Experimental study demonstrates spin-orbit torque in single iron-manganese layers, indicating that additional nonmagnetic layers are not required to manipulate magnetization.
Spin-orbit torque (SOT) has been demonstrated as a promising means to manipulate the magnetization of a ferromagnet in a device, but so far has been observed mainly in systems with broken bulk or structure-inversion symmetry. This study reports the observation of SOT in single Fe0.8Mn0.2 layers. Due to the scattering asymmetry for spin-up and spin-down electrons, the torques from the top and bottom surfaces simply add up instead of canceling each other out, which effectively removes the requirement for spatial-inversion asymmetry in generating SOT. This means SOT can be created in a ferromagnet without the need for an additional nonmagnetic layer.
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Luo et al. (2019) studied this question.
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