Abstract
AbstractThe rate-independent stabilization of magnetic states with iterations in a Heusler alloy has been studied. The direct measurement of the adiabatic temperature change, ΔTad, of a Ni51Mn33.4In15.6 alloy near the magnetostructural phase transition is presented. The adiabatic temperature change at a given temperature within the temperature range of the magnetostructural transition is history dependent and varies considerably with the iteration count of the field cycle. The data show the transition from the low magnetization state to the high magnetization state during low to high (L–H) temperature change direction and from high magnetization to low magnetization state during high to low (H–L) temperature change direction require several field cycles to stabilize the ΔTad measurement, similar to the accommodation phenomenon in hysteretic materials. In the mixed magnetic state inside the first-order transition, both low and high magnetization portions of the alloy exist and it varies considerably with t...
Highlights
Heusler alloys have been studied in recent years due to their wide useful applications such as shape memory alloys (Krumme et al, 2015)
The purpose of this paper is to investigate the history-dependent behavior of the spin-reorientations and its effect on the directly measured adiabatic temperature change (ΔTad) in a Ni51Mn33.4In15.6 Heusler alloy
Additional peaks and anomalies in the direct measurements of the adiabatic temperature change reflect the existence of spin reorientations and the temperature range where they happen
Summary
Heusler alloys have been studied in recent years due to their wide useful applications such as shape memory alloys (Krumme et al, 2015). Ni-Mn-based Heusler alloys have been the subjects of many studies because of their unusual and complex magnetic properties as well as their potential use as magnetocaloric devices (Du et al, 2007; Hütten et al, 2006; Krenke et al, 2007; Seyoum et al, 2013; Sharma, Chattopadhyay, & Roy, 2007). They are known to exhibit mixed magnetic states during the magnetostructural transformation resulting in a disorder and competing interactions between different magnetic sublattices (Aksoy, Acet, Deen, Mañosa, & Planes, 2009; Bennett et al, 2012; Ye et al, 2010). The purpose of this paper is to investigate the history-dependent behavior of the spin reorientations and its effect on the directly measured adiabatic temperature change (ΔTad) in a Ni51Mn33.4In15.6 Heusler alloy
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