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Galvanomagnetic methods of Curie temperature determination in (Ga,Mn)As

Kwiatkowski, Adam ; Gryglas-Borysiewicz, Marta ; Juszyński, Piotr ; Przybytek, Jacek ; Sawicki, Maciej ; Sadowski, Janusz LU ; Wasik, Dariusz and Baj, Michał (2018) In Journal of Magnetism and Magnetic Materials 467. p.120-128
Abstract

We critically discuss various experimental methods to determine Curie temperature TC of (Ga,Mn)As thin layers or other conducting magnetic materials by means of electric charge transport measurements. They all base on the influence of sample magnetization on the magnetoresistivity tensor ρ̂ and are an alternative to the method based upon an analysis of the temperature derivative of the sample resistance (Novák et al., 2008). These methods can be applied even when standard SQUID magnetometers are difficult or impossible to use – for example for extremely small samples or in the case of experiments performed at very specific physical conditions, e.g. at high hydrostatic pressure inside the clamp cell. We show that the use of... (More)

We critically discuss various experimental methods to determine Curie temperature TC of (Ga,Mn)As thin layers or other conducting magnetic materials by means of electric charge transport measurements. They all base on the influence of sample magnetization on the magnetoresistivity tensor ρ̂ and are an alternative to the method based upon an analysis of the temperature derivative of the sample resistance (Novák et al., 2008). These methods can be applied even when standard SQUID magnetometers are difficult or impossible to use – for example for extremely small samples or in the case of experiments performed at very specific physical conditions, e.g. at high hydrostatic pressure inside the clamp cell. We show that the use of the so called Arrott plot prepared with the use of high magnetic field isotherms ρxx(H0),ρxy(H0) (H0 – external magnetic field) may lead to substantial (of the order of 10 K) divergence of the obtained TC values depending on the assumptions which are necessary to make in this case and depending on the direction of a magnetic anisotropy easy axis. We also propose a number of ways how to obtain, basing on low magnetic field isotherms ρxx(H0),ρxy(H0), clear and characteristic features which are closely related to the ferromagnetic–paramagnetic phase transition.

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author
; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
(Ga,Mn)As, Curie-temperature, Ferromagnetic semiconductors
in
Journal of Magnetism and Magnetic Materials
volume
467
pages
9 pages
publisher
Elsevier
external identifiers
  • scopus:85050450667
ISSN
0304-8853
DOI
10.1016/j.jmmm.2018.07.049
language
English
LU publication?
yes
id
06e845fe-ed25-463d-9024-3d92ad13c5c9
date added to LUP
2018-08-14 14:19:29
date last changed
2023-03-23 10:09:09
@article{06e845fe-ed25-463d-9024-3d92ad13c5c9,
  abstract     = {{<p>We critically discuss various experimental methods to determine Curie temperature T<sub>C</sub> of (Ga,Mn)As thin layers or other conducting magnetic materials by means of electric charge transport measurements. They all base on the influence of sample magnetization on the magnetoresistivity tensor ρ̂ and are an alternative to the method based upon an analysis of the temperature derivative of the sample resistance (Novák et al., 2008). These methods can be applied even when standard SQUID magnetometers are difficult or impossible to use – for example for extremely small samples or in the case of experiments performed at very specific physical conditions, e.g. at high hydrostatic pressure inside the clamp cell. We show that the use of the so called Arrott plot prepared with the use of high magnetic field isotherms ρ<sub>xx</sub>(H<sub>0</sub>),ρ<sub>xy</sub>(H<sub>0</sub>) (H<sub>0</sub> – external magnetic field) may lead to substantial (of the order of 10 K) divergence of the obtained T<sub>C</sub> values depending on the assumptions which are necessary to make in this case and depending on the direction of a magnetic anisotropy easy axis. We also propose a number of ways how to obtain, basing on low magnetic field isotherms ρ<sub>xx</sub>(H<sub>0</sub>),ρ<sub>xy</sub>(H<sub>0</sub>), clear and characteristic features which are closely related to the ferromagnetic–paramagnetic phase transition.</p>}},
  author       = {{Kwiatkowski, Adam and Gryglas-Borysiewicz, Marta and Juszyński, Piotr and Przybytek, Jacek and Sawicki, Maciej and Sadowski, Janusz and Wasik, Dariusz and Baj, Michał}},
  issn         = {{0304-8853}},
  keywords     = {{(Ga,Mn)As; Curie-temperature; Ferromagnetic semiconductors}},
  language     = {{eng}},
  month        = {{12}},
  pages        = {{120--128}},
  publisher    = {{Elsevier}},
  series       = {{Journal of Magnetism and Magnetic Materials}},
  title        = {{Galvanomagnetic methods of Curie temperature determination in (Ga,Mn)As}},
  url          = {{http://dx.doi.org/10.1016/j.jmmm.2018.07.049}},
  doi          = {{10.1016/j.jmmm.2018.07.049}},
  volume       = {{467}},
  year         = {{2018}},
}