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Effect of Magnetic Field on the Magnetic Domain Structure of MnAs Film on GaAs

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10 Author(s)
J. B. Kim ; Quantum Photonic Sci. Res. Center & Dept. of Phys., Hanyang Univ., Seoul ; Y. P. Lee ; K. S. Ryu ; S. C. Shin
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We have observed the magnetic domain evolution under an external magnetic field in an epitaxial MnAs film on GaAs(001) by magnetic force microscopy. Owing to the strain involved, the ferromagnetic alpha-MnAs and the paramagnetic beta-MnAs phases coexist as self-aligned stripes at room temperature. It was found that a complex magnetic domain structure appeared in the ferromagnetic alpha-phase region at the demagnetized state (H=0 Oe). As the magnetic field increased, the magnetic domain structure was gradually changed, and reached a completely saturated state at H=600 Oe. Especially, at H=300 Oe, the observed magnetic domain wall distribution is well matched with the topographical shape

Published in:

IEEE Transactions on Magnetics  (Volume:42 ,  Issue: 10 )