Title :
Metastability in the Magnetic Structure of Ni51Mn33.4In15.6 Heusler Alloy
Author :
Seyoum, Hailemichael M. ; Ghahremani, Mohammadreza ; ElBidweihy, Hatem ; Bennett, Lawrence H. ; Della Torre, Edward ; Johnson, Francis ; Min Zuo
Author_Institution :
Univ. of the District of Columbia, Washington, DC, USA
Abstract :
The metastability of the nonstoichiometric Ni51Mn33.4In15.6 Heusler alloy in the first-order transition region is studied using direct adiabatic temperature change (ΔTad) measurements for heating and cooling magnetization processes. During the heating process, ΔTad shows an unusual pronounced peak at 294 K in low applied magnetic fields. The height of this peak diminishes and eventually vanishes at higher fields. Kinks are as well observed in the 290-295 K temperature interval for both processes. The existence of the peak and kinks is indicative of the complex magnetic dynamics in Ni51Mn33.4In15.6 and is attributed to a spin-reorientation transition near the first-order phase transition temperature.
Keywords :
cooling; heat treatment; indium alloys; magnetic structure; magnetic transitions; magnetisation; manganese alloys; martensitic transformations; nickel alloys; spin dynamics; stoichiometry; Ni51Mn33.4In15.6; complex magnetic dynamics; cooling; direct adiabatic temperature change measurement; first-order phase transition; heating; kinks; low applied magnetic fields; magnetic structure; magnetization; martensitic transition; metastability; nonstoichiometric Heusler alloy; spin reorientation transition; structural transformation; temperature 290 K to 295 K; Magnetocaloric effects; Coupled phenomena; Ni-Mn-In Heusler alloy; magnetocaloric effect;
Journal_Title :
Magnetics Letters, IEEE
DOI :
10.1109/LMAG.2013.2267724
