Title :
Magnetic Reversal Observation in Nano-Crystalline Nd-Fe-B Magnet by SANS
Author :
Yano, M. ; Ono, K. ; Manabe, A. ; Miyamoto, N. ; Shoji, T. ; Kato, A. ; Kaneko, Y. ; Harada, M. ; Nozaki, H. ; Kohlbrecher, J.
Author_Institution :
Adv. Mater. Eng. Div., Toyota Motor Corp., Susono, Japan
Abstract :
Spin-polarized small-angle neutron scattering (Pol-SANS) measurements for nano-crystalline Nd-Fe-B magnet have been performed in order to clarify the magnetic reversal behavior. Due to high transparency of neutron beam, magnetic and nuclear microstructures in the `bulk´ can be observed by SANS. Obtained SANS patterns arising from magnetic domain changes were analyzed by Teubner-Stray model, phenomenological correlation length model, to quantify the periodicity, density and morphology of magnetic domains. The results indicate that magnetic reversal evolves with magnetic domains which have the similar size of the grains. However, even in nano-crystalline system, single domain grain reversal is not realized.
Keywords :
boron alloys; crystal morphology; density; electron spin polarisation; grain size; iron alloys; magnetic domains; magnetisation reversal; nanomagnetics; nanostructured materials; neodymium alloys; neutron diffraction; transparency; NdFeB; Teubner-Stray model; density; grain size; magnetic domain; magnetic microstructures; magnetic reversal; morphology; nanocrystalline magnet; neutron beam; nuclear microstructures; periodicity; phenomenological correlation length model; spin-polarized small-angle neutron scattering; transparency; Magnetic domain walls; Magnetic domains; Magnetic resonance imaging; Magnetometers; Perpendicular magnetic anisotropy; Saturation magnetization; Coercive force; magnetic domains; neodymium compounds; neutron;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2012.2206574
