Magnetic entropy change involving martensitic transition in NiMn-based Heusler alloys

doi:10.1088/1674-1056/22/3/037505

摘要/Abstract

摘要： Our recent progress on magnetic entropy change (ΔS) involving martensitic transition in both conventional and metamagnetic NiMn-based Heusler alloys is reviewed. For the conventional alloys, where both martensite and austenite exhibit ferromagnetic (FM) behavior but show differentmagnetic anisotropies, a positive ΔS as large as 4.1 J·kg^-1·K^-1 under a field change of 0–0.9 T was first observed at martensitic transition temperature T_M ~ 197 K. Through adjusting the Ni:Mn:Ga ratio to affect valence electron concentration e/a, T_M was successfully tuned to room temperature, and a large negative ΔS was observed in a single crystal. The -ΔS attained 18.0 J·kg-1·K-1 under a field change of 0–5 T. We also focused on the metamagnetic alloys that show mechanisms different from the conventional ones. It was found that post-annealing in suitable conditions or introducing interstitial H atoms can shift the T_M across a wide temperature range while retaining the strong metamagnetic behavior, and hence, retaining large magnetocaloric effect (MCE) and magnetoresistance (MR). The melt-spun technique can disorder atoms and make the ribbons display a B2 structure, but the metamagnetic behavior, as well as the MCE, becomes weak due to the enhanced saturated magnetization of martensites. We also studied the effect of Fe/Co co-doping in Ni₄₅(Co_1-xFe_x)5Mn36.6In13.4 metamagnetic alloys. Introduction of Fe atoms can assist the conversion of the Mn–Mn coupling from antiferromagnetic to ferromagnetic, thus maintaining the strong metamagnetic behavior and large MCE and MR. Furthermore, a small thermal hysteresis but significant magnetic hysteresis was observed around T_M in Ni₅₁Mn_49-xIn_x metamagnetic systems, which must be related to different nucleation mechanisms of structural transition under different external perturbations.

关键词: magnetic entropy change, martensitic transition, NiMn-based Heusler alloys

Abstract: Our recent progress on magnetic entropy change (ΔS) involving martensitic transition in both conventional and metamagnetic NiMn-based Heusler alloys is reviewed. For the conventional alloys, where both martensite and austenite exhibit ferromagnetic (FM) behavior but show differentmagnetic anisotropies, a positive ΔS as large as 4.1 J·kg^-1·K^-1 under a field change of 0–0.9 T was first observed at martensitic transition temperature T_M ~ 197 K. Through adjusting the Ni:Mn:Ga ratio to affect valence electron concentration e/a, T_M was successfully tuned to room temperature, and a large negative ΔS was observed in a single crystal. The -ΔS attained 18.0 J·kg^-1·K^-1 under a field change of 0–5 T. We also focused on the metamagnetic alloys that show mechanisms different from the conventional ones. It was found that post-annealing in suitable conditions or introducing interstitial H atoms can shift the T_M across a wide temperature range while retaining the strong metamagnetic behavior, and hence, retaining large magnetocaloric effect (MCE) and magnetoresistance (MR). The melt-spun technique can disorder atoms and make the ribbons display a B2 structure, but the metamagnetic behavior, as well as the MCE, becomes weak due to the enhanced saturated magnetization of martensites. We also studied the effect of Fe/Co co-doping in Ni₄₅(Co_1-xFe_x)5Mn36.6In13.4 metamagnetic alloys. Introduction of Fe atoms can assist the conversion of the Mn–Mn coupling from antiferromagnetic to ferromagnetic, thus maintaining the strong metamagnetic behavior and large MCE and MR. Furthermore, a small thermal hysteresis but significant magnetic hysteresis was observed around T_M in Ni₅₁Mn_49-xIn_x metamagnetic systems, which must be related to different nucleation mechanisms of structural transition under different external perturbations.

Key words: magnetic entropy change, martensitic transition, NiMn-based Heusler alloys

中图分类号: (Magnetocaloric effect, magnetic cooling)

75.30.Sg

75.50.Bb (Fe and its alloys)

胡凤霞, 沈保根, 孙继荣. Magnetic entropy change involving martensitic transition in NiMn-based Heusler alloys[J]. 中国物理B, 2013, 22(3): 37505-037505.

Hu Feng-Xia(胡凤霞), Shen Bao-Gen (沈保根), Sun Ji-Rong(孙继荣). Magnetic entropy change involving martensitic transition in NiMn-based Heusler alloys[J]. Chin. Phys. B, 2013, 22(3): 37505-037505.

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