Spin-dependent scattering of conduction electrons in diluted magnetic semiconductors:Hg1−xFexSe

1985 ◽  
Vol 32 (6) ◽  
pp. 3921-3929 ◽  
Author(s):  
M. Vaziri ◽  
R. Reifenberger
Keyword(s):  
Conduction Electrons ◽  
Spin Dependent Scattering ◽  
Diluted Magnetic

A QUANTUM MODEL FOR THE GIANT MAGNETORESISTANCE EFFECT

1996 ◽  
Vol 10 (17) ◽  
pp. 2103-2110
Author(s):  
LEI ZHOU ◽  
RUIBAO TAO
Keyword(s):  
Simple Model ◽  
Electric Conductivity ◽  
Giant Magnetoresistance ◽  
Quantum Model ◽  
Magnetoresistance Effect ◽  
Conduction Electrons ◽  
Giant Magnetoresistance Effect ◽  
Model Hamiltonian ◽  
Spin Dependent Scattering ◽  
Scattering Potential

A quantum explanation based on the previous semi-classical theory has been presented for the giant magnetoresistance (GMR) effect in this letter. A simple model Hamiltonian has been proposed for the conduction electrons in the magnetic layered structures in which the interaction of the conduction electrons with the local spins and the spin-dependent scattering potential have been considered, then an analytical expression of the effective electric conductivity is derived after some simplifying procedures. The main feature of the GMR effect may be explained by this simple model qualitatively.

Spin-dependent scattering of conduction electrons in Co/Cu multilayers

2015 ◽  
Vol 389 ◽  
pp. 169-175 ◽  
Author(s):  
I.D. Lobov ◽  
M.M. Kirillova ◽  
A.A. Makhnev ◽  
M.A. Milyaev ◽  
L.N. Romashev ◽  
...  
Keyword(s):  
Conduction Electrons ◽  
Spin Dependent Scattering

Spin-dependent scattering of conduction electrons in Cd3-x-yZnxMnyAs2alloys

1991 ◽  
Vol 6 (7) ◽  
pp. 619-625 ◽  
Author(s):  
W Lubczynski ◽  
J Cisowski ◽  
J Kossut ◽  
J C Portal
Keyword(s):  
Conduction Electrons ◽  
Spin Dependent Scattering

Effective Way to Improve the Magnetoresistance Effect in Perovskite at Room Temperature

2011 ◽  
Vol 704-705 ◽  
pp. 954-959
Author(s):  
Bao Xin Huang ◽  
Jian Li ◽  
Jun Hua Wang ◽  
Ke Zheng Chen ◽  
Yi Hua Liu ◽  
...  
Keyword(s):  
Room Temperature ◽  
Composite System ◽  
Small Polaron ◽  
Application Research ◽  
Polaron Hopping ◽  
Conduction Electrons ◽  
Effective Selection ◽  
Spin Dependent Scattering ◽  
Mr Effect ◽  
Hopping Model

The magnetic and electrical properties of the La0.67Ca0.25Sr0.08MnO3/xAg composite system are systematically investigated as a function of Ag-added content. With increasing the Ag dopant amount, the magnetization decreases a little while Curie temperature (TC) is almost independent of Ag content around 312 K. The resistivity reduces rapidly with Ag addition ( x < 0.25 ) due to the decomposed metal Ag, and then it increases slightly which is probably induced by the less Ag content related to the volatilization of Ag during calcinations. At low temperature, the ρ – T curves fit well by the expression of ρ =ρ0 +ρ2T2 +ρ4.5T4.5 while all data for the above TC can be fitted by using the adiabatic small-polaron-hopping model ρ=ρ0T exp (E/kBT ). The enhancement of MR effect ( 41% ) at room temperature is mainly related to the coexistence of intrinsic MR properties and the spin dependent scattering of conduction electrons at the interfaces. These results indicate that combining the doping effect with the composite method is an effective selection in enhancement of MR at room temperature, which is very meaningful for the application research.

Unified Semi-Classical Theory of Parallel and Perpendicular Giant Magnetoresistance in Superlattices

1995 ◽  
Vol 384 ◽  
Author(s):  
V.V. Ustinov ◽  
E.A. Kravtsov
Keyword(s):  
Boundary Conditions ◽  
Classical Theory ◽  
Giant Magnetoresistance ◽  
Distribution Functions ◽  
Classical Approach ◽  
Conduction Electrons ◽  
Boltzman Equation ◽  
Magnetic Superlattices ◽  
Exact Boundary ◽  
Spin Dependent Scattering

ABSTRACTThe giant magnetoresistance in magnetic superlattices for the current perpendicular to and in the layer planes is studied within a unified semi-classical approach that is based on the Boltzman equation with exact boundary conditions for the spin-dependent distribution functions of conduction electrons. We show that the main differences between the in-plane and perpendicular-to-plane magnetoresistance result from the fact that they originate from different interface processes responsible for spin-dependent scattering. A correlation between the giant magnetoresistance and the superlattice magnetization is also discussed and it is shown that its study has much potential for yielding information about properties of spin-dependent scattering in magnetic superlattices.

Spin polarization in magnets

2017 ◽  
Author(s):  
K. Takanashi ◽  
Y. Sakuraba
Keyword(s):  
Spin Polarization ◽  
Spin Current ◽  
Spin Transfer Torque ◽  
Spin Transfer ◽  
Energy Band Gap ◽  
Magnetoresistance Effect ◽  
Half Metals ◽  
Conduction Electrons ◽  
Spin Polarized ◽  
Spin Dependent Scattering

This chapter explains how the exchange splitting between up- and down-spin bands in ferromagnets unexceptionally generates spin-polarized electronic states at the Fermi energy. The quantity of spin polarization P in ferromagnets is one of the important parameters for application in spintronics, since a ferromagnet having a higher P is able to generate larger various spin-dependent effects such as the magnetoresistance effect, spin transfer torque, spin accumulation, and so on. However, the spin polarizations of general 3d transition metals or alloys generally limit the size of spin-dependent effects. Thus,“‘half-metals” attract much interest as an ideal source of spin current and spin-dependent scattering because they possess perfectly spin-polarized conduction electrons due to the energy band gap in either the up- or down-spin channel at the Fermi level.

Thermo-electricity at low temperatures. IX. The transition metals as solute and solvent

1962 ◽  
Vol 266 (1325) ◽  
pp. 161-184 ◽  
Keyword(s):  
Experimental Data ◽  
Transition Metals ◽  
Low Temperatures ◽  
Transition Element ◽  
Present Theory ◽  
Parent Metal ◽  
Transition Elements ◽  
Thermo Electric ◽  
Conduction Electrons ◽  
Spin Dependent Scattering

Transition metals (in particular Cr, Mn, Fe, Co and Ni) present as solutes give rise to highly anomalous thermo-electric powers and unusual resistive behaviour at very low temperatures. Following an outline of the theories which have been proposed to account for this behaviour, experimental data are presented on alloys of gold as parent metal with transition element solutes down to very low temperatures, and the results compared broadly with the conclusions of present theory. It is generally believed that the fundamental origin of the anomalous thermo-electric behaviour lies in the spin-dependent scattering of conduction electrons by the magnetic solute ions. Experimental data are also presented of the thermo-electric behaviour down to very low temperatures of alloys of the transition metals Pd and Pt with both transition elements and non-transition elements as solutes.

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