Galvanomagnetic methods of Curie temperature determination in (Ga,Mn)As
(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.
(Less)
- author
- Kwiatkowski, Adam ; Gryglas-Borysiewicz, Marta ; Juszyński, Piotr ; Przybytek, Jacek ; Sawicki, Maciej ; Sadowski, Janusz LU ; Wasik, Dariusz and Baj, Michał
- organization
- publishing date
- 2018-12-01
- 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}}, }