Enhanced spin–orbit torque via interface engineering in Pt/CoFeB/MgO heterostructures
作者： Seung-Young Park , Wooseung Ham , Yoshinori Kotani , Tetsuya Nakamura , Motohiro Suzuki
DOI: 10.1063/1.5084201
关键词:
摘要: Spin–orbit torque facilitates efficient magnetisation switching via an in-plane current in perpendicularly magnetised heavy-metal/ferromagnet heterostructures. The efficiency of spin–orbit-torque-induced is determined by the charge-to-spin conversion arising from either bulk or interfacial spin–orbit interactions both. Here, we demonstrate that and resultant Pt/CoFeB systems are significantly enhanced modification involving Ti insertion between Pt CoFeB layers. Spin pumping X-ray magnetic circular dichroism experiments reveal this enhancement due to additional interface-generated spin non-magnetic interface and/or improved transparency achieved suppressing proximity-induced moment layer. Our results engineering affords effective approach improve thereby efficiency.Spin–orbit efficiency.
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