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Temperature dependence of magnetization in GaMnAs film with critical strain
Department of Physics, Korea University.
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2009 (English)In: Solid State Communications, ISSN 0038-1098, E-ISSN 1879-2766, Vol. 149, no 31-32, 1300-1303 p.Article in journal (Refereed) Published
Abstract [en]

The temperature dependence of the magnetization properties of GaMnAs film, in which the strain was controlled to be in a critical condition by inserting a thin InGaAs layer, has been investigated by Hall measurements. The Hall resistance obtained with the magnetic fields perpendicular to the sample plane showed a slanted hysteresis, indicating the coexistence of in-plane and out-of-plane components of magnetization. The magnetic anisotropy fields of the sample were obtained from the angle dependence of the Hall resistance measurements. Using the magnetic anisotropy fields, the three-dimensional magnetic free energy diagrams were constructed for several temperatures. All energy diagrams show six energy minima along or near 〈 100 〉 directions, implying the possibility of magnetization within the plane and/or along out-of-plane directions in the system. Though the energy minima presented in the film plane (i.e., within the (001) plane) are deeper than those appeared along the out-of-plane direction (i.e., along the [001] direction) at 10 K, the situation is reversed as the temperature increases. This change of free energy density results in the temperature dependence of the magnetization directions in GaMnAs film with critical strain condition.

Place, publisher, year, edition, pages
2009. Vol. 149, no 31-32, 1300-1303 p.
Keyword [en]
A. Ferromagnetism, A. Semiconductor, D. Anisotropy, E. Planar Hall effect, Angle dependence, Critical condition, Critical strains, Energy diagram, Energy minima, Film planes, Free energy density, Hall measurements, Hall resistance, In-plane, Magnetic anisotropy field, Magnetic free energy, Magnetization direction, Magnetization property, Out-of-plane components, Out-of-plane direction, Temperature dependence, Temperature increase, Ferromagnetism, Free energy, Gallium alloys, Gyrators, Hall effect, Magnetic field effects, Magnetization, Magnets, Temperature distribution, Magnetic anisotropy
National Category
Condensed Matter Physics
URN: urn:nbn:se:kth:diva-105582DOI: 10.1016/j.ssc.2009.05.006ISI: 000268505700016OAI: diva2:574459

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Available from: 2012-12-05 Created: 2012-11-22 Last updated: 2013-07-19Bibliographically approved

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