Magneto-caloric effects in Fe50Mn15Ni35

Magnetization measurements on the nearly invar alloy Fe50Mn15Ni35 sample have been carried out from liquid nitrogen temperature to room temperature in a magnetic field up to 8 kOe. Magnetic entropy changes (AS) have been calculated from magnetization measurements using Maxwell relations. The maximum...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2004-12, Vol.284, p.161-164
Main Authors: SAID, M. R, HAMAM, Y. A, ABU-ALJARAYESH, I
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Domain effects, magnetization curves, and hysteresis
Exact sciences and technology
Magnetic properties and materials
Magnetically ordered materials: other intrinsic properties
Magnetization curves, hysteresis, Barkhausen and related effects
Magnetization curves, magnetization reversal, hysteresis, barkhausen and related effects
Magnetocaloric effect, magnetic cooling
Physics
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Summary:Magnetization measurements on the nearly invar alloy Fe50Mn15Ni35 sample have been carried out from liquid nitrogen temperature to room temperature in a magnetic field up to 8 kOe. Magnetic entropy changes (AS) have been calculated from magnetization measurements using Maxwell relations. The maximum magnetic entropy change occurs at the Curie temperature (242 K) and it has a value of 6 J kg-1 K-1 under a magnetic field of 7 kOe. The considerable entropy change is believed to be due to high magnetization and the sharp change in magnetization at the Curie temperature (Tc).
ISSN:0304-8853
DOI:10.1016/j.jmmm.2004.06.033