Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1591905 | Solid State Communications | 2014 | 4 Pages |
Abstract
We grew grains of type-B ferromagnetic MnAs films on undoped GaAs (001) substrates and investigated the magnetic and structural properties of MnAs films grown by molecular beam epitaxy (MBE) at different thickness (10-250Â nm). The type-B MnAs grains with different size and eccentricity are grown by controling of growth condition with fast growth rate, optimization of beam equivalent pressure (BEP) ratio and thickness. The size and eccentricity of MnAs grains are increased with increasing thickness. The values of coercive field (Hc) are increased from 240Â Oe at 10Â nm to 630Â Oe at 90Â nm and then decreased from 618Â Oe at 180Â nm to 177Â Oe at 250Â nm. The in-plane magnetic anisotropy with increasing of thickness is decreased due to decrease in the magnetic anisotropy, induced by an increase in eccentricity of the MnAs grains. Consequently, we can control the magnetic properties of type-B MnAs thin films by controlling of grain size and morphology.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Hyounjong Kim, Gemechu Deressa, Hyoungseak Jeong, Jongsu Kim,