Domain-wall creep driven by spin torque in nanoscale ferromagnetic cylinders

Singh, Amrita ; Ghosh, Arindam (2011) Domain-wall creep driven by spin torque in nanoscale ferromagnetic cylinders Physical Review B: Condensed Matter and Materials Physics, 84 (6). Article ID 060407. ISSN 1098-0121

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Official URL: http://journals.aps.org/prb/abstract/10.1103/PhysR...

Related URL: http://dx.doi.org/10.1103/PhysRevB.84.060407

Abstract

We have explored the mechanism of spin-torque-driven domain-wall (DW) depinning in cylindrical nanowires of nickel using noise in electrical resistance. We find that the spectral slope of noise is a sensitive probe to the DW kinetics that reveals a creeplike behavior of the DWs at the depinning threshold and diffusive DW motion at higher spin-torque drive. Different regimes of DW kinetics were characterized by universal kinetic exponents.

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