Abstract
A Monte Carlo simulation of magnetic properties for structures Fe/Cr/Fe and Co/Cu/Co, constructed from two ferromagnetic films divided by nonmagnetic film are carried out. The calculation of the magnetoresistance is carried out in case of CPP and CIP geometry for different thicknesses of the ferromagnetic films with the use of the anisotropic Heisenberg model for determination of magnetic properties. It was shown, that the obtained temperature dependence for the magnetoresistance agrees very well with experimental results.
Highlights
The artificial created multilayer magnetic superlattices has become of great interest for wide range of applications based on the phenomena of the giant magnetoresistance (GMR) and the tunneling magnetoresistance
The multilayer structure can connect two ways in the current line for measurements of the resistance: first case with the current in plane (CIP), when the current conduction is realized along layers and the electrodes are situated on one side of the structure, and second case with the current perpendicular to plane (CPP), when the current conduction is realized perpendicular to the layers of the superstructure and the electrodes are situated on both sides of the structure
The procedure of calculation consists of the following steps: the first step is connected with Monte Carlo simulations of a magnetic structure in the equilibrium state at temperature T with determination of the magnetization of ferromagnetic films m1 and m2, which gives the possibility of calculating the electron densities n↑,↓ for film cells; in the second step the average electron velocities V↑,↓ and the current densities J↑,↓ are calculated under relations (5)–(7) subject to the spin configuration realized at a given time of the simulation and averaged over Monte
Summary
The artificial created multilayer magnetic superlattices has become of great interest for wide range of applications based on the phenomena of the giant magnetoresistance (GMR) and the tunneling magnetoresistance. We developed in [4, 5] a new methodology for determination of the magnetoresistance (MR) with the use of the Monte Carlo method for measurements of MR with the current perpendicular to plane (CPP – MR). The magnetoresistance had been calculated for three-layer and spin-valve magnetic structures at various thicknesses of ferromagnetic films. It had been shown that the calculated temperature dependence of the magnetoresistance is in good agreement with experimental data obtained for the Fe(001)/Cr(001) multilayer structure and the CFAS/Ag/CFAS/IrMn spin valve based on the Co2FeAl0.5Si0.5 (CFAS) Heusler alloy. We expand our methodology [4] for determination of MR in case of measurements with the current in plane (CIP–MR). The parameter of scattering can be determined from comparison of calculated and experimentally measured CIP-MR values
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