Magnetic properties and magnetocaloric effect in Ni–Mn–Sn alloys

Magnetic and magnetocaloric properties in Ni50Mn50−xSnx alloys with wide range of the Sn-concentration (x=0–40) were investigated. The alloys were prepared by arc-melting and subsequently annealing at 850°C for 4h. The X-ray diffraction analyses manifest the formation of the crystalline phases (Ni2M...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2015-01, Vol.374, p.372-375
Main Authors: Dan, N.H., Duc, N.H., Yen, N.H., Thanh, P.T., Bau, L.V., An, N.M., Anh, D.T.K., Bang, N.A., Mai, N.T., Anh, P.K., Thanh, T.D., Phan, T.L., Yu, S.C.
Format: Article
Language:English
Subjects:
Alloys
Annealing
Crystal structure
Diffraction
Giant magnetocaloric effect
Heusler alloy
Magnetic properties
Magnetic refrigeration
Magnetic transition
Phases
Saturation (magnetic)
Tin
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Summary:Magnetic and magnetocaloric properties in Ni50Mn50−xSnx alloys with wide range of the Sn-concentration (x=0–40) were investigated. The alloys were prepared by arc-melting and subsequently annealing at 850°C for 4h. The X-ray diffraction analyses manifest the formation of the crystalline phases (Ni2MnSn, NiMn, Ni3Sn2, Mn3Sn, and MnSn2) in the alloys with various compositions and fabrication conditions. With increasing x, the saturation magnetization first increases from near zero (at x=10) to above 40emu/g (at x=20) and then decreases to below 10emu/g (at x=40) for both the as-melted and annealed cases. The martensitic–austenitic transition was observed in the alloys with a narrow range of x (13–15). The magnetic transitions in the alloy can be controlled by changing Sn-concentration. The alloy reveals both the positive and negative entropy changes with quite large magnitude (∆Sm>1J/kgK with ∆H=12kOe) with appropriate compositions and annealing conditions. •Crystalline phases and magnetic properties in Ni50Mn50−xSnx alloys (x=0–40).•Simultaneous transitions of structural and magnetic phases.•Coexistence of positive and negative giant magnetocaloric effect in Heusler alloys.•Tuning giant magnetocaloric effect in room temperature region.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2014.08.061