Magnetic-field effect on sound propagation as a probe of electronic structure and electron interaction in an itinerant-electron ferromagnet

1995 ◽  
Vol 52 (9) ◽  
pp. 6588-6595 ◽  
Author(s):  
D. J. Kim ◽  
Ikuya Yoshida
Keyword(s):  
Magnetic Field ◽  
Electronic Structure ◽  
Field Effect ◽  
Sound Propagation ◽  
Magnetic Field Effect ◽  
Electron Interaction ◽  
Itinerant Electron

MAGNETIC FIELD EFFECT ON SOUND VELOCITY AND ATTENUATION IN AN ITINERANT ELECTRON FERROMAGNET

1993 ◽  
Vol 07 (01n03) ◽  
pp. 605-608
Author(s):  
D.J. KIM ◽  
Ikuya YOSHIDA
Keyword(s):  
Magnetic Field ◽  
Electronic Structure ◽  
Numerical Calculation ◽  
Sound Velocity ◽  
Field Effect ◽  
Magnetic Field Effect ◽  
Electron Interaction ◽  
Itinerant Electron ◽  
Magnetic Field Effects ◽  
Field Effects

In this paper we present the result of a systematic numerical calculation on the temperature dependence of magnetic field effects on the velocity and attenuation constant of longitudinal acoustic sound for both T<Tc and T>Tc of an itinerant electron ferromagnet. Attributing the origin of these magnetic field effects to the change in the screening of the ion-ion interaction which is caused by a magnetic field, first we reformulate this problem in a unified way. Then we make numerical calculation with a simple model electronic density of states and see how sensitively the sign, size, and temperature variation of these magnetic field effects depend on the details of electronic structure and electron interaction. We find that these magnetic field effects can be very strongly exchange enhanced. These findings suggest the possibility of using such magnetic field effects as a probe of the electronic structure and electron interaction in an itinerant electron ferromagnet. Finally we point out that by measuring the magnetic field effect on sound velocity we can infer the effect of the electron-phonon interaction on the magnetic properties.

The Model for Calculation the Hall Effect Parameter

2004 ◽  
Vol 9 (2) ◽  
pp. 129-138
Author(s):  
J. Kleiza ◽  
V. Kleiza
Keyword(s):  
Magnetic Field ◽  
Field Effect ◽  
Magnetic Field Effect ◽  
Mapping Method ◽  
Sample Thickness ◽  
System Of Nonlinear Equations ◽  
Specific Resistivity ◽  
Conformal Mapping Method ◽  
Effect Parameter ◽  
The Magnetic Field

A method for calculating the values of specific resistivity ρ as well as the product µHB of the Hall mobility and magnetic induction on a conductive sample of an arbitrary geometric configuration with two arbitrary fitted current electrodes of nonzero length and has been proposed an grounded. During the experiment, under the constant value U of voltage and in the absence of the magnetic field effect (B = 0) on the sample, the current intensities I(0), IE(0) are measured as well as the mentioned parameters under the effect of magnetic fields B1, B2 (B1 ≠ B2), i.e.: IE(β(i)), I(β(i)), i = 1, 2. It has been proved that under the constant difference of potentials U and sample thickness d, the parameters I(0), IE(0) and IE(β(i)), I(β(i)), i = 1, 2 uniquely determines the values of the product µHB and specific resistivity ρ of the sample. Basing on the conformal mapping method and Hall’s tensor properties, a relation (a system of nonlinear equations) between the above mentioned quantities has been found.

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