5 years ago

Oscillatory spin-orbit torque switching induced by field-like torques.

Rajagopalan Ramaswamy, Kaiming Cai, Jung Bum Yoon, Jong Min Lee, Xuepeng Qiu, Jaesung Son, Hyunsoo Yang, Jae Hyun Kwon, Rahul Mishra, Shalabh Srivastava

Deterministic magnetization switching using spin-orbit torque (SOT) has recently emerged as an efficient means to electrically control the magnetic state of ultrathin magnets. The SOT switching still lacks in oscillatory switching characteristics over time, therefore, it is limited to bipolar operation where a change in polarity of the applied current or field is required for bistable switching. The coherent rotation based oscillatory switching schemes cannot be applied to SOT because the SOT switching occurs through expansion of magnetic domains. Here, we experimentally achieve oscillatory switching in incoherent SOT process by controlling domain wall dynamics. We find that a large field-like component can dynamically influence the domain wall chirality which determines the direction of SOT switching. Consequently, under nanosecond current pulses, the magnetization switches alternatively between the two stable states. By utilizing this oscillatory switching behavior we demonstrate a unipolar deterministic SOT switching scheme by controlling the current pulse duration.

Publisher URL: http://arxiv.org/abs/1711.05369

DOI: arXiv:1711.05369v1

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