Structural, magnetic, magnetocaloric and magnetotransport properties in Ge doped Ni–Mn–Sb Heusler alloys

The effect of Ge substitution on the magnetic, magnetocaloric and transport properties of Ni45Co5Mn38Sb12−xGex (x=0–3) has been investigated. The decrease in the exchange interaction brought by Ge substitution can be seen from the reduction in the magnetization of austenite phase and the increase in...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2012-04, Vol.324 (7), p.1267-1271
Main Authors: Sahoo, Roshnee, Nayak, Ajaya K., Suresh, K.G., Nigam, A.K.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Conductivity phenomena in semiconductors and insulators
Cross-disciplinary physics: materials science
rheology
Electronic transport in condensed matter
Exact sciences and technology
Exchange and superexchange interactions
Full Heusler alloy
Galvanomagnetic and other magnetotransport effects
Germanium
Heusler alloys
Magnetic properties
Magnetic properties and materials
Magnetically ordered materials: other intrinsic properties
Magnetization
Magnetocaloric effect
Magnetocaloric effect, magnetic cooling
Magnetoresistance
Magnetoresistivity
Martensitic transformations
Materials science
Nickel base alloys
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Physics
Transition temperature
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Summary:The effect of Ge substitution on the magnetic, magnetocaloric and transport properties of Ni45Co5Mn38Sb12−xGex (x=0–3) has been investigated. The decrease in the exchange interaction brought by Ge substitution can be seen from the reduction in the magnetization of austenite phase and the increase in the martensitic transition temperature. The magnetocaloric effect and the magnetoresistance values are found to be quite sensitive to small changes in Sb/Ge ratio. Taking into account various properties, the present series seems to be a promising multifunctional system. ► The martensitic transition can be tuned to room temperature with a small change in Sb/Ge ratio. ► Substitution of Ge in Sb site in Ni45Co5Mn38Sb12 system leads to decrease in exchange interaction. ► Magnetization in austenite phase gradually decreases with increase in Ge concentration. ► The Hysteresis observed near martensitic transition for x=0 decreases considerably for x=3 in Ni45Co5Mn38Sb12−xGex system.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2011.11.025