Magnetic properties and large magnetic-field-induced strains in off-stoichiometric Ni–Mn–Al Heusler alloys

TLDR

Off‑stoichiometric Ni–Mn–Al Heusler alloys with an ordered L21 structure have been studied for their magnetic properties and magnetic‑field‑induced strains. In Ni53Mn25Al22, a martensitic transformation occurs below the Curie temperature, with irreversible MFIS observed between Ms and Mf; polycrystalline samples show a maximum ΔL/L of ~−100 ppm at 7 T just above Mf, while single crystals exhibit a large irreversible length change of ~1000 ppm at 7 T, and strain response to the magnetic field is delayed.

Abstract

Magnetic properties and magnetic-field-induced strains (MFIS) have been investigated for off-stoichiometric Ni–Mn–Al Heusler alloys with an ordered L21 structure. A clear martensitic transformation in Ni53Mn25Al22 alloy was revealed below the Curie temperature. In the polycrystalline specimen, an irreversible relative change due to the MFIS was confirmed between the martensite start and finish temperatures Ms and Mf, and a maximum relative length change ΔL/L|7T of about −100 ppm was observed at just above Mf. On the other hand, a large irreversible relative length change of about 1000 ppm has been demonstrated in the magnetic field of 7 T for a single crystal cut from the polycrystalline specimen. A delay of the response of strains against the magnetic field was also confirmed.