Crystalline Structure and Physical Properties of High-Entropy Film Alloys

Authors Yu.S. Bereznyak1, M. Opielak2, L.V. Odnodvorets1 , D.V. Poduremne1 , I.Yu. Protsenko1 , Yu.M. Shabelnyk1

1Sumy State University, 2, Rymskyi-Korsakov Str., 40007 Sumy, Ukraine

2Lublin University of Technology, 38A, Nadbystrzycka Str., 20-618 Lublin, Poland

Issue Volume 11, Year 2019, Number 2
Dates Received 12 November 2018; revised manuscript received 04 April 2019; published online 15 April 2019
Citation Yu.S. Bereznyak, M. Opielak, L.V. Odnodvorets, и др., J. Nano- Electron. Phys. 11 No 2, 02026 (2019)
PACS Number(s) 61.66.Хх, 62.20.F –, 75.47.Np
Keywords High-entropy alloy, Elemental composition (2) , Resistivity (11) , Temperature coefficient of resistance, Magnetoresistance (6) , Magnetization (18) .

The results of the study of phase composition, electrophysical (resistivity, thermal coefficient of resistance), magnetoresistivity (giant magnetoresistance) and magnetic (magnetization) properties of thin films (up to 100 nm) of high-entropy alloys based on Al, Cu, Ni, Fe and Co are presented. It was established that after the formation of samples by layered deposition on diffraction pattern, lines from two phases with a fcc lattice and traces of the bcc phase are fixed. After homogenization by thermal annealing of the samples, there remains one fcc phase s.s. HEA (а = 0.360-0.365 nm) and traces of the bcc phase (most likely s.s. α-Fe(Cr)), that is, in fact, single-phase. It was received that the dependence of the magnetoresistance versus induction has all the features of the GMR with amplitude 0.15-0.20 %. Resistivity and thermal coefficient of resistance have relatively large values  ρ ∼ 10 – 7 Ohm.m and β ∼ 10 – 3 К – 1. Within the size effect models in the temperature coefficient of resistance, the mean free path of electrons (λ =  73-85 nm) is calculated. The field and temperature dependences of the magnetization at the magnetic field induction B = 0-5 T (T = 2 and 300 K) at the conditions field of cooling (FC) and cooling without a magnetic field (ZFC) in the temperatures range from 2 to 400 K are presented.

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