Using an atomistic spin model, we have simulated spin wave injection and propagation into antiferromagnetic IrMn from an exchange coupled CoFe layer. The spectral characteristics of the exited spin waves have a complex beating behavior arising from the non-collinear nature of the antiferromagnetic order. We find that the frequency response of the system depends strongly on the strength and frequency of oscillating field excitations. We also find that the strength of excited spin waves strongly decays away from the interfacial layer with a frequency dependent attenuation. Our findings suggest that spin waves generated by coupled ferromagnets are too weak to reverse IrMn in their entirety even with resonant excitation of a coupled ferromagnet. However, efficient spin wave injection into the antiferromagnet is possible due to the non-collinear nature of the IrMn spin ordering.
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21 July 2020
Research Article|
July 15 2020
Spin wave excitations in exchange biased IrMn/CoFe bilayers
Special Collection:
Antiferromagnetic Spintronics
Sarah Jenkins
;
Sarah Jenkins
a)
Department of Physics, University of York
, York YO10 5DD, United Kingdom
a)Author to whom correspondence should be addressed: sarah.jenkins@york.ac.uk
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Roy. W. Chantrell;
Roy. W. Chantrell
Department of Physics, University of York
, York YO10 5DD, United Kingdom
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Richard F. L. Evans
Richard F. L. Evans
b)
Department of Physics, University of York
, York YO10 5DD, United Kingdom
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a)Author to whom correspondence should be addressed: sarah.jenkins@york.ac.uk
Note: This paper is part of the special topic on Antiferromagnetic Spintronics.
J. Appl. Phys. 128, 033903 (2020)
Article history
Received:
March 03 2020
Accepted:
June 26 2020
Citation
Sarah Jenkins, Roy. W. Chantrell, Richard F. L. Evans; Spin wave excitations in exchange biased IrMn/CoFe bilayers. J. Appl. Phys. 21 July 2020; 128 (3): 033903. https://doi.org/10.1063/5.0006232
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