Rotating Magnetocaloric Effect in First-order Phase Transition Material Gd5Si2Ge2
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2026
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866914267072036864 |
|---|---|
| author | Almeida, Rafael Kiefe, Rodrigo Pinto, Ricardo Moura Costa Amaral, João Sequeira Dixon-Anderson, Kyle Mudryk, Yaroslav Araújo, João Pedro Belo, João Horta |
| author_facet | Almeida, Rafael Kiefe, Rodrigo Pinto, Ricardo Moura Costa Amaral, João Sequeira Dixon-Anderson, Kyle Mudryk, Yaroslav Araújo, João Pedro Belo, João Horta |
| contents | The rotating magnetocaloric effect (RMCE) induced by self-demagnetization has been investigated in the giant magnetocaloric effect (GMCE) material Gd$_5$Si$_2$Ge$_2$. This shape-dependent effect had thus far only been reported in pure Gd, marking this as the first analysis of the effect in a sample with a magnetostructural first-order phase transition. By rotating the applied magnetic field vector while keeping its intensity constant, the demagnetizing field within a high-aspect ratio sample changes significantly, resulting in a RMCE. We characterize RMCE by determining the adiabatic temperature change ($ΔT_{ad}^{rot}$) directly through temperature measurements, and the isothermal entropy change ($ΔS_M^{rot}$) via magnetometry and magnetostatic simulations. We obtain a remarkable maximum $ΔT_{ad}^{rot}$ of 1.77 K for a constant external field of 0.8 T, higher than that obtained under 1.0 T. The magnetostatic simulations not only corroborate the highly non-monotonous field-dependence of $|ΔS_{M}^{rot}|$, which reaches 95\% of its maximum value at 0.8 T, 6.12 J K$^{-1}$ kg$^{-1}$ for the experimentally measured shape, but also estimate a 35\% increase in the maximum $|ΔS_{M}^{rot}|$ up to 8.67 J K$^{-1}$ kg$^{-1}$ in a simulated shape with higher aspect ratio. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_13239 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Rotating Magnetocaloric Effect in First-order Phase Transition Material Gd5Si2Ge2 Almeida, Rafael Kiefe, Rodrigo Pinto, Ricardo Moura Costa Amaral, João Sequeira Dixon-Anderson, Kyle Mudryk, Yaroslav Araújo, João Pedro Belo, João Horta Materials Science Applied Physics The rotating magnetocaloric effect (RMCE) induced by self-demagnetization has been investigated in the giant magnetocaloric effect (GMCE) material Gd$_5$Si$_2$Ge$_2$. This shape-dependent effect had thus far only been reported in pure Gd, marking this as the first analysis of the effect in a sample with a magnetostructural first-order phase transition. By rotating the applied magnetic field vector while keeping its intensity constant, the demagnetizing field within a high-aspect ratio sample changes significantly, resulting in a RMCE. We characterize RMCE by determining the adiabatic temperature change ($ΔT_{ad}^{rot}$) directly through temperature measurements, and the isothermal entropy change ($ΔS_M^{rot}$) via magnetometry and magnetostatic simulations. We obtain a remarkable maximum $ΔT_{ad}^{rot}$ of 1.77 K for a constant external field of 0.8 T, higher than that obtained under 1.0 T. The magnetostatic simulations not only corroborate the highly non-monotonous field-dependence of $|ΔS_{M}^{rot}|$, which reaches 95\% of its maximum value at 0.8 T, 6.12 J K$^{-1}$ kg$^{-1}$ for the experimentally measured shape, but also estimate a 35\% increase in the maximum $|ΔS_{M}^{rot}|$ up to 8.67 J K$^{-1}$ kg$^{-1}$ in a simulated shape with higher aspect ratio. |
| title | Rotating Magnetocaloric Effect in First-order Phase Transition Material Gd5Si2Ge2 |
| topic | Materials Science Applied Physics |
| url | https://arxiv.org/abs/2601.13239 |