Advanced

Magnetic order in semiconducting, ferromagnetic Ga1-xMnxAs

Fedorych, OM; Wilamowski, Z; Potemski, M; Byszewski, M and Sadowski, Janusz LU (2004) In Semiconductor Science and Technology 19(4). p.492-493
Abstract
Magnetic resonance studies allow us to distinguish paramagnetic, ferromagnetic and ferrimagnetic phases in Ga1-xMnxAs. The transition from ferromagnet to ferrimagnet is correlated with a metal to insulator transition. The analysis of spin wave resonance spectra, which occur in the ferrimagnetic phase, allows us to estimate the magnitude and the distance dependence of exchange coupling. The experimentally evaluated long range of exchange causes an effective averaging of the fluctuation of exchange interactions. As a consequence, in the semimetallic phase both spin subsystems coherently precess forming the ferrimagnetic structure. In the insulating phase, fluctuations of the local exchange field lead to a fast decoherence of the carrier... (More)
Magnetic resonance studies allow us to distinguish paramagnetic, ferromagnetic and ferrimagnetic phases in Ga1-xMnxAs. The transition from ferromagnet to ferrimagnet is correlated with a metal to insulator transition. The analysis of spin wave resonance spectra, which occur in the ferrimagnetic phase, allows us to estimate the magnitude and the distance dependence of exchange coupling. The experimentally evaluated long range of exchange causes an effective averaging of the fluctuation of exchange interactions. As a consequence, in the semimetallic phase both spin subsystems coherently precess forming the ferrimagnetic structure. In the insulating phase, fluctuations of the local exchange field lead to a fast decoherence of the carrier spins and only the localized Mn spins form the ferromagnetic moment. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Semiconductor Science and Technology
volume
19
issue
4
pages
492 - 493
publisher
IOP Publishing
external identifiers
  • wos:000220860700163
  • scopus:1942516291
ISSN
0268-1242
DOI
10.1088/0268-1242/19/4/162
language
English
LU publication?
yes
id
d0041206-b374-48da-8f7f-e1b0ef4ea3b2 (old id 281093)
date added to LUP
2007-10-22 18:07:09
date last changed
2017-01-01 06:39:48
@article{d0041206-b374-48da-8f7f-e1b0ef4ea3b2,
  abstract     = {Magnetic resonance studies allow us to distinguish paramagnetic, ferromagnetic and ferrimagnetic phases in Ga1-xMnxAs. The transition from ferromagnet to ferrimagnet is correlated with a metal to insulator transition. The analysis of spin wave resonance spectra, which occur in the ferrimagnetic phase, allows us to estimate the magnitude and the distance dependence of exchange coupling. The experimentally evaluated long range of exchange causes an effective averaging of the fluctuation of exchange interactions. As a consequence, in the semimetallic phase both spin subsystems coherently precess forming the ferrimagnetic structure. In the insulating phase, fluctuations of the local exchange field lead to a fast decoherence of the carrier spins and only the localized Mn spins form the ferromagnetic moment.},
  author       = {Fedorych, OM and Wilamowski, Z and Potemski, M and Byszewski, M and Sadowski, Janusz},
  issn         = {0268-1242},
  language     = {eng},
  number       = {4},
  pages        = {492--493},
  publisher    = {IOP Publishing},
  series       = {Semiconductor Science and Technology},
  title        = {Magnetic order in semiconducting, ferromagnetic Ga1-xMnxAs},
  url          = {http://dx.doi.org/10.1088/0268-1242/19/4/162},
  volume       = {19},
  year         = {2004},
}