Disorder dependent spin-orbit torques in L10 FePt single layer

Abstract

We report spin-orbit torques (SOT) in L10-ordered perpendicularly magnetized FePt single layer, which is significantly influenced by disorder. Recently, self-induced SOT in L10-FePt single layer has been investigated, which is ascribed to the composition gradient along the film normal direction. However, the determined mechanisms for magnetization switching have not been fully studied. With varying growth temperatures, we have prepared FePt single layers with same thickness (3 nm) but with different disordering. We have found that nearly full magnetization switching only happens in more disordered films, and the magnetization switching ratio becomes smaller as increasing L10 ordering. The method for deriving effective spin torque fields in the previous studies cannot fully explain the spin current generation and self-induced SOT in L10-FePt single layer. Combined with Magneto-Optical Kerr Effect microscopy and anomalous Hall effect measurements, we concluded that the disorder should determine the formation of domain walls, as well as the spin current generation.

arXiv commentarXiv admin note: text overlap with arXiv:1411.3249 by other authors

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Cited by in corpus (5)

• Unidirectional orbital magnetoresistance in light metal/ferromagnet bilayers
• Strong bulk spin-orbit torques quantified in the van der Waals ferromagnet Fe3GeTe2
• Single-layer spin-orbit-torque magnetization switching due to spin Berry curvature generated by minute spontaneous atomic displacement in a Weyl oxide
• Enhanced torque efficiency in ferromagnetic multilayers by introducing naturally oxidized Cu
• Self-induced spin pumping and inverse spin Hall effect in single FePt thin films