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Negative intrinsic resistivity of an individual domain wall in epitaxial (Ga,Mn)As microdevices

Tang, H. X. and Masmanidis, S. and Kawakami, R. K. and Awschalom, D. D. and Roukes, M. L. (2004) Negative intrinsic resistivity of an individual domain wall in epitaxial (Ga,Mn)As microdevices. Nature, 431 (7004). pp. 52-56. ISSN 0028-0836. doi:10.1038/nature02809.

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Magnetic domains, and the boundaries that separate them (domain walls, DWs), play a central role in the science of magnetism1. Understanding and controlling domains is important for many technological applications in spintronics, and may lead to new devices. Although theoretical efforts have elucidated several mechanisms underlying the resistance of a single DW, various experiments report conflicting results, even for the overall sign of the DW resistance. The question of whether an individual DW gives rise to an increase or decrease of the resistance therefore remains open. Here we report an approach to DW studies in a class of ferromagnetic semiconductors (as opposed to metals) that offer promise for spintronics. These experiments involve microdevices patterned from monocrystalline (Ga,Mn)As epitaxial layers. The giant planar Hall effect that we previously observed in this material enables direct, real-time observation of the propagation of an individual magnetic DW along multiprobe devices. We apply steady and pulsed magnetic fields, to trap and carefully position an individual DW within each separate device studied. This protocol reproducibly enables high-resolution magnetoresistance measurements across an individual wall. We consistently observe negative intrinsic DW resistance that scales with channel width. This appears to originate from sizeable quantum corrections to the magnetoresistance.

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Roukes, M. L.0000-0002-2916-6026
Additional Information:© 2004 Nature Publishing Group. Received 3 April 2004; Accepted 2 July 2004. We acknowledge support from DARPA/DSO and AFOSR. We thank A.H. MacDonald for discussions.
Funding AgencyGrant Number
Defense Advanced Research Projects Agency (DARPA)UNSPECIFIED
Air Force Office of Scientific Research (AFOSR)UNSPECIFIED
Issue or Number:7004
Record Number:CaltechAUTHORS:20150401-103447500
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:56280
Deposited By: Tony Diaz
Deposited On:01 Apr 2015 19:23
Last Modified:10 Nov 2021 20:57

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