047X/1

OSTI ID:: 1580987

Journal Information:: Nature Communications, Vol. 10, Issue 1; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 24 works

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References (37)

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