FIELD DEPENDENCE OF THE SPIN REORIENTATION TEMPERATURE IN MICRO AND NANOCRYSTALLINE FORMS OF Nd{sub 2}Fe{sub 14}B.
Insight into the anisotropy behavior of Nd{sub 2}Fe{sub 14}B may be obtained by measurements of the spin reorientation temperature T{sub S} where the overall magnetocrystalline anisotropy changes to allow the magnetic moment to relax from an easy axis to an easy cone configuration. DC magnetization measurements made at various applied fields on sintered and nanocrystalline forms of Nd{sub 2}Fe{sub 14}B indicate a T{sub S} that remains constant for the sintered sample but is strongly field-dependent for the nanocrystalline forms of the material. Specifically, T{sub S} decreases with decreasing applied fields of strengths 5 T, 1 T and 0.01 T. A simple model that minimizes the total energy of the system leads to the conclusion that the spin reorientation temperature is insensitive to applied field. Therefore it is concluded that the apparent decrease in the system's spin reorientation temperatures with decrease in measuring field can be attributed to the nanoscale structure of the system and a difference in the anisotropy constants compared to their bulk values.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research (ER) (US)
- DOE Contract Number:
- AC02-98CH10886
- OSTI ID:
- 808778
- Report Number(s):
- BNL-71066-2003-CP; R&D Project: MA410MABA; KC0202020; TRN: US0302232
- Resource Relation:
- Conference: 17TH INTERNATIONAL WORKSHOP ON RARE EARTH MAGNETS AND THEIR APPLICATIONS, NEWARK, DE (US), 08/18/2002--08/22/2002; Other Information: PBD: 18 Aug 2002
- Country of Publication:
- United States
- Language:
- English
Similar Records
Structure and magnetic properties of Nd/sub 2/(Fe/sub 1-chi/Co/sub chi/)/sub 14/ B/sub 1-y/C/sub y/ alloys
Spin reorientation in melt-spun neodymium-iron-boron ribbons