Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2003-08-19
Phys. rev. Lett. 91, 216602, (2003)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
4 pages, 3 figures, submited to Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.91.216602
We have fabricated (Ga,Mn)As nanostructures in which domain walls can be pinned by sub-10 nm constrictions. Controlled by shape anisotropy, we can switch the regions on either side of the constriction to either parallel or antiparallel magnetization. All samples exhibit a positive magnetoresistance, consistent with domain-wall trapping. For metallic samples we find a magnetoresistance up to 8%, which can be understood from spin accumulation. In samples where, due to depletion at the constriction, a tunnel barrier is formed, we observe a magnetoresistance of up to 2000 %.
Borzenko T.
Flatte' Michael E.
Furdyna Jacek K.
Gould Charles
Liu Xiandong
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