Large exchange bias enhancement and control of ferromagnetic energy landscape by solid-state hydrogen gating

M. Usama Hasan, Alexander E. Kossak and Geoffrey S. D. Beach ()
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M. Usama Hasan: Massachusetts Institute of Technology
Alexander E. Kossak: Massachusetts Institute of Technology
Geoffrey S. D. Beach: Massachusetts Institute of Technology

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: 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.

Date: 2023
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DOI: 10.1038/s41467-023-43955-z

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