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• W4387464386 abstract "The current-induced switching of in-plane exchange bias field (<i>H</i>_eb) has many advantages, such as, switching without assistance of external magnetic field, excellent immunity to magnetic field, and robust magnetic anisotropy. However, the blocking temperature of the nanoscale antiferromagnet/ferromagnet (AFM/FM) heterostructure is relatively low and susceptible to thermal effects. Therefore, the Joule heating theoretically plays a substantial role in the switching of <i>H</i>_eb driven by current, but its underlying mechanism requires further investigation and verification. We prepared a series of Pt/IrMn/Py heterostructures with varying antiferromagnet IrMn thicknesses and systematically investigated the role of thermal effects in current-driven <i>H</i>_eb switching. These results demonstrate that, under millisecond-level current pulses, Joule heating heats up the device above the blocking temperature, leading to the decoupling of exchange coupling at AFM/FM interface. Simultaneously, the Oersted field and spin-orbit torque field generated by the current switches the ferromagnetic moments, and then a new <i>H</i>_eb will be induced along the direction of the ferromagnetic moments during the cooling process. Furthermore, during the switching process of <i>H</i>_eb, the anisotropic magnetoresistance curve of the AFM/FM heterostructure exhibits a temperature-dependent two-step magnetization reversal phenomenon. Theoretical analysis indicates that this phenomenon arises from the competitive relationship between exchange bias coupling at AFM/FM interface and direct exchange coupling between the ferromagnetic moments. The findings of this study elucidate the crucial role of thermal effects in the current-driven switching of <i>H</i>_eb, thereby contributing to the advancement of spintronic devices based on electrically controlled <i>H</i>_eb." @default.
• W4387464386 created "2023-10-10" @default.
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• W4387464386 date "2023-01-01" @default.
• W4387464386 modified "2023-10-11" @default.
• W4387464386 title "Significant role of thermal effects in current-induced exchange bias field switching at antiferromagnet/ferromagnet interface" @default.
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• W4387464386 doi "https://doi.org/10.7498/aps.73.20231374" @default.
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