Tailoring of Magnetocaloric Effect in Ni45.5Mn43.0In11.5 Metamagnetic Shape Memory Alloy

Abstract

We investigate the direct and inverse magnetocaloric effect in Ni 45.5 Mn 43.0 In 11.5 Heusler alloy ribbons comparing the results obtained for the as-quenched sample with the ones after different annealing procedures. An enhancement and shift of the entropy maximum to near room temperature is observed in all annealed samples. A remarkable magnetocaloric effect is observed in samples with short-time treatment (10 minutes) and at the lowest annealing temperature. We show that the suppressing of uncompensated martensitic transition and thermal hysteresis are both influenced by the heat treatment. Also, an improvement on Curie's temperature is observed and, at low magnetic field, it has been risen up to 310 K. Our results demonstrate that the martensitic transformation is highly sensitive to the applied magnetic field and also to the annealing treatment, which means that the magnetocaloric effect can be tuned showing different behaviors for each sample.

Magnetic transformation in Ni-Mn-In Heusler alloy

“…1, we present the SEM morphology of two surfaces W and F of the Ni 50 Mn 35. 5 In 14.5 sample having a shape of ribbon. The surface W had a contact with wheel of equipment for ribbon fabrication.…”

“…4 In 15. 5 . Such a state results in splitting the resonance signal into two components, according to:…”

“…5 In 14.5 alloy was prepared by induction melting under argon atmosphere using pure elements of 99.9% purity. The melt-spun ribbon of this alloy was formed according to the procedure described in [10,11].…”

“…The ferromagnetic resonance technique (FMR) has been applied by us to study such magnetic correlations in a Ni 50 Mn 35. 5 In 14.5 ribbon. The same methodology was previously used for a Ni 49.1 Mn 35.…”