Large exchange bias enhancement and control of ferromagnetic energy landscape by solid-state hydrogen gating
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s41467-023-43955-z.pdf
Description
Published version
Size
1.34 MB
Format
Adobe PDF
Checksum (MD5)
90203e8a4a1bed104b9447fded821a71
Author(s)
Hasan, M Usama
Kossak, Alexander E
Beach, Geoffrey SD
Date Issued
December 21, 2023
Journal
Nature Communications
Publisher
Springer Science and Business Media LLC
Citation
Hasan, M.U., Kossak, A.E. & Beach, G.S.D. Large exchange bias enhancement and control of ferromagnetic energy landscape by solid-state hydrogen gating. Nat Commun 14, 8510 (2023).
Version
Final published version
Abstract
Voltage control of exchange bias is desirable for spintronic device applications, however dynamic modulation of the unidirectional coupling energy in ferromagnet/antiferromagnet bilayers has not yet been achieved. Here we show that by solid-state hydrogen gating, perpendicular exchange bias can be enhanced by > 100% in a reversible and analog manner, in a simple Co/Co0.8Ni0.2O heterostructure at room temperature. We show that this phenomenon is an isothermal analog to conventional field-cooling and that sizable changes in average coupling energy can result from small changes in AFM grain rotatability. Using this method, we show that a bi-directionally stable ferromagnet can be made unidirectionally stable, with gate voltage alone. This work provides a means to dynamically reprogram exchange bias, with broad applicability in spintronics and neuromorphic computing, while simultaneously illuminating fundamental aspects of exchange bias in polycrystalline films.
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DOI of Published Version
https://doi.org/10.1038/s41467-023-43955-z
