Journal
PHILOSOPHICAL MAGAZINE
Volume 98, Issue 21, Pages 1919-1932Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/14786435.2018.1465240
Keywords
Heusler alloys; magnetocaloric effect; structural phase transition
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Funding
- Ankara University Research Funds [15L0443006]
- TUBITAK-2211 PhD scholarship programme
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The effect of heat treatment on the structural, magnetic and magnetocaloric properties of Ni43Mn46In11 melt-spun ribbons was systematically investigated using X-ray powder diffraction (XRD), scanning electron microscope (SEM), atomic force microscope (AFM), magnetic force microscope (MFM) and magnetic measurements. From the XRD studies, tetragonal and cubic phases were detected at room temperature for as-spun, quenched and slow-cooled ribbons. Furthermore, it was observed, upon annealing martensite transition temperatures increased when compared to the as-spun ribbon. To avoid magnetic hysteresis losses in the vicinity of the structural transition region, the magnetic entropy changes-S-m of the investigated ribbons were evaluated from temperature-dependent magnetisation-M(T) curves on cooling for different applied magnetic fields. The maximum S-m value was found to be 6.79J kg(-1)K(-1) for the quenched ribbon in the vicinity of structural transition region for a magnetic field change of 50kOe.
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