Giant Magnetic Field Effect on Thermal Conductivity of Magnetic Multilayers, Cu/Co/Cu/Ni(Fe)

AbstractWe report on near-turbulent thermal convection of a nematic liquid crystal heated from below in a cylindrical cell with an aspect ratio (diameter/height) equal to 0.50 for Rayleigh numbers $2\times 1{0}^{7} \lesssim \mathit{Ra}\lesssim 3\times 1{0}^{8} $ and a Prandtl number of about 355. The Nusselt number $\mathit{Nu}$ as a function of $\mathit{Ra}$ did not differ significantly from that of an isotropic fluid. In a vertical magnetic field $\mathbi{H}$, we found $\mathit{Nu}(H)/ \mathit{Nu}(0)= 1+ a(\mathit{Ra}){H}^{2} $, with $a(\mathit{Ra})= 0. 24{\mathit{Ra}}^{0. 75} ~{\mathrm{G} }^{- 2} $. We present a model that describes the $H$ dependence in terms of a change of the thermal conductivity in the thermal boundary layers due to a field-induced director alignment.

Download Full-text

Magnetic-field effect on the phonon echoes in a rare-earth-doped glass

Journal de Physique ◽

10.1051/jphys:019870048080125100 ◽

1987 ◽

Vol 48 (8) ◽

pp. 1251-1254 ◽

Cited By ~ 3

Author(s):

F. Lerbet ◽

G. Bellessa

Keyword(s):

Magnetic Field ◽

Rare Earth ◽

Field Effect ◽

Magnetic Field Effect ◽

Doped Glass ◽

Rare Earth Doped ◽

Rare Earth Doped Glass

Download Full-text

External Magnetic Field Effect on the Reaction of H2with O2on Metal Oxide Surfaces*

Zeitschrift für Physikalische Chemie ◽

10.1524/zpch.1992.1.part_2.309 ◽

1992 ◽

Vol 1 (Part_2) ◽

pp. 309-319

Author(s):

Hisao Ohnishi ◽

Hirokazu Sasaki ◽

Msamichi Ippommatsu

Keyword(s):

Magnetic Field ◽

External Magnetic Field ◽

Metal Oxide ◽

Field Effect ◽

Magnetic Field Effect ◽

Oxide Surfaces ◽

Metal Oxide Surfaces

Download Full-text

The Model for Calculation the Hall Effect Parameter

Nonlinear Analysis Modelling and Control ◽

10.15388/na.2004.9.2.15161 ◽

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.

Download Full-text