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

Nature
H X TangM L Roukes

Abstract

Magnetic domains, and the boundaries that separate them (domain walls, DWs), play a central role in the science of magnetism. 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. W...Continue Reading

References

Apr 1, 1996·Physical Review. B, Condensed Matter·M ViretJ F Gregg
Sep 16, 2000·Physical Review Letters·L KleinA Kapitulnik
Oct 4, 2000·Physical Review Letters·U EbelsK Ounadjela
Oct 21, 2000·Physical Review Letters·M ViretC Fermon
Nov 17, 2001·Science·S A WolfD M Treger
Apr 17, 2002·Physical Review Letters·R DanneauM Viret
Jun 18, 2002·Science·D A AllwoodR P Cowburn
Apr 12, 2003·Physical Review Letters·H X TangM L Roukes
May 7, 2003·Physical Review Letters·U WelpT Wojtowicz

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Citations

Apr 12, 2006·Physical Review Letters·D ChibaH Ohno
May 16, 2007·Physical Review Letters·R JaramilloZ Cai
Sep 10, 2011·Physical Review Letters·A L BalkN Samarth
Oct 10, 2006·Physical Review Letters·Anh Kiet NguyenArne Brataas

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