Crystalline Structure, Electrophysical and Magnetoresistive Properties of High Entropy Film Alloys

Abstract

The results of research the phase composition and electrophysical (resistivity, thermal coefficient of resistance, strain coefficient) and magnetoresistive properties (anisotropic magnetoresistance) of thin films (to 40 nm) high entropy alloys (HEA) based on Al, Cu, Ni, Cr, Fe, Co and Ti. It is established that after forming the layered samples by electron condensation on diffraction pattern fixed lines from the two phases of the fcc lattice and actually tracks the bcc phase. After homogenization by annealing the samples is one of the fcc phase s.s. HEA and traces bcc phase (likely s.s. (-Fe, Cr)), that samples are single phase. The study electrical properties allowed watching the first double-stage plastic deformation of a large value of the coefficient gauge (300 units), watch probably, is typical for НЕА. The character dependences MR from induction indicates to realization of anisotropic magnetoresistance.

Strain Properties of Multicomponent Nanosize Film Materials

“…Calculated data are presented in Figure 2. Note that, in the case of γ = 1.80 and μ f = 0.28, the calculated value γ l is compared with the experimental value from [10]:…”

“…In other words, such a film material can be considered as a single-layer film of a solid solution. This approach is fully justified if film s.s. are obtained by the method of simultaneous condensation of individual components (for more details, see [10]) or by the method of layer-by-layer condensation followed by annealing.…”

Manufactura y caracterización de aleaciones de alta entropía

“…Hasta ahora el sistema más estudiado es el reportado en la literatura como la aleación Cantor que es una aleación con composición CoCrFeMnNi [4]. Buscando optimizar la microestructura y las propiedades de este sistema, se ha añadido aluminio y otros elementos, obteniendo algunos resultados muy interesantes [5][6][7][8][9][10][11]. Sin embargo, los mecanismos de refuerzo aún no están claros.…”

Concentration Effects in the Electronic Properties of High-entropy Film Alloys

“…A fundamental generalization of the main results of these studies is carried out in [1]. Since 2010, intensive studies of the electrophysical, magnetic, and magnetoresistive properties of HEA, both bulk samples and coatings and thin films have begun (see, for example, [2][3][4][5][6][7][8]).…”

“…In our works [6][7][8], we described the observations of film HEA in the form of Co(20 nm)/Ni(14 nm)/ Cu(20 nm)/Fe(30 nm)/Al(15 nm)/S multilayer (S is the substrate) of the giant magnetoresistance with an amplitude of 0.30 %. We associated the realization of this effect with the spin-dependent scattering of conduction electrons on hypothetical AlNi particles [2].…”