Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

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

Kumar, Sandeep LU ; Paschoal, Waldomiro LU ; Johannes, Andreas ; Jacobsson, Daniel LU orcid ; 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.
Please use this url to cite or link to this publication:
author
; ; ; ; ; ; ; ; and , et al. (More)
; ; ; ; ; ; ; ; ; ; and (Less)
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Nano Letters
volume
13
issue
11
pages
5079 - 5084
publisher
The American Chemical Society (ACS)
external identifiers
  • wos:000327111700014
  • pmid:24093475
  • scopus:84887830532
  • pmid:24093475
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
2016-04-01 10:02:13
date last changed
2025-10-14 09:11:55
@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 (ACS)}},
  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}},
  doi          = {{10.1021/nl402229r}},
  volume       = {{13}},
  year         = {{2013}},
}