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No.3(pp.101-136)

Home > Issues > Volume 14 (2009) > No.3(pp.101-136)

Current-Driven Domain-Wall Depinning in Pt/CoFe/Pt Nanowires with Perpendicular Magnetic Anisotropy

Journal of Magnetics, Volume 14, Number 3, 30 Sep 2009, Pages 101-103

Kab-Jin Kim(Department of Physics, Seoul National University), Jae-Chul Lee(Department of Physics, Seoul National University), Sug-Bong Choe*

(Department of Physics, Seoul National University)

Abstract

The spin transfer torque efficiency was determined experimentally by observing the current-driven domainwall depinning of Pt/CoFe/Pt nanowires with perpendicular magnetic anisotropy. The depinning time was exponentially proportional to the applied magnetic field, and was well explained by the Néel-Brown formula. The depinning time and threshold magnetic field were varied considerably by injecting current into the nanowire. The spin transfer torque efficiency was estimated to be (7.2±0.9)×10⁻¹⁵ Tm²/A from the linear dependence of the threshold current density with respect to the applied magnetic field.

Keywords: spin transfer torque; domain wall motion; perpendicular magnetic anisotropy

DOI: 10.4283/JMAG.2009.14.3.101

Full Text: PDF

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