Determination of the Domain Wall Energy from Initial Magnetization Curve in Ferrimagnetic Polycrystals

1974 ◽  
Author(s):  
M. Guyot ◽  
A. Globus
Keyword(s):  
Domain Wall ◽  
Magnetization Curve ◽  
Domain Wall Energy ◽  
Initial Magnetization

Measurement of Magnetically Induced Stress as a Means of Determining Magnetization Characteristics of Mild Steel

1992 ◽  
Vol 29 (4) ◽  
pp. 339-353
Author(s):  
K. Turvey ◽  
T. Turvey
Keyword(s):  
Mild Steel ◽  
Hysteresis Loop ◽  
Standard Method ◽  
Magnetization Curve ◽  
Attractive Force ◽  
Induced Stress ◽  
Initial Magnetization ◽  
Good Agreement

Measurement of magnetically induced stress as a means of determining magnetization characteristics of mild steel The magnetic major hysteresis loop and the initial magnetization curve are obtained for mild steel from measurements of the attractive force between magnetized semi-rings. A check determination of the hysteresis loop using a standard method yields good agreement.

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.

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