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

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/Co_0.8Ni_0.2O 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 dynamic

SUBMITTER: Hasan MU 

PROVIDER: S-EPMC10740009 | biostudies-literature | 2023 Dec

REPOSITORIES: biostudies-literature