Abstract
Exchange bias (EB) has been a hot research topic since its discovery in the 1950s. In this paper, we present the peculiar temperature dependence of perpendicular EB in Pt/Co/Au/Cr2O3/Pt stacked films: the regeneration of the EB in the high temperature regime. Three temperature-dependent states are identified: (1) low temperature exchange-biased state, (2) middle temperature coercivity-enhanced state, and (3) high temperature regenerated exchange-biased state. At the boundary of these states, both EB field (HEB) and coercivity (HC) abruptly switch with the relationship HEB = ΔHC. The low temperature disappearance of EB can be interpreted based on the classical Meiklejohn–Bean exchange anisotropy model. A more complex temperature dependence of the interfacial spin alignment and magnetic domain wall width in the Cr2O3 layer is involved in the high temperature regeneration of EB.
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