Magnetocaloric effect in amorphous and partially crystallized Fe40Ni38Mo4B18 alloys | Zendy

T. Thanveer | Zendy; R.V. Ramanujan | Zendy; Senoy Thomas | Zendy

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Magnetocaloric effect in amorphous and partially crystallized Fe40Ni38Mo4B18 alloys

Author(s) -

T. Thanveer,

R.V. Ramanujan,

Senoy Thomas

Publication year - 2016

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.4952969

Subject(s) - magnetic refrigeration , amorphous solid , materials science , annealing (glass) , crystallization , amorphous metal , condensed matter physics , magnetic field , thermodynamics , metallurgy , magnetization , crystallography , chemistry , physics , quantum mechanics

A study of magnetocaloric effect in amorphous and partially crystallized Fe40Ni38Mo4B18 alloys is reported. Amorphous Fe40Ni38Mo4B18, near its magnetic ordering temperature (600K) showed a magnetic entropy change ΔSM of 1.1 J/KgK and a relative cooling power of 36J/Kg in a field change of 10 kOe. Amorphous samples were partially crystallized by annealing at 700 K at different time intervals. Partially crystallized samples showed two distinct magnetic ordering temperature, one corresponding to the precipitated FeNi nanocrystals and the other one corresponding to the boron rich amorphous matrix. Magnetic ordering temperature of the residual amorphous matrix got shifted to the lower temperatures on increasing the annealing duration. Partially crystallised samples showed a magnetic entropy change of about 0.27J/kgK near the magnetic ordering temperature of the amorphous matrix (540K) in a field change of 10 kOe. The decrease in ΔSM on partial crystallisation is attributed to the biphasic magnetic nature of the sample

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