The Microwave Magneto‐Kerr Effect in Silicon and Germanium. II. Determination of Relaxation Time and Effective Mass

1968 ◽  
Vol 39 (9) ◽  
pp. 4099-4106 ◽  
Author(s):  
Peter S. Hauge ◽  
Keith S. Champlin
Keyword(s):  
Relaxation Time ◽  
Effective Mass ◽  
Kerr Effect ◽  
Silicon And Germanium

Plasma Edge Reflectance Measurements in GaxIn(1−x)As and InAsxSb(1−x) Alloys

1971 ◽  
Vol 49 (15) ◽  
pp. 2052-2060 ◽  
Author(s):  
Mathew B. Thomas ◽  
John C. Woolley
Keyword(s):  
Experimental Data ◽  
Relaxation Time ◽  
Effective Mass ◽  
Conduction Band ◽  
Room Temperature ◽  
Plasma Edge ◽  
Electron Effective Mass ◽  
Reflectance Measurements ◽  
Type Conduction

Room temperature measurements of plasma reflectance have been made on polycrystalline homogeneous n type samples of GaxIn(1−x) As and InAsxSb(1−x) alloys. An analysis for the case of general degeneracy in a Kane-type conduction band has been developed, to allow the determination of electron effective mass (m0*/m) at the bottom of the conduction band. Hence values of m0*/m vs. x have been determined for both alloy systems. From the experimental data, values of relaxation time and optical mobility have also been calculated.

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.

Free carriers's effective mass and relaxation-time analysis by high-pulsed-field Faraday oscillations in III-V compounds

1976 ◽  
Vol 13 (6) ◽  
pp. 2576-2582 ◽  
Author(s):  
D. Julienne ◽  
F. Le Saos ◽  
A. Fortini ◽  
Ph. Bauduin
Keyword(s):  
Relaxation Time ◽  
Effective Mass ◽  
Time Analysis ◽  
Pulsed Field
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