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Electrical transport across an individual magnetic domain wall in (Ga,Mn)As microdevices

Tang, Hongxing and Roukes, Michael L. (2004) Electrical transport across an individual magnetic domain wall in (Ga,Mn)As microdevices. Physical Review B, 70 (20). Art. No. 205213. ISSN 1098-0121. http://resolver.caltech.edu/CaltechAUTHORS:TANprb04

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Abstract

Recent studies demonstrate that an individual magnetic domain wall (DW) can be trapped and reproducibly positioned within multiterminal (Ga,Mn)As microdevices. The electrical resistance obtained from such measurements is found to be measurably altered by the presence of this single entity. To elucidate these observations we develop a simple model for the electrical potential distribution along a multiterminal device in the presence of a single DW. This is employed to calculate the effect of a single DW upon the longitudinal and transverse resistance. The model provides very good agreement with experimental observations, and serves to highlight important deviations from simple theory. We show that measurements of transverse resistance along the channel permits establishing the position and the shape of the DW contained within it. An experimental scheme is developed that enables unambiguous extraction of the intrinsic DW resistivity. This permits the intrinsic contribution to be differentiated from resistivities originating from the bulk and from magnetic anisotropy—effects that are generally manifested as large backgrounds in the experiments.


Item Type:Article
Additional Information:©2004 The American Physical Society (Received 27 March 2004; published 23 November 2004) We acknowledge support from DARPA under grants DSO/SPINS-MDA 972-01-1-0024. We also thank Leon Balents, Anton Burkov, and Martin Veillette for initial discussions on this topic.
Subject Keywords:gallium arsenide; manganese compounds; III-V semiconductors; ferromagnetic materials; semiconductor devices; semimagnetic semiconductors; magnetic domain walls; magnetic anisotropy
Record Number:CaltechAUTHORS:TANprb04
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:TANprb04
Alternative URL:http://dx.doi.org/10.1103/PhysRevB.70.205213
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:3308
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:26 May 2006
Last Modified:26 Dec 2012 08:53

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