Exchange bias behavior in Ni 50.0Mn 35.5 In 14.5 ribbons annealed at different temperatures

Abstract

Heusler alloy Ni 50.0Mn 35.5In 14.5 ribbons were prepared by melt-spinning technique. Several short time annealings were carried out in order to enhance the exchange bias effect in this alloy ribbon. The magnetic transition temperature increases with the annealing, compared to the as-spun sample, however no significant differences in respective Curie temperatures were observed for austenite and martensite phases in such annealed samples. Exchange bias effect is observed at low temperatures for all samples and practically vanishes at 60 K for the as-spun sample, whereas for the annealed ribbons it vanishes at 100 K

Authors are thankfultoSpanishMICINNforfinancialsupport:MAT2009-13108-C02-01-02andMAT2010-20798-C05-04