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Suppression of stochastic pinning in magnetic nanowire devices using "virtual" domain walls

Title
Suppression of stochastic pinning in magnetic nanowire devices using "virtual" domain walls
Authors
Hodges, MPP[Hodges, M. P. P.]Bryan, MT[Bryan, M. T.]Fry, PW[Fry, P. W.]Im, MY[Im, M. -Y.]Fischer, P[Fischer, P.]Hayward, TJ[Hayward, T. J.]
DGIST Authors
Im, MY[Im, M. -Y.]
Issue Date
2014-09-28
Citation
Journal of Applied Physics, 116(12)
Type
Article
Article Type
Article
Keywords
Magnetic Nanowires
ISSN
0021-8979
Abstract
We have investigated the pinning and depinning of "virtual" domain walls in planar magnetic nanowires. Such virtual walls are created when a conventional domain wall becomes annihilated at a narrow gap between two segments of a discontinuous nanowire. By using focused magneto-optical Kerr effect magnetometry to study the repeatability of their depinning, we show that virtual walls exhibit single-mode depinning distributions, characterized by remarkably low, sub-Oersted standard deviations. This is in stark contrast to the depinning of domain walls from conventional notch-shaped defects, which typically exhibit multi-mode depinning field distributions spanning tens to hundreds of Oersteds. High-resolution magnetic soft x-ray microscopy measurements are used to reveal that this high level of repeatability is the result of a simple mediated-nucleation process, which decouples the depinning mechanism from structure of the initially injected DWs. Our work serves as an example of how the complex and dynamical stochastic behaviors exhibited by domain walls in nanowires can be controlled. © 2014 AIP Publishing LLC.
URI
http://hdl.handle.net/20.500.11750/2377
DOI
10.1063/1.4896356
Publisher
American Institute of Physics Publishing
Files:
There are no files associated with this item.
Collection:
Emerging Materials ScienceETC1. Journal Articles


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