Abstract
Spin-polarized current-changed exchange bias has been observed in NiFe∕Cu∕NiFe∕FeMn spin valve with a current-in-plane geometry. With increasing current pulse, exchange-bias field Hex first decreases and then increases in the opposite direction. Hex shows little dependence on the applied current pulse above certain value. Furthermore, for the samples with different exchange biases, exchange bias field exhibits a clear dependence on the applied pulse. The results provide clear evidence to support the prediction that a spin-polarized current can exert a torque at antiferromagnetic metals due to interactions between polarized electrons and the antiferromagnetic moments.
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