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Domain-wall dynamics at micropatterned constrictions in ferromagnetic (Ga,Mn)As epilayers

Honolka, J. and Masmanidis, S. and Tang, H. X. and Roukes, M. L. and Awschalom, D. D. (2005) Domain-wall dynamics at micropatterned constrictions in ferromagnetic (Ga,Mn)As epilayers. Journal of Applied Physics, 97 (6). Art. No. 063903. ISSN 0021-8979. http://resolver.caltech.edu/CaltechAUTHORS:HONjap95

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Abstract

The influence of sub-µm geometric constrictions on 90° magnetic domain-wall nucleation and propagation in stripes of ferromagnetic (Ga0.95,Mn0.05)As was explored. Measurements of the magnetic switching behavior were performed during ramping of an external magnetic field at constant rate and at constant field in the time domain. Demagnetizing fields are found to play a crucial role in the switching behavior around the region of the constriction. Depending on the sample's initial magnetization the constriction can either assist domain-wall nucleation or hinder its propagation.


Item Type:Article
Additional Information:© 2005 American Institute of Physics. Received 2 August 2004; accepted 19 December 2004; published online 4 March 2005. We are grateful for financial support from the DARPA/SPINS Program and the Deutsche Forschungsgemeinschaft. For valuable discussions we would like to thank Professor P. E. Wigen.
Subject Keywords:gallium arsenide; manganese compounds; ferromagnetic materials; magnetic semiconductors; III-V semiconductors; magnetic epitaxial layers; semiconductor epitaxial layers; magnetic domain walls; magnetic switching; demagnetisation; nucleation; magnetic anisotropy
Record Number:CaltechAUTHORS:HONjap95
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:HONjap95
Alternative URL:http://dx.doi.org/10.1063/1.1861512
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:3531
Collection:CaltechAUTHORS
Deposited By: Lindsay Cleary
Deposited On:12 Jun 2006
Last Modified:26 Dec 2012 08:54

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