Topic
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 paper, the fractional composition state functions for magnetocaloric metamagnets are formulated by utilizing the self-similarity phenomenon within the material's (∂M/∂T) curves.
Abstract: The understanding of how magnetocaloric metamagnets transition near the metamagnetic transition region is profoundly important to fundamental research and the application of near-room temperature magnetic refrigeration. Metamagnetic transition is characterized by field-induced transitions between the ferromagnetic (FM) and the paramagnetic (PM) state at temperatures above the Curie temperature. The metamagnetic region has been experimentally shown to exhibit coexistence of FM and PM phases attributed to the materials' intrinsically layered crystallographic structures. An analytical characterization approach is proposed to numerically calculate the fractional compositions of the mixed-state phases. The fractional composition state functions for magnetocaloric metamagnets are formulated by utilizing the self-similarity phenomenon within the material's (∂M/∂T)H curves. This self-similarity is demonstrated by the collapse of the (∂M/∂T)H curves at different field values onto a single scaled curve with low index of dispersion. To study the effectiveness of this new analytical approach, the fractional compositions functions for Gd5Si2Ge2 was evaluated. The calculated Gd5Si2Ge2 fractional composition state functions demonstrate considerable characteristic agreements with previous experimental results. Knowledge of the FM and PM cluster compositions near the metamagnetic region impacts the calculation of Maxwell's Relation and provides a new numerical perspective for enhancing the magnetocaloric properties via the methods of nano-engineering or chemical substitution processes.
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TL;DR: In this paper, the effects of external hydrostatic pressure and substitutions for U on magnetism in U 1− x Y(Lu) x CoAl compounds were studied, and the effect of external pressure and substitution of U for Y was shown to lead to a gradual development of ferromagnetism in a limited concentration range.
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TL;DR: The Gd 2 Cu 3 Sn 6, Tb 2 Cu 4 Sn 5 and Dy 2Cu 3.5 Sn 5.5 were prepared by arc melting, annealed at 670 K and characterized by XRPD and DSC analyses as discussed by the authors.
1 citations