Abstract
The crystal structure, phase transition and exchange bias effect in induction melted polycrystalline ribbons of Ni55Mn19Al24Si2 have been studied using room temperature x-ray diffraction (XRD), differential scanning calorimetry (DSC) and magnetic measurements. The sample was found to show structural transformation temperatures such as austenite start (As)=306K, austenite finish (Af)=316K, martensite start (Ms)=305K and martensite finish (Mf)=294K all above room temperature. The room temperature structure evaluated as orthorhombic 14M with lattice parameters a=4.14Å, b=29.84Å, and c=5.72Å. Importantly at ~2K, the sample showed a large exchange bias field of about 2520Oe, which is the maximum value ever reported among the Heusler alloy samples.
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