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Magnetic domain observation of Nd-Fe-B magnets with submicron-sized grains by high-resolution Kerr microscopy.
- Source :
-
Journal of Applied Physics . Apr2011, Vol. 109 Issue 7, p07A709-07A709-3. 1p. - Publication Year :
- 2011
-
Abstract
- A Kerr microscope that uses UV light for high-resolution observation of magnetic domains was developed, and the domain structure and magnetization process of hot-pressed magnets prepared from hydrogenation-disproportionation-desorption-recombination (HDDR) processed powders were examined. This microscope is capable of distinguishing nanometer-sized domain patterns. The coercivity of the hot-pressed HDDR magnet depends on the area of magnetization reversal during a reversal process. Magnetization reversal occurs simultaneously in a few grains in a low-coercivity magnet because the Nd-rich phase along the grain boundaries is absent. In contrast, in a high-coercivity magnet, magnetization reversal in a grain independently occurs because of an adequate Nd-rich phase along the grain boundaries. It follows that the high coercivity of an HDDR powder compacted by hot pressing is due to domain wall pinning at the grain boundaries. [ABSTRACT FROM AUTHOR]
- Subjects :
- *MAGNETIZATION
*HYDROGENATION
*MAGNETIC moments
*MAGNETIC properties
*MAGNETS
Subjects
Details
- Language :
- English
- ISSN :
- 00218979
- Volume :
- 109
- Issue :
- 7
- Database :
- Academic Search Index
- Journal :
- Journal of Applied Physics
- Publication Type :
- Academic Journal
- Accession number :
- 86445212
- Full Text :
- https://doi.org/10.1063/1.3549610