Reference : Magnetic domains and annealing-induced magnetic anisotropy in nanocrystalline soft ma...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
http://hdl.handle.net/10993/537
Magnetic domains and annealing-induced magnetic anisotropy in nanocrystalline soft magnetic materials
English
Suzuki, K. [Department of Materials Engineering, Monash University, Clayton, Australia]
Ito, N. [> >]
Saranu, S. [> >]
Herr, U. [> >]
Michels, Andreas mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit >]
Garitaonandia, J. S. [> >]
2008
Journal of Applied Physics
American Institute of Physics
103
7
7301-7303
Yes (verified by ORBilu)
0021-8979
Melville
NY
[en] boron alloys ; coercive force ; ferromagnetic materials ; iron alloys ; Kerr magneto-optical effect ; magnetic anisotropy ; magnetic annealing, magnetic domains ; nanostructured materials ; niobium alloys ; soft magnetic materials
[en] The magnetic domains of nanocrystalline Fe84Nb6B10 annealed under static and rotating magnetic fields have been investigated by means of magneto-optical Kerr effect (MOKE) microscopy in order to clarify the origin of the dramatic magnetic softening brought about by rotating field annealing. The coercivity (Hc) values after static- and rotating-magnetic field annealings are 5.9 and 3.0  A/m, respectively. The MOKE image after static field annealing implies a highly coherent uniaxial anisotropy (Ku) in the sample whereas no sign of such a strong Ku is evident in the domain configuration after rotating field annealing. Our analytical solution of the random anisotropy model with additional Ku predicts that the fluctuating amplitude of the effective anisotropy (δK) in nanocrystalline Fe84Nb6B10 decreases from 20 to 11 J/m3 by removing Ku. The observed reduction of Hc may be attributed to this decrease in δK induced by rotating field annealing.
http://hdl.handle.net/10993/537
10.1063/1.2835068

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