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Remnant magnetoresistance effect at the intersection of two ferromagnetic (Ga,Mn)As nanowires

Författare:
  • Tomasz Andrearczyk
  • Tadeusz Wosinski
  • Tadeusz Figielski
  • Andrzej Makosa
  • Iwona Krogulec
  • Jerzy Wrobel
  • Janusz Sadowski (Dr)
Publiceringsår: 2011
Språk: Engelska
Sidor: 1587-1591
Publikation/Tidskrift/Serie: Physica status solidi (b)
Volym: 248
Nummer: 7
Dokumenttyp: Artikel
Förlag: Wiley-Blackwell Publishing, Inc

Sammanfattning

Cross-like nanostructures composed of two perpendicular ferromagnetic (Ga,Mn)As nanowires were fabricated using electron-beam lithography patterning. Nanostructures of different orientations with respect to the crystallographic axes of the parent (Ga,Mn)As epitaxial layer were studied. Electrical resistance of individual nanowires as a function of applied magnetic field were investigated at low temperatures. Low-field magnetoresistance (MR) of the nanowires exhibits hysteresis-like behaviour and related remnant resistance in zero magnetic field. These effects are explained in terms of magnetic domain walls (DWs) pinned at the wires intersection, which contribute to the wire resistance. The DW resistivity, which depends on the degree of spin misalignment in the wall, has been determined to be of the order of 1 Omega mu m(2). High-field MR has, in turn, allowed determining the lithography-induced anisotropy field for the nanowires of different crystallographic orientations. (C) 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Disputation

Nyckelord

  • Physics and Astronomy
  • domain walls
  • ferromagnetic semiconductors
  • GaMnAs
  • magnetoresistance
  • nanostructures

Övriga

Published
Yes
  • ISSN: 0370-1972

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