Abstract
The magnetic anisotropy properties of GaMnAs ferromagnetic films have been investigated by using planar Hall effect measurements. The field scan of the planar Hall resistance (PHR) showed a two-step switching behavior indicating a strong cubic anisotropy along the 〈100〉 directions. The difference in the behaviors of the PHR for two applied field directions, [110] and [110], was understood via the well-known uniaxial anisotropy along the [110] direction. In addition to such known effects, we also found the presence of an asymmetry for the [010] and the [100] directions. This new asymmetry phenomenon was explained by introducing an additional uniaxial anisotropy field H u2 along the [100] and the [100] directions, which coincide with the two directions of cubic anisotropy. The values of the anisotropy fields, cubic (H c), first uniaxial (H u1), and second uniaxial (H u2), were obtained by analyzing the angle dependence of the PHR. Although the value of H u2 is small, its effect is clearly observed at high temperatures above 25 K, where the transition of the magnetization occurred before the field direction had been reversed during the magnetization reversal process.
| Original language | English |
|---|---|
| Pages (from-to) | 2099-2103 |
| Number of pages | 5 |
| Journal | Journal of the Korean Physical Society |
| Volume | 62 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - 2013 Jul 1 |
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Keywords
- Ferromagnetic semiconductor
- Magnetic anisotropy
- Planar Hall effect
ASJC Scopus subject areas
- Physics and Astronomy(all)
Cite this
Investigation of the magnetic anisotropy in ferromagnetic GaMnAs films by using the planar hall effect. / Won, Jaehyuk; Shin, Jinsik; Gwon, Yoonjung; Byeon, Hyehyeon; Lee, Sangyeop; Lee, Sang Hoon; Liu, X.; Furdyna, J. K.
In: Journal of the Korean Physical Society, Vol. 62, No. 12, 01.07.2013, p. 2099-2103.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Investigation of the magnetic anisotropy in ferromagnetic GaMnAs films by using the planar hall effect
AU - Won, Jaehyuk
AU - Shin, Jinsik
AU - Gwon, Yoonjung
AU - Byeon, Hyehyeon
AU - Lee, Sangyeop
AU - Lee, Sang Hoon
AU - Liu, X.
AU - Furdyna, J. K.
PY - 2013/7/1
Y1 - 2013/7/1
N2 - The magnetic anisotropy properties of GaMnAs ferromagnetic films have been investigated by using planar Hall effect measurements. The field scan of the planar Hall resistance (PHR) showed a two-step switching behavior indicating a strong cubic anisotropy along the 〈100〉 directions. The difference in the behaviors of the PHR for two applied field directions, [110] and [110], was understood via the well-known uniaxial anisotropy along the [110] direction. In addition to such known effects, we also found the presence of an asymmetry for the [010] and the [100] directions. This new asymmetry phenomenon was explained by introducing an additional uniaxial anisotropy field H u2 along the [100] and the [100] directions, which coincide with the two directions of cubic anisotropy. The values of the anisotropy fields, cubic (H c), first uniaxial (H u1), and second uniaxial (H u2), were obtained by analyzing the angle dependence of the PHR. Although the value of H u2 is small, its effect is clearly observed at high temperatures above 25 K, where the transition of the magnetization occurred before the field direction had been reversed during the magnetization reversal process.
AB - The magnetic anisotropy properties of GaMnAs ferromagnetic films have been investigated by using planar Hall effect measurements. The field scan of the planar Hall resistance (PHR) showed a two-step switching behavior indicating a strong cubic anisotropy along the 〈100〉 directions. The difference in the behaviors of the PHR for two applied field directions, [110] and [110], was understood via the well-known uniaxial anisotropy along the [110] direction. In addition to such known effects, we also found the presence of an asymmetry for the [010] and the [100] directions. This new asymmetry phenomenon was explained by introducing an additional uniaxial anisotropy field H u2 along the [100] and the [100] directions, which coincide with the two directions of cubic anisotropy. The values of the anisotropy fields, cubic (H c), first uniaxial (H u1), and second uniaxial (H u2), were obtained by analyzing the angle dependence of the PHR. Although the value of H u2 is small, its effect is clearly observed at high temperatures above 25 K, where the transition of the magnetization occurred before the field direction had been reversed during the magnetization reversal process.
KW - Ferromagnetic semiconductor
KW - Magnetic anisotropy
KW - Planar Hall effect
UR - http://www.scopus.com/inward/record.url?scp=84880026952&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84880026952&partnerID=8YFLogxK
U2 - 10.3938/jkps.62.2099
DO - 10.3938/jkps.62.2099
M3 - Article
VL - 62
SP - 2099
EP - 2103
JO - Journal of the Korean Physical Society
JF - Journal of the Korean Physical Society
SN - 0374-4884
IS - 12
ER -