Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1802928 | Journal of Magnetism and Magnetic Materials | 2009 | 5 Pages |
Abstract
The structural and magnetic properties of epitaxial In1âxMnxAs1âyPy quaternary layers with Mn content ranging from 0.01 to 0.04 and phosphorous content ranging from 0.11 to 0.21 were studied. X-ray diffraction indicated that the films were two phase consisting of an InMnAsP solid solution and hexagonal MnAs nanoprecipitates. Addition of phosphorus promoted precipitate formation. Films were ferromagnetic showing hysteretic behavior in the field dependence of magnetization at 5 and 298Â K. From field-cooled magnetization measurements ferromagnetic transitions were observed at 280 and 325Â K. The zero field-cooled magnetization versus temperature measurements showed irreversibility for T<300Â K that was attributed to the presence of MnAs nanoprecipitates. The calculated coercivity using the Neel model was 1380Â G compared to the experimental value of 380Â G at 5Â K. The difference was attributed to a strong inter-cluster exchange that stabilizes the ferromagnetic state.
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Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
N.D. Parashar, P.T. Chiu, B.W. Wessels,