Surface domain structure and local demagnetizing field in NdFeB permanent magnets

1994 ◽  
Vol 142 (1) ◽  
pp. K41-K45 ◽  
Author(s):  
Yu. G. Pastushenkov ◽  
L. E. Afanasieva ◽  
R. M. Grechishkin
Keyword(s):  
Domain Structure ◽  
Permanent Magnets ◽  
Demagnetizing Field

Magnetic-domain structure of Nd2Fe14B permanent magnets

1998 ◽  
Vol 84 (6) ◽  
pp. 3267-3272 ◽  
Author(s):  
Yimei Zhu ◽  
M. R. McCartney
Keyword(s):  
Domain Structure ◽  
Permanent Magnets ◽  
Magnetic Domain ◽  
Magnetic Domain Structure

Magnetic Anisotropy of Sm(Co0.68Fe0.22Cu0.08Zr0.02)7.7 Ribbons Produced by Melt Spinning

2002 ◽  
Vol 17 (3) ◽  
pp. 648-652 ◽  
Author(s):  
A-Ru Yan ◽  
Zhi-Gang Sun ◽  
Baoshan Han ◽  
Bao-Gen Shen
Keyword(s):  
Magnetic Anisotropy ◽  
Domain Structure ◽  
Melt Spinning ◽  
Permanent Magnets ◽  
Dendritic Structure ◽  
Axis Orientation ◽  
Needle Size ◽  
Ribbon Plane ◽  
Field Parallel ◽  
Melt Spun

A high degree of texture was observed in melt-spun Sm(Co0.68Fe0.22Cu0.08Zr0.02)7.7 ribbons prepared by single-roller melt spinning at low wheel speed; their easy magnetization axis was parallel to the ribbon plane. Magnetization studies showed an obvious magnetic anisotropy and a 90% higher remanance in ribbons for the field parallel to the longitudinal direction (8.5 kGs) than that for the field parallel to the wide direction (4.4 kGs); this was attributed to a dendritic structure of needle-size grains (2–3 × 10–40 μm) with their long axis parallel to the ribbon plane. This texture allowed the development of a new process for producing anisotropic permanent magnets. The domain structure was studied by magnetic-force microscope. A highly ordered and strip-shaped magnetic domain structure was observed on the surface of the ribbons. This was due to the preference for tetragonal c-axis orientation parallel to the surface of melt-spun ribbons. We calculated the domain wall energy γ and critical single-domain particle size Dc of Sm(Co0.68Fe0.22Cu0.08Zr0.02)7.7 ribbons.

scholarly journals Efficient methods for macroscopic magnetization simulation described by the assembly of simplified domain structure models

2015 ◽  
Vol 4 (1) ◽  
pp. 16 ◽  
Author(s):  
T. Matsuo ◽  
T. Nakamura ◽  
S. Ito ◽  
T. Mifune ◽  
C. Kaido
Keyword(s):  
Equilibrium Point ◽  
Domain Structure ◽  
Efficient Method ◽  
Computation Time ◽  
Structure Model ◽  
Fast Computation ◽  
Demagnetizing Field ◽  
Searching Method

This article presents two methods for the fast computation of macroscopic magnetization model called assembled domain structure model. First, an efficient method for computing the demagnetizing field is proposed. Secondly, a direct searching method of equilibrium point is developed, which greatly reduces the computation time.

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