DETERMINATION OF THE DOMAIN WALL ENERGY AND THE EXCHANGE CONSTANT FROM HYSTERESIS IN FERRIMAGNETIC POLYCRYSTALS

1977 ◽  
Vol 38 (C1) ◽  
pp. C1-157-C1-162 ◽  
Author(s):  
M. GUYOT ◽  
A. GLOBUS
Keyword(s):  
Domain Wall ◽  
Exchange Constant ◽  
Domain Wall Energy

Determination of Intrinsic Magnetic Parameters of SmCo5 Phase in Sintered Samples

2005 ◽  
Vol 498-499 ◽  
pp. 129-133 ◽  
Author(s):  
Marcos Flavio de Campos ◽  
Fernando José Gomes Landgraf
Keyword(s):  
Powder Metallurgy ◽  
Domain Wall ◽  
Kerr Effect ◽  
Critical Diameter ◽  
Optical Microscope ◽  
Domain Theory ◽  
Magnetic Domains ◽  
Magnetic Parameters ◽  
Intrinsic Parameters

SmCo5 magnets are usually produced by powder metallurgy route, including milling, compaction and orientation under magnetic field, sintering and heat treatment. The samples produced by powder metallurgy, with grain size around 10 μm, are ideal for determination of intrinsic parameters. The first step for determination of intrinsic magnetic parameters is obtaining images of domain structure in demagnetized samples. In the present study, the domain images were produced by means of Kerr effect, in a optical microscope. After the test of several etchings, Nital appears as the most appropriate for observation of magnetic domains by Kerr effect. Applying Stereology and Domain Theory, several intrinsic parameters of SmCo5 phase were determined: domain wall energy 120 erg/cm2, critical diameter for single domain particle size 2 μm and domain wall thickness 60 Å. In the case of SmCo5, and also other phases with high magnetocrystalline anisotropy, Domain Theory presents several advantages when compared with Micromagnetics.

DOMAIN WALL ENERGY IN Nd2Fe14B AND Pr2Fe14B COMPOUNDS

1985 ◽  
Vol 46 (C6) ◽  
pp. C6-309-C6-312
Author(s):  
R. Szymczak ◽  
E. Burzo ◽  
W. E. Wallace
Keyword(s):  
Domain Wall ◽  
Domain Wall Energy
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