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D. I. Saltykov, Yu. O. Shkurdoda, and I. Yu. Protsenko
«Temperature Effects in Magnetoresistive Properties of Three-Layer Films Based on \(Fe_{80}Co_{20}\) Alloy and Copper»
0101–0109 (2019)

PACS numbers: 68.55.-a, 72.15.Gd, 73.50.Jt, 73.61.At, 73.63.Bd, 75.47.De, 75.47.Np

The influence of heat-treatment conditions on the magnetoresistive properties of three-layer films based on \(Fe_{80}Co_{20}\) alloy and Cu is investigated. As shown, for all as-deposited systems with a layer of copper with the thickness of 5Ц15 nm and ferromagnetic layers with \(d_F = 30Ц40\) nm, the field dependences are isotropic. In the case when the giant magnetoresistance is fixed, its amplitude has relatively large values in films annealed to 400 or 550 K. An increase of temperature to 700 K leads to an irreversible transition to anisotropic magnetoresistance. At the decreasing total thickness of as-deposited systems with ferromagnetic interlayers of 10Ц20 nm, the dependences become anisotropic. Annealing of them at a temperature of 550 K leads to a change in the nature of the magnetoresistance to isotropic one. In all investigated films with an isotropic character of magnetoresistance, both as-deposited and annealed ones at different temperatures, a decrease in the temperature of measurement down to 120 K stimulates an increase in magnitude of the magnetoresistance, which is due to the magnon and inelastic-phonon scatterings of electrons.

Keywords: three-layer films, thermal treatment, GMR effect, spin-dependent electron scattering, magnetoresistance

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