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Metamagnetism
About: Metamagnetism is a research topic. Over the lifetime, 2023 publications have been published within this topic receiving 38108 citations.
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TL;DR: In this article, the authors developed a computational model to investigate the magnetic and structural phase transitions in metamagnetic shape memory alloys, which combined the phase-field method with micromagnetic simulations.
28 citations
TL;DR: In this paper, a comparative study of ΔS and Δρ has been performed on polycrystalline GdRu2Si2, showing that the anomalous regions of Δρ, where it is not dominated by the change in the orientation of magnetic moments, have been highlighted by showing the difference in the variation in ΔS.
Abstract: Studies on magnetocaloric effect (change in magnetic entropy ΔS) and magnetotransport (difference in resistivity due to magnetic field Δρ) have been performed on polycrystalline GdRu2Si2. Due to the presence of several field-induced metamagnetic transitions and superzone energy gap effect below the antiferromagnetic transition temperature (∼45 K), the system exhibits complex magnetotransport behavior. Such a complicated magnetotransport behavior has been analyzed by the comparative studies on Δρ and ΔS. The anomalous regions of Δρ, where it is not dominated by the change in the orientation of magnetic moments, have been highlighted by showing the difference in the variation in ΔS and Δρ. The origin of similar and dissimilar behaviors of ΔS and Δρ at different regions of temperature and magnetic field has been discussed. The comparative study of ΔS and Δρ indicates that it is a powerful technique to understand the complex magnetotransport behavior of the magnetic materials. Interestingly, the intricate mag...
28 citations
TL;DR: In this article, the authors report the importance of metamagnetism for the giant magnetocaloric effect in lanthanum manganites and the key role of oxygen deficiency for this phenomenon.
Abstract: We report the importance of metamagnetism for the giant magnetocaloric effect in lanthanum manganites and the key role of oxygen deficiency for this phenomenon. It is found that La0.7Ca0.3−xSrxMnO3−δ samples with x=0.0, 0.025, 0.05, 0.075, 0.1, and 0.125 are orthorhombic (O) phase, while those with x=0.15, 0.175, 0.2, and 0.3 are rhombohedral (R) phase at room temperature. The samples possess relatively high oxygen deficiency δ. With increasing x, the oxygen content increases from about 2.92 to 2.94 in the O phase and from 2.93 to 2.97 in the R phase, while it decreases in the vicinity of the O-R phase transition. The Curie temperature increases with increasing x in both the structural phases and shows a positive jump around the O-R phase transition. The x=0 sample shows S-shape magnetization, which is typical for metamagnetic materials. The S shape is continuously suppressed with increase in Sr and disappears for x≥0.075. Interestingly, the magnetic entropy change, adiabatic temperature change, and refri...
28 citations
TL;DR: A summary of extensive measurements of magnetisation isotherms and of the field and temperature-dependent AC susceptibility for Ni-Mn-Ga alloys is presented in this paper, where a quantitative appraisal of the magnetic phase transitions in this system through the establishment of metamagnetic boundaries at first-order magnetic/martensitic structural transitions and crossover lines at continuous magnetic transitions is provided.
28 citations
TL;DR: In this article, the magnetocaloric effect was examined for ErCo 2, which shows a first-order ferrimagnetic to paramagnetic transition at 32 K. The results strongly suggest that ErCo has a high potential for a working substance of magnetic refrigeration at 30-50 K.
28 citations