Torque approach for tuning exchange bias training effect in polycrystalline NiFe/FeMn bilayers

Abstract : In order to tune the exchange bias training effect, a torque approach is proposed. Torque loops are performed between two consecutive hysteresis loops by clockwise and counterclockwise rotation of the sample within an angular range under an in-plane external magnetic field. For the angular range from 0° to 180°, the coercivity H C and the exchange field H E are both reduced and the pinning direction PD orientation is changed, exhibiting the first type training effect. For the angular range from 20° to 380°, H C and the PD orientation are almost unchanged although H E is reduced, exhibiting the second type training effect.
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Z. Shi, J. Du, R. Chantrell, S. Mangin, S. Zhou. Torque approach for tuning exchange bias training effect in polycrystalline NiFe/FeMn bilayers. Applied Physics Letters, American Institute of Physics, 2011, 98 (12), pp.122507. ⟨10.1063/1.3569140⟩. ⟨hal-02085981⟩

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