Magnetic and transport properties of Ni–Mn–In Heusler alloy films: the effect of structural disorder

Y. V. Kudryavtsev (), A. K. Melnik, I. Gościańska, J. Dubowik and A. F. Kravets
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Y. V. Kudryavtsev: N.A.S. of Ukraine
A. K. Melnik: N.A.S. of Ukraine
I. Gościańska: A. Mickewicz University
J. Dubowik: PAS
A. F. Kravets: N.A.S. and M.E.S. of Ukraine

The European Physical Journal B: Condensed Matter and Complex Systems, 2021, vol. 94, issue 4, 1-7

Abstract: Abstract We report the structural disorder effect on magnetic and electric transport properties of $$\hbox {Ni}_{50}\hbox {Mn}_{35}\hbox {In}_{15}$$ Ni 50 Mn 35 In 15 Heusler alloy (HA) films. Two sets of samples were investigated: disordered (partially amorphous) and ordered (crystalline with $$\hbox {L2}_{1}$$ L2 1 structure) samples. Electric transport measurements vs. temperature shows that the process of structural ordering is accomplished with a two-stage drop in resistivity at 570 and 630 K which are ascribed to crystallization and $$\hbox {L2}_{1}$$ L2 1 -type structural ordering, respectively. Ordered films show a metallic and magnetization behavior typical for $$\hbox {Ni}_{50}\hbox {Mn}_{35}\hbox {In}_{15}$$ Ni 50 Mn 35 In 15 HA. By contrast, disordered films show ten times lower saturation magnetization with comparable effective magnetization determined from ferromagnetic resonance. We explain this difference as the unusual effect of the inhomogeneous microstructure of the disordered films consisting of Ni clusters embedded in a nonmagnetic matrix. Graphic abstract

Date: 2021
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DOI: 10.1140/epjb/s10051-021-00103-0

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