Coherent ac spin current transmission across an antiferromagnetic CoO insulator

Q. Li, M. Yang, C. Klewe, P. Shafer, A. T. N’Diaye, D. Hou, T. Y. Wang, N. Gao, E. Saitoh, C. Hwang, R. J. Hicken, J. Li (), E. Arenholz and Z. Q. Qiu ()
Additional contact information
Q. Li: University of California at Berkeley
M. Yang: University of California at Berkeley
C. Klewe: Lawrence Berkeley National Laboratory
P. Shafer: Lawrence Berkeley National Laboratory
A. T. N’Diaye: Lawrence Berkeley National Laboratory
D. Hou: Tohoku University
T. Y. Wang: University of California at Berkeley
N. Gao: University of California at Berkeley
E. Saitoh: Tohoku University
C. Hwang: Yuseong
R. J. Hicken: University of Exeter
J. Li: School of Physics, Peking University
E. Arenholz: Lawrence Berkeley National Laboratory
Z. Q. Qiu: University of California at Berkeley

Nature Communications, 2019, vol. 10, issue 1, 1-6

Abstract: Abstract 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.

Date: 2019
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DOI: 10.1038/s41467-019-13280-5

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