Anisotropic Sm2Fe17N3 sintered magnets without coercivity deterioration

Factors Governing the Coercivity of Sintered Anisotropic M Type Ferrite

Article published online by EDP Sciences and available at http://dx.doi.org/10.1051/jphyscol:1985664 C6-35 0 JOURNAL DE PHYSIQUE I 1 THEORY We cons ide r a s i n t e r e d a n i s o t r o p i c M f e r r i t e having a c r y s t a l l i t e s i z e o f about 1 v m and a demagnetization curve wi th a s h a r p knee i n t h e h d quadrant.We s h a l l concen t ra t e on f a c t o r s governing t ...

Coercivity enhancement of Nd-Fe-B sintered magnets by grain boundary modification via reduction-diffusion process

The interface between the Nd2Fe14B particles and the grain boundary surrounding them in Nd-Fe-B sintered magnets was modified by diffusion Dy metal selectively through the grain boundary involving the reduction of Dy2O3 or DyF3 with CaH2 and the coercivity of them was effectively enhanced from 0.98 MA/m to 1.42 MA/m with keeping the high value of remanence. The resultant coercivity was higher t...

Relation between domain wall motion and coercivity in Nd-Fe-B sintered magnets prepared in various conditions

For the study of the relationship between the domain wall motion (DWM) and the coercivity in the samples of Dy-free Nd-Fe-B sintered magnets, the DC susceptibility (χDC) in the initial magnetization from the thermally demagnetized state and the DWM in the partially demagnetized state after the full magnetization in 5T-pulse field were measured. In the high coercivity (μ0Hc) samples of μ0Hc=1.35...

COERCIVITY AND THERMAL REMAGNETIZATION OF SINTERED Nd-Fe-B

Statistical methods are used to estimate coercivity J Hc and thermal remagnetization of uniaxially nucleationcontrolled permanent magnetic materials. Sintered Nd-Fe-B consists of the tetragonal magnetic Nd2FelrB phase with a volume fraction w = 80 % and of nonmagnetic phases. At temperatures above T, rz 150 K the tetragonal axis is the easy direction of magnetization [I]. It is well known [2] t...

Giant coercivity of dense nanostructured spark plasma sintered barium hexaferrite