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Nat Mater. 2014 Jul;13(7):699-704. doi: 10.1038/nmat3973. Epub 2014 Apr 28.

Magnetization switching through giant spin-orbit torque in a magnetically doped topological insulator heterostructure.

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  • 11] Department of Electrical Engineering, University of California, Los Angeles, California 90095, USA [2].
  • 2Department of Electrical Engineering, University of California, Los Angeles, California 90095, USA.
  • 3Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA.

Abstract

Recent demonstrations of magnetization switching induced by in-plane current in heavy metal/ferromagnetic heterostructures (HMFHs) have drawn great attention to spin torques arising from large spin-orbit coupling (SOC). Given the intrinsic strong SOC, topological insulators (TIs) are expected to be promising candidates for exploring spin-orbit torque (SOT)-related physics. Here we demonstrate experimentally the magnetization switching through giant SOT induced by an in-plane current in a chromium-doped TI bilayer heterostructure. The critical current density required for switching is below 8.9 × 10(4) A cm(-2) at 1.9 K. Moreover, the SOT is calibrated by measuring the effective spin-orbit field using second-harmonic methods. The effective field to current ratio and the spin-Hall angle tangent are almost three orders of magnitude larger than those reported for HMFHs. The giant SOT and efficient current-induced magnetization switching exhibited by the bilayer heterostructure may lead to innovative spintronics applications such as ultralow power dissipation memory and logic devices.

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