Abstract
In this study, the magnetic properties of Fe39.8Co19.92Mn20.52Cr14.77Si5 multi-principal element alloy in both bulk and thin films were studied. X-ray diffraction measurements show coexisting face centered cubic (FCC) and hexagonal close packed phases in the bulk and the 500 nm thin films, while only FCC phase is observed in the 65 nm thin film. A four orders of magnitude increase in the magnetic moment is observed for 65 nm thin film compared with the bulk sample. Evolution of magnetization as a function of temperature and applied magnetic field shows multiple magnetic transitions. A paramagnetic to spin glass transition is detected at TS ∼ 390 K for all samples. Further cooling results in a spin glass to ferromagnetic (FM) transition, and the transition temperature, TF, is dependent on the film thickness. Higher saturation magnetization and transition temperature observed for the thin film samples indicate the stabilization of FM ordering due to thickness confinement.
Highlights
In the last decade, multi-principal element alloys (MPEAs) have attracted a great deal of attention due to their novel properties such as excellent high temperature strength, exceptional ductility, high corrosion resistance, and good fracture toughness [1, 2, 3, 4, 5, 6, 7, 8]
The FeCoMnCrSi sputtering target and the bulk sample were cut from a rolled slab procured from Element Materials Technology
Bulk sample was cut in a cylindrical geometry with height of 1.11 mm and diameter of 3.16 mm
Summary
Multi-principal element alloys (MPEAs) have attracted a great deal of attention due to their novel properties such as excellent high temperature strength, exceptional ductility, high corrosion resistance, and good fracture toughness [1, 2, 3, 4, 5, 6, 7, 8]. The multiprincipal elemental composition in MPEA provides a unique way to access and manipulate novel material properties not observed in conventional alloys. While the structural and compositional aspects of MPEA have been widely explored, magnetic properties of these alloys are still in a nebulous phase. In the recent reviews on electrical and magnetic properties of MPEA [10, 11], alloys containing more than 50 at.% of the magnetic elements (Fe, Co, and Ni)
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