Magnetic properties and magnetostructural phase transitions in Ni 2+xMn1-xGa shape memory alloys

V. V. Khovailo; V. Novosad; T. Takagi; D. A. Filippov; R. Z. Levitin; A. N. Vasil'ev

doi:10.1103/PhysRevB.70.174413

Magnetic properties and magnetostructural phase transitions in Ni _2+xMn_1-xGa shape memory alloys

V. V. Khovailo, V. Novosad, T. Takagi, D. A. Filippov, R. Z. Levitin, A. N. Vasil'ev

Center for Fundamental Research on Nuclear Decommissioning (CFReND)

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

70 Citations (Scopus)

Abstract

A systematic study of magnetic properties of Ni_2+xMn _1-xGa (0 ≤ x ≤ 0.19) Heusler alloys undergoing structural martensite-austenite transformations while in the ferromagnetic state has been performed. From measurements of spontaneous magnetization, M_s(T), jumps ΔM at structural phase transitions were determined. Virtual Curie temperatures of martensite were estimated from the comparison of magnetization in martensitic and austenitic phases. Both saturation magnetic moments in the ferromagnetic state and effective magnetic moments in paramagnetic state of Mn and Ni atoms were estimated and the influence of delocalization effects on magnetism in these alloys was discussed. The experimental results obtained show that the shift of martensitic transition temperature depends weakly on composition. The values of this shift are in good correspondence with the Clapeyron-Clausius formalism taking into account the experimental data on latent heat at martensite-austenite transformations.

Original language	English
Article number	174413
Pages (from-to)	1-6
Number of pages	6
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	70
Issue number	17
DOIs	https://doi.org/10.1103/PhysRevB.70.174413
Publication status	Published - 2004 Nov

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.70.174413

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title = "Magnetic properties and magnetostructural phase transitions in Ni 2+xMn1-xGa shape memory alloys",

abstract = "A systematic study of magnetic properties of Ni2+xMn 1-xGa (0 ≤ x ≤ 0.19) Heusler alloys undergoing structural martensite-austenite transformations while in the ferromagnetic state has been performed. From measurements of spontaneous magnetization, Ms(T), jumps ΔM at structural phase transitions were determined. Virtual Curie temperatures of martensite were estimated from the comparison of magnetization in martensitic and austenitic phases. Both saturation magnetic moments in the ferromagnetic state and effective magnetic moments in paramagnetic state of Mn and Ni atoms were estimated and the influence of delocalization effects on magnetism in these alloys was discussed. The experimental results obtained show that the shift of martensitic transition temperature depends weakly on composition. The values of this shift are in good correspondence with the Clapeyron-Clausius formalism taking into account the experimental data on latent heat at martensite-austenite transformations.",

author = "Khovailo, {V. V.} and V. Novosad and T. Takagi and Filippov, {D. A.} and Levitin, {R. Z.} and Vasil'ev, {A. N.}",

note = "Funding Information: This study was supported by RFBR Grants No. 02-02-16636 and No. 03-02-17443. Work at Argonne was supported by U.S. Department of Energy, BES Materials Sciences under Contract No. W-31-109-ENG-38. One of the authors (V.V.K.) gratefully acknowledges the Japan Society for the Promotion of Science for Financial support.",

year = "2004",

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doi = "10.1103/PhysRevB.70.174413",

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AU - Khovailo, V. V.

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AU - Takagi, T.

AU - Filippov, D. A.

AU - Levitin, R. Z.

AU - Vasil'ev, A. N.

N1 - Funding Information: This study was supported by RFBR Grants No. 02-02-16636 and No. 03-02-17443. Work at Argonne was supported by U.S. Department of Energy, BES Materials Sciences under Contract No. W-31-109-ENG-38. One of the authors (V.V.K.) gratefully acknowledges the Japan Society for the Promotion of Science for Financial support.

PY - 2004/11

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N2 - A systematic study of magnetic properties of Ni2+xMn 1-xGa (0 ≤ x ≤ 0.19) Heusler alloys undergoing structural martensite-austenite transformations while in the ferromagnetic state has been performed. From measurements of spontaneous magnetization, Ms(T), jumps ΔM at structural phase transitions were determined. Virtual Curie temperatures of martensite were estimated from the comparison of magnetization in martensitic and austenitic phases. Both saturation magnetic moments in the ferromagnetic state and effective magnetic moments in paramagnetic state of Mn and Ni atoms were estimated and the influence of delocalization effects on magnetism in these alloys was discussed. The experimental results obtained show that the shift of martensitic transition temperature depends weakly on composition. The values of this shift are in good correspondence with the Clapeyron-Clausius formalism taking into account the experimental data on latent heat at martensite-austenite transformations.

AB - A systematic study of magnetic properties of Ni2+xMn 1-xGa (0 ≤ x ≤ 0.19) Heusler alloys undergoing structural martensite-austenite transformations while in the ferromagnetic state has been performed. From measurements of spontaneous magnetization, Ms(T), jumps ΔM at structural phase transitions were determined. Virtual Curie temperatures of martensite were estimated from the comparison of magnetization in martensitic and austenitic phases. Both saturation magnetic moments in the ferromagnetic state and effective magnetic moments in paramagnetic state of Mn and Ni atoms were estimated and the influence of delocalization effects on magnetism in these alloys was discussed. The experimental results obtained show that the shift of martensitic transition temperature depends weakly on composition. The values of this shift are in good correspondence with the Clapeyron-Clausius formalism taking into account the experimental data on latent heat at martensite-austenite transformations.

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Magnetic properties and magnetostructural phase transitions in Ni _2+xMn_1-xGa shape memory alloys

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