Magnetic entropy and magnetocaloric effect of ferromagnetic Heusler alloys Ni2Mn0.75Cu0.25Ga and Ni2MnGa 0.88Cu0.12

Takuo Sakon; Hitoshi Nagashio; Kenta Sasaki; Seiji Susuga; Keita Endo; Hiroyuki Nojiri; Takeshi Kanomata

doi:10.1016/j.jallcom.2012.04.077

Magnetic entropy and magnetocaloric effect of ferromagnetic Heusler alloys Ni₂Mn_0.75Cu_0.25Ga and Ni₂MnGa _0.88Cu_0.12

Takuo Sakon, Hitoshi Nagashio, Kenta Sasaki, Seiji Susuga, Keita Endo, Hiroyuki Nojiri, Takeshi Kanomata

IMR - Institute for Materials Research (institute affiliation only)

Research output: Contribution to journal › Article › peer-review

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Abstract

The magneto-structural transformation and the associated magnetic entropy change were studied in the ferromagnetic shape memory alloys Ni ₂Mn_0.75Cu_0.25Ga and Ni₂MnGa _0.88Cu_0.12 by using magnetization measurements performed around the martensite transformation temperature T_M and the Curie temperature T_C. The direct transition from the paramagnetic austenite phase (PM phase) to the ferromagnetic martensite phase (FM phase) was observed in both alloys. In a magnetic field of 2.0 T, the Ni₂Mn _0.75Cu_0.25Ga and Ni₂MnGa_0.88Cu _0.12 alloys showed large magnetic entropy changes of -ΔS _M = 15.2 J/kg K at 302 K and -7.5 J/kg K at 333 K, respectively. The magnetic entropy change of Ni₂Mn_0.75Cu_0.25Ga is larger than that of the polycrystalline Ni_2.19Mn_0.81Ga alloy. Theoretical calculations were also performed, and they agreed well with the experimental determinations of -ΔS_M.

Original language	English
Pages (from-to)	S376-S379
Journal	Journal of Alloys and Compounds
Volume	577
Issue number	SUPPL. 1
DOIs	https://doi.org/10.1016/j.jallcom.2012.04.077
Publication status	Published - 2013 Nov 15

Keywords

Heusler alloys
Magnetic entropy change
Magnetization
Magnetocaloric effect
Phase transition
Shape memory alloys

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10.1016/j.jallcom.2012.04.077

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@article{43b0e6c903c94d16b471610f2ce515f9,

title = "Magnetic entropy and magnetocaloric effect of ferromagnetic Heusler alloys Ni2Mn0.75Cu0.25Ga and Ni2MnGa 0.88Cu0.12",

abstract = "The magneto-structural transformation and the associated magnetic entropy change were studied in the ferromagnetic shape memory alloys Ni 2Mn0.75Cu0.25Ga and Ni2MnGa 0.88Cu0.12 by using magnetization measurements performed around the martensite transformation temperature TM and the Curie temperature TC. The direct transition from the paramagnetic austenite phase (PM phase) to the ferromagnetic martensite phase (FM phase) was observed in both alloys. In a magnetic field of 2.0 T, the Ni2Mn 0.75Cu0.25Ga and Ni2MnGa0.88Cu 0.12 alloys showed large magnetic entropy changes of -ΔS M = 15.2 J/kg K at 302 K and -7.5 J/kg K at 333 K, respectively. The magnetic entropy change of Ni2Mn0.75Cu0.25Ga is larger than that of the polycrystalline Ni2.19Mn0.81Ga alloy. Theoretical calculations were also performed, and they agreed well with the experimental determinations of -ΔSM.",

keywords = "Heusler alloys, Magnetic entropy change, Magnetization, Magnetocaloric effect, Phase transition, Shape memory alloys",

author = "Takuo Sakon and Hitoshi Nagashio and Kenta Sasaki and Seiji Susuga and Keita Endo and Hiroyuki Nojiri and Takeshi Kanomata",

note = "Funding Information: The authors thank Mr. D. Kikuchi for preparing the samples. This study was supported by a Grant-in-Aid from the Three-University Cooperation Project in the North-Tohoku area in Japan, and Japan Science and Technology Project, A-Step Project No. AS232Z02122B. Technical support for this project was provided by the Center for Integrated Nanotechnology Support at Tohoku University and by the High-Field Laboratory for Superconducting Materials at the Institute for Material Research at Tohoku University. One of the authors (H.N.) acknowledges support from GCOE-material integration.",

year = "2013",

month = nov,

day = "15",

doi = "10.1016/j.jallcom.2012.04.077",

language = "English",

volume = "577",

pages = "S376--S379",

journal = "Journal of Alloys and Compounds",

issn = "0925-8388",

publisher = "Elsevier BV",

number = "SUPPL. 1",

}

TY - JOUR

T1 - Magnetic entropy and magnetocaloric effect of ferromagnetic Heusler alloys Ni2Mn0.75Cu0.25Ga and Ni2MnGa 0.88Cu0.12

AU - Sakon, Takuo

AU - Nagashio, Hitoshi

AU - Sasaki, Kenta

AU - Susuga, Seiji

AU - Endo, Keita

AU - Nojiri, Hiroyuki

AU - Kanomata, Takeshi

N1 - Funding Information: The authors thank Mr. D. Kikuchi for preparing the samples. This study was supported by a Grant-in-Aid from the Three-University Cooperation Project in the North-Tohoku area in Japan, and Japan Science and Technology Project, A-Step Project No. AS232Z02122B. Technical support for this project was provided by the Center for Integrated Nanotechnology Support at Tohoku University and by the High-Field Laboratory for Superconducting Materials at the Institute for Material Research at Tohoku University. One of the authors (H.N.) acknowledges support from GCOE-material integration.

PY - 2013/11/15

Y1 - 2013/11/15

N2 - The magneto-structural transformation and the associated magnetic entropy change were studied in the ferromagnetic shape memory alloys Ni 2Mn0.75Cu0.25Ga and Ni2MnGa 0.88Cu0.12 by using magnetization measurements performed around the martensite transformation temperature TM and the Curie temperature TC. The direct transition from the paramagnetic austenite phase (PM phase) to the ferromagnetic martensite phase (FM phase) was observed in both alloys. In a magnetic field of 2.0 T, the Ni2Mn 0.75Cu0.25Ga and Ni2MnGa0.88Cu 0.12 alloys showed large magnetic entropy changes of -ΔS M = 15.2 J/kg K at 302 K and -7.5 J/kg K at 333 K, respectively. The magnetic entropy change of Ni2Mn0.75Cu0.25Ga is larger than that of the polycrystalline Ni2.19Mn0.81Ga alloy. Theoretical calculations were also performed, and they agreed well with the experimental determinations of -ΔSM.

AB - The magneto-structural transformation and the associated magnetic entropy change were studied in the ferromagnetic shape memory alloys Ni 2Mn0.75Cu0.25Ga and Ni2MnGa 0.88Cu0.12 by using magnetization measurements performed around the martensite transformation temperature TM and the Curie temperature TC. The direct transition from the paramagnetic austenite phase (PM phase) to the ferromagnetic martensite phase (FM phase) was observed in both alloys. In a magnetic field of 2.0 T, the Ni2Mn 0.75Cu0.25Ga and Ni2MnGa0.88Cu 0.12 alloys showed large magnetic entropy changes of -ΔS M = 15.2 J/kg K at 302 K and -7.5 J/kg K at 333 K, respectively. The magnetic entropy change of Ni2Mn0.75Cu0.25Ga is larger than that of the polycrystalline Ni2.19Mn0.81Ga alloy. Theoretical calculations were also performed, and they agreed well with the experimental determinations of -ΔSM.

KW - Heusler alloys

KW - Magnetic entropy change

KW - Magnetization

KW - Magnetocaloric effect

KW - Phase transition

KW - Shape memory alloys

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U2 - 10.1016/j.jallcom.2012.04.077

DO - 10.1016/j.jallcom.2012.04.077

M3 - Article

AN - SCOPUS:84891630741

SN - 0925-8388

VL - 577

SP - S376-S379

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

IS - SUPPL. 1

ER -

Magnetic entropy and magnetocaloric effect of ferromagnetic Heusler alloys Ni₂Mn_0.75Cu_0.25Ga and Ni₂MnGa _0.88Cu_0.12

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Keywords

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