Dependence of martensite transformation temperature on magnetic field in Ni2MnGa and Ni2MnGa0.95In0.05 single crystals

Cejpek, Petr; Proschek, Petr; Straka, Ladislav; Heczko, Oleg

doi:10.1016/j.jallcom.2022.164514

Cited by 2 publications

(1 citation statement)

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“…Since structural and magnetic transformations have been reported in Ni-Mn-Z (Z = Ga, Sn, In) alloys [1], many studies on austenitic and martensitic states have been investigated [2][3][4][5][6][7][8][9]. Upon cooling, these alloys undergo a first order martensitic transition from a high temperature cubic austenite phase (Ast), displaying long ferromagnetic (FM) order, to a low temperature modulated or non-modulated martensite phase (Mst) with complex magnetic behavior.…”

Section: Introductionmentioning

confidence: 99%

Microstructure, Critical Behavior and Magnetocaloric Properties of Melt-Spun Ni51.82Mn32.37In15.81

et al. 2022

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Heusler alloy with an atomic composition of Ni51.82Mn32.37In15.81 was prepared by melt spinning from arc-melted ingots. X−ray diffraction, scanning electron microscopy and magnetic measurements were used to study the structural, microstructural and magnetic properties. The crystal structure consists of a mixture of B2 austenite (~50%) and 14M martensite (~50%). The alloy undergoes a second order magnetic transition at a Curie temperature of TcA=194.2 K. The hysteresis loop reveals the occurrence of exchange bias phenomenon at room temperature. The critical exponents β, γ and δ were estimated using modified Arrott plots, Kouvel–Fisher curves and critical isothermal analysis. The respective values are β=0.500±0.015, γ=1.282±0.055 and δ=3.003±0.002. The critical behaviour in ribbons is governed by the mean field model with a dominated long-range order of ferromagnetic interactions. The maximum entropy change, ∆SMmax, for an applied magnetic field of 5 T reaches an absolute value of 0.92 J/kg.K. The experimental results of entropy changes are in good agreement with those calculated using Landau theory.

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