Abstract
Mn50Ni39+xSn11−x (x=0 and 2) Heusler alloys have been synthesized by arc melting technique. Structural, magnetic and exchange bias (EB) properties of these alloys have been investigated by changing the composition (x). For x=0, the large value of exchange bias field ∼536 Oe at 3 K has been observed, which is attributed to co-existence of AFM/FM exchange interaction present in the martensitic phase of these alloys. With decrease in Sn content, AFM/FM exchange interaction has been found to decrease due to change in Mn-Mn distance, which results a decrease in exchange bias properties. These results have also been strongly supported by double shifted magnetic hysteresis loop after zero field cooling. The EB properties can be tuned by not only changing the Sn content (x) but also by changing the field cooling strength.
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