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http://dx.doi.org/10.4283/JKMS.2009.19.4.126

Magnetic Properties of Heteroepitaxial MnAs Thin Films and Their Post-growth Annealing Effects  

Song, J.H. (Department of Physics, Chungnam National University)
J.B., Ketterson (Department of Physics and Astronomy and Material Research Center, Northwestern University)
Publication Information
Journal of the Korean Magnetics Society / v.19, no.4, 2009 , pp. 126-132 More about this Journal
Abstract
We have studied physical properties of MnAs thin films grown by Molecular-Beam Epitaxy as well as their post-growth annealing effects. The samples grown at $600^{\circ}C$ show the preferred crystal orientation of type-B independent of substrate whereas type-A is observed for the samples grown at below $200^{\circ}C$. The sample grown at $600^{\circ}C$ on GaAs(001) substrate is magnetized to only one direction even on the easy axis of magnetization. The magnetic properties are vastly enhanced after post-growth annealing for both MnAs/Si(001) sample with no ferromagnetism and ferromagnetic MnAs/GaAs(001) grown at $200^{\circ}C$.
Keywords
MnAs; spin polarization; spin injection; ferromagnetism;
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