Large inverse magnetic entropy changes and magnetoresistance in the vicinity of a field-induced martensitic transformation in Ni50-x Cox Mn32-y Fey Ga18

Arjun K. Pathak; Igor Dubenko; Haluk E. Karaca; Shane Stadler; Naushad Ali

doi:10.1063/1.3467460

Large inverse magnetic entropy changes and magnetoresistance in the vicinity of a field-induced martensitic transformation in Ni_50-x Co_x Mn_32-y Fe_y Ga₁₈

Arjun K. Pathak, Igor Dubenko, Haluk E. Karaca, Shane Stadler, Naushad Ali

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

51 Scopus citations

Abstract

Significantly large inverse magnetic entropy changes (Δ S _M) and magnetoresistance (MR) were observed at the inverse martensitic phase transitions of the Ga-based magnetic shape memory Heusler alloys: Ni_50-x Co_x Mn_32-y Fe_y Ga₁₈. The crystal structures of alloys were tetragonal at 300 K and the phase transition temperatures and magnetic properties were found to be correlated with the degree of tetragonal distortion. The maximum peak values of the Δ S_M and MR at H=5 T were determined as ≈ (+) 31 J Kg^-1 K^-1 and ≈-21%, respectively, for x=8 and y=2. The relatively small hysteretic loss and large refrigeration capacity observed in this system make these compounds promising materials for applications.

Original language	English
Article number	062505
Journal	Applied Physics Letters
Volume	97
Issue number	6
DOIs	https://doi.org/10.1063/1.3467460
State	Published - Aug 9 2010

Bibliographical note

Funding Information:
This research was supported by Research Corporation (RA-0357) and by the Office of Basic Energy Sciences, U.S. DOE (Contract No. DE-FG02-06ER46291).

Funding

This research was supported by Research Corporation (RA-0357) and by the Office of Basic Energy Sciences, U.S. DOE (Contract No. DE-FG02-06ER46291).

Funders	Funder number
Michigan State University-U.S. Department of Energy (MSU-DOE) Plant Research Laboratory	DE-FG02-06ER46291
Research Corporation for Science Advancement	RA-0357
Office of Basic Energy Sciences

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

Access to Document

10.1063/1.3467460

Cite this

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title = "Large inverse magnetic entropy changes and magnetoresistance in the vicinity of a field-induced martensitic transformation in Ni50-x Cox Mn32-y Fey Ga18",

abstract = "Significantly large inverse magnetic entropy changes (Δ S M) and magnetoresistance (MR) were observed at the inverse martensitic phase transitions of the Ga-based magnetic shape memory Heusler alloys: Ni50-x Cox Mn32-y Fey Ga18. The crystal structures of alloys were tetragonal at 300 K and the phase transition temperatures and magnetic properties were found to be correlated with the degree of tetragonal distortion. The maximum peak values of the Δ SM and MR at H=5 T were determined as ≈ (+) 31 J Kg-1 K-1 and ≈-21\%, respectively, for x=8 and y=2. The relatively small hysteretic loss and large refrigeration capacity observed in this system make these compounds promising materials for applications.",

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T1 - Large inverse magnetic entropy changes and magnetoresistance in the vicinity of a field-induced martensitic transformation in Ni50-x Cox Mn32-y Fey Ga18

AU - Pathak, Arjun K.

AU - Dubenko, Igor

AU - Karaca, Haluk E.

AU - Stadler, Shane

AU - Ali, Naushad

N1 - Funding Information: This research was supported by Research Corporation (RA-0357) and by the Office of Basic Energy Sciences, U.S. DOE (Contract No. DE-FG02-06ER46291).

PY - 2010/8/9

Y1 - 2010/8/9

N2 - Significantly large inverse magnetic entropy changes (Δ S M) and magnetoresistance (MR) were observed at the inverse martensitic phase transitions of the Ga-based magnetic shape memory Heusler alloys: Ni50-x Cox Mn32-y Fey Ga18. The crystal structures of alloys were tetragonal at 300 K and the phase transition temperatures and magnetic properties were found to be correlated with the degree of tetragonal distortion. The maximum peak values of the Δ SM and MR at H=5 T were determined as ≈ (+) 31 J Kg-1 K-1 and ≈-21%, respectively, for x=8 and y=2. The relatively small hysteretic loss and large refrigeration capacity observed in this system make these compounds promising materials for applications.

AB - Significantly large inverse magnetic entropy changes (Δ S M) and magnetoresistance (MR) were observed at the inverse martensitic phase transitions of the Ga-based magnetic shape memory Heusler alloys: Ni50-x Cox Mn32-y Fey Ga18. The crystal structures of alloys were tetragonal at 300 K and the phase transition temperatures and magnetic properties were found to be correlated with the degree of tetragonal distortion. The maximum peak values of the Δ SM and MR at H=5 T were determined as ≈ (+) 31 J Kg-1 K-1 and ≈-21%, respectively, for x=8 and y=2. The relatively small hysteretic loss and large refrigeration capacity observed in this system make these compounds promising materials for applications.

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