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Magnetic Polarons and Large Negative Magnetoresistance in GaAs Nanowires Implanted with Mn Ions.

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Author

  • Sandeep Kumar
  • Waldomiro Paschoal
  • Andreas Johannes
  • Daniel Jacobsson
  • Christian Borschel
  • Anna Pertsova
  • Chih-Han Wang
  • Maw-Kuen Wu
  • Carlo M Canali
  • Carsten Ronning
  • Lars Samuelson
  • Håkan Pettersson
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Summary, in English

We report on low-temperature magnetotransport and SQUID measurements on heavily doped Mn-implanted GaAs nanowires. SQUID data recorded at low magnetic fields exhibit clear signs of the onset of a spin-glass phase with a transition temperature of about 16 K. Magnetotransport experiments reveal a corresponding peak in resistance at 16 K and a large negative magnetoresistance, reaching 40% at 1.6 K and 8 T. The negative magnetoresistance decreases at elevated temperatures and vanishes at about 100 K. We interpret our transport data in terms of spin-dependent hopping in a complex magnetic nanowire landscape of magnetic polarons, separated by intermediate regions of Mn impurity spins, forming a paramagnetic/spin-glass phase.

Publishing year

2013

Language

English

Pages

5079-5084

Publication/Series

Nano Letters

Volume

13

Issue

11

Document type

Journal article

Publisher

The American Chemical Society (ACS)

Topic

  • Nano Technology

Status

Published

ISBN/ISSN/Other

  • ISSN: 1530-6992