Overview
Terminology: SVB - Spin-valve Bench
(software package); STT - spin torque transfer
This example illustrates the computational results of STT-induced domain-wall motion in a patterned nanowire
specimen.
The patterning of the sample from its initial rectangular shape to its final shape was carried out with the
Cellider
array-patterning tool, using an image mask.
The initial magnetization state of the sample is uniform longitudinal magnetization with an abrupt domain-wall in the center.
This initial state is set with the Mag-O-Mat
tool.
The material parameters are close to those of Permalloy (Ni20Fe80, saturation magnetization Ms = 860 emu/cc, no induced magnetocrystalline
anisotropy, Gilbert damping constant a = 0.1,
available solver option of Landau-Lifschitz_Gilbert (LLG) is used).
Self-STT effects are computed using the classic (Slonczewski) model that
is available as an option in SVB.
A negative current ramp is passed longitudinally through the sample.
The solution states of the calculation are recorded using the SVB
simulation record/playback feature. You can "play back" the
simulation to view a "movie" of the domain-reversal
process and to analyze it in detail.
Downloads:
Use the following link to download a zip file of this design:
SVB_STTSample1_5-21-09.ZIP
(Contains the computed design with recorded-simulation data and array-patterning mask file)
References*
A. Himeno, S. Kasai, and T. Ono, “Current-driven domain-wall motion in magnetic wires with asymmetric notches,”
Appl. Phys. Lett. 87, 243108 (2005).
*The cited references are provided for informational purposes
only and typically inspire
the creation of the highlighted design examples. MagOasis does not
necessarily endorse the contents of these references and the related MagOasis
web pages are not intended as commentaries on any aspects
whatsoever of these references.
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