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

Kumar, Sandeep LU ; Paschoal, Waldomiro LU ; Johannes, Andreas; Jacobsson, Daniel LU ; Borschel, Christian; Pertsova, Anna; Wang, Chih-Han; Wu, Maw-Kuen; Canali, Carlo M and Ronning, Carsten, et al. (2013) In Nano Letters 13(11). p.5079-5084
Abstract
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.
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type
Contribution to journal
publication status
published
subject
in
Nano Letters
volume
13
issue
11
pages
5079 - 5084
publisher
The American Chemical Society
external identifiers
  • wos:000327111700014
  • pmid:24093475
  • scopus:84887830532
ISSN
1530-6992
DOI
10.1021/nl402229r
language
English
LU publication?
yes
id
a4a225ab-6940-4052-b699-4b32cece827e (old id 4143690)
date added to LUP
2013-11-08 13:49:15
date last changed
2019-03-05 01:06:02
@article{a4a225ab-6940-4052-b699-4b32cece827e,
  abstract     = {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.},
  author       = {Kumar, Sandeep and Paschoal, Waldomiro and Johannes, Andreas and Jacobsson, Daniel and Borschel, Christian and Pertsova, Anna and Wang, Chih-Han and Wu, Maw-Kuen and Canali, Carlo M and Ronning, Carsten and Samuelson, Lars and Pettersson, Håkan},
  issn         = {1530-6992},
  language     = {eng},
  number       = {11},
  pages        = {5079--5084},
  publisher    = {The American Chemical Society},
  series       = {Nano Letters},
  title        = {Magnetic Polarons and Large Negative Magnetoresistance in GaAs Nanowires Implanted with Mn Ions.},
  url          = {http://dx.doi.org/10.1021/nl402229r},
  volume       = {13},
  year         = {2013},
}