Annealing effect on magnetic anisotropy in ultrathin (Ga,Mn)As

We investigated the effect of low temperature annealing on magnetic anisotropy in 7-nm ultrathin Ga sub(0.94)Mn sub(0.06)As devices by measuring the angle-dependent planar Hall resistance (PHR). Obvious hysteresis loops were observed during the magnetization reversal through the clockwise and counte...

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Bibliographic Details
Published in:Chinese physics B 2013-02, Vol.22 (2), p.27504-1-027504-5
Main Authors: Li, Yan-Yong, Wang, Hua-Feng, Cao, Yu-Fei, Wang, Kai-You
Format: Article
Language:English
Subjects:
Anisotropy
Annealing
Devices
Ferromagnetism
Hysteresis loops
Magnetic anisotropy
Magnetic fields
Measuring instruments
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Summary:We investigated the effect of low temperature annealing on magnetic anisotropy in 7-nm ultrathin Ga sub(0.94)Mn sub(0.06)As devices by measuring the angle-dependent planar Hall resistance (PHR). Obvious hysteresis loops were observed during the magnetization reversal through the clockwise and counterclockwise rotations under low magnetic fields (below 1000 Gs, 1 Gs = 10 super(-4) T), which can be explained by competition between Zeeman energy and magnetic anisotropic energy. It is found that the uniaxial anisotropy is dominant in the whole measured ferromagnetic range for both the as-grown ultrathin Ga sub(0.94)Mn sub(0.06)As and the annealed one. The cubic anisotropy changes more than the uniaxial anisotropy in the measured temperature ranges after annealing. This gives a useful way to tune the magnetic anisotropy of ultrathin (Ga,Mn)As devices.
ISSN:1674-1056
1741-4199
DOI:10.1088/1674-1056/22/2/027504