Title :
Analysis of Magnetization Reversal Process of Nd–Fe–B Sintered Magnets by Magnetic Domain Observation Using Kerr Microscope
Author :
Takezawa, Masaaki ; Kimura, Yuichi ; Morimoto, Yuuki ; Yamasaki, Jiro
Author_Institution :
Dept. of Appl. Sci. for Integrated Syst. Eng., Kyusyu Inst. of Technol., Kitakyushu, Japan
Abstract :
We used a Kerr microscope, image processing, and photo editing to clarify magnetization reversal and its propagation in a sintered Nd-Fe-B magnet. Magnetic domain change was observed when a dc field from +20 to 20 kOe was applied to a sintered Nd-Fe-B magnet. Simultaneous magnetization reversal in several grains along the easy axis direction and its propagation to neighboring grains occurred. This indicates that the nucleation field in a grain and magnetic interaction between grains are important controlling factors of the coercivity of sintered Nd-Fe-B magnets.
Keywords :
Kerr magneto-optical effect; boron alloys; coercive force; grain size; image processing; iron alloys; magnetic domains; magnetisation reversal; neodymium alloys; nucleation; sintering; Kerr microscopy; NdFeB; coercivity; grain size; image processing; magnetic domain; magnetic interaction; magnetization reversal; nucleation field; photoediting; sintered magnets; Magnetic domain walls; Magnetic domains; Magnetic force microscopy; Magnetic resonance imaging; Magnetization reversal; Magnetostatics; Microscopy; Domain structure; Kerr microscope; image processing; sintered Nd–Fe–B magnet;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2013.2241748
