Thickness dependence of the magnetic properties of MnAs films on GaAs(001) and GaAs(113)A: Role of a natural array of ferromagnetic stripes

Systematic studies of as-grown MnAs films deposited by molecular-beam epitaxy on GaAs(001) and GaAs(113)A reveal that their magnetic properties and, in particular, their saturation magnetization are determined by the phase separation into stripes of ferromagnetic α-MnAs and paramagnetic β-MnAs. Usin...

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Bibliographic Details
Published in:Journal of applied physics 2004-11, Vol.96 (9), p.5056-5062
Main Authors: Däweritz, L., Wan, L., Jenichen, B., Herrmann, C., Mohanty, J., Trampert, A., Ploog, K. H.
Format: Article
Language:English
Subjects:
CRYSTAL GROWTH
ELECTRON DIFFRACTION
FERROMAGNETIC MATERIALS
GALLIUM ARSENIDES
HYSTERESIS
INTERFACES
LAYERS
MAGNETIC PROPERTIES
MAGNETIC SEMICONDUCTORS
MAGNETIZATION
MANGANESE ARSENIDES
MATERIALS SCIENCE
MOLECULAR BEAM EPITAXY
PARAMAGNETISM
REFLECTION
SATURATION
TEMPERATURE RANGE 0273-0400 K
THICKNESS
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Summary:Systematic studies of as-grown MnAs films deposited by molecular-beam epitaxy on GaAs(001) and GaAs(113)A reveal that their magnetic properties and, in particular, their saturation magnetization are determined by the phase separation into stripes of ferromagnetic α-MnAs and paramagnetic β-MnAs. Using a specific saturation magnetization MS*, which refers to the actual volume of α-MnAs, the thickness dependence of MS* can be described in a universal way. It is due to the variation of the stripe structure and the changing of the intra- and interstripe magnetic interaction. Values well above ∼1100emu∕cm3, obtained for the optimum film thickness at room temperature, are considered as an intrinsic property of a nearly defect-free MnAs in the fully magnetized state.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.1790576