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

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.

Authors:
 [1];  [1];  [2]; ORCiD logo [2]; ORCiD logo [2];  [3];  [1];  [1];  [3];  [4]; ORCiD logo [5];  [6];  [2]; ORCiD logo [1]
+ Show Author Affiliations
  1. Univ. of California, Berkeley, CA (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  3. Tohoku University, Sendai (Japan)
  4. Korea Research Institute of Standards and Science, Daejeon (Korea)
  5. Univ. of Exeter, Devon (United Kingdom)
  6. Peking Univ., Beijing (China)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Sponsoring Org.:
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)
OSTI Identifier:
1580987
Grant/Contract Number:  
AC02-05CH11231; DMR-1504568; EP/J018767/1; EP/P02047X/1
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 10; Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING

Citation Formats

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., and Qiu, Z. Q. Coherent ac spin current transmission across an antiferromagnetic CoO insulator. United States: N. p., 2019. Web. doi:10.1038/s41467-019-13280-5.
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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. Coherent ac spin current transmission across an antiferromagnetic CoO insulator. United States. https://doi.org/10.1038/s41467-019-13280-5
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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., and Qiu, Z. Q. Wed . "Coherent ac spin current transmission across an antiferromagnetic CoO insulator". United States. https://doi.org/10.1038/s41467-019-13280-5. https://www.osti.gov/servlets/purl/1580987.
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@article{osti_1580987,
title = {Coherent ac spin current transmission across an antiferromagnetic CoO insulator},
author = {Li, Q. and Yang, M. and Klewe, C. and Shafer, P. and N’Diaye, A. T. and Hou, D. and Wang, T. Y. and Gao, N. and Saitoh, E. and Hwang, C. and Hicken, R. J. and Li, J. and Arenholz, E. and Qiu, Z. Q.},
abstractNote = {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.},
doi = {10.1038/s41467-019-13280-5},
journal = {Nature Communications},
number = 1,
volume = 10,
place = {United States},
year = {Wed Nov 20 00:00:00 EST 2019},
month = {Wed Nov 20 00:00:00 EST 2019}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1038/s41467-019-13280-5
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Works referenced in this record:

Spin Backflow and ac Voltage Generation by Spin Pumping and the Inverse Spin Hall Effect
journal, May 2013

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Antiferromagnet-mediated spin transfer between a metal and a ferromagnet
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journal, August 2016

Coherent terahertz control of antiferromagnetic spin waves
text, January 2011

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  • Universität Regensburg
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Field-free switching of perpendicular magnetization through spin–orbit torque in antiferromagnet/ferromagnet/oxide structures
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Tunable long-distance spin transport in a crystalline antiferromagnetic iron oxide
journal, September 2018

Transformation of spin current by antiferromagnetic insulators
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Antiferromagnetic spin textures and dynamics
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Spin pumping and spin-transfer torques in antiferromagnets
text, January 2014

Direct detection of pure spin-current by x-ray pump-probe measurements
text, January 2015

Transformation of spin current by antiferromagnetic insulators
text, January 2015

Temperature Dependence of Angular Momentum Transport Across Interfaces
text, January 2016

Spin colossal magnetoresistance in an antiferromagnetic insulator
text, January 2018

Spin-current probe for phase transition in an insulator
journal, August 2016

  • Qiu, Zhiyong; Li, Jia; Hou, Dazhi
  • Nature Communications, Vol. 7, Issue 1
  • DOI: 10.1038/ncomms12670

Field-free switching of perpendicular magnetization through spin–orbit torque in antiferromagnet/ferromagnet/oxide structures
journal, July 2016

  • Oh, Young-Wan; Chris Baek, Seung-heon; Kim, Y. M.
  • Nature Nanotechnology, Vol. 11, Issue 10
  • DOI: 10.1038/nnano.2016.109

Excitation of coupled spin–orbit dynamics in cobalt oxide by femtosecond laser pulses
journal, September 2017

Antiferromagnetic spin textures and dynamics
journal, March 2018

Tunable long-distance spin transport in a crystalline antiferromagnetic iron oxide
journal, September 2018

Magnetic Moment Orientation-Dependent Spin Dissipation in Antiferromagnets
journal, December 2017

Electrical switching of an antiferromagnet
journal, January 2016

Conduction of spin currents through insulating oxides
text, January 2013

Transformation of spin current by antiferromagnetic insulators
text, January 2015

Spin colossal magnetoresistance in an antiferromagnetic insulator
text, January 2018

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