Anisotropic magnetic properties and giant rotating magnetocaloric effect in double-perovskite Tb2CoMnO6
| Autor: | Donggun Oh, Myo-Jeong Kim, Noo Ri Lee, Ju Yeon Moon, Young Jai Choi, Jung-Sung Kim, Hyun Joo Shin |
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| Rok vydání: | 2018 |
| Předmět: |
Physics
Condensed matter physics 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Magnetization Positive entropy Magnetic anisotropy 0103 physical sciences Magnetic refrigeration Double perovskite 010306 general physics 0210 nano-technology Anisotropy Monoclinic crystal system Metamagnetism |
| Zdroj: | Physical Review B. 98 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.98.174424 |
| Popis: | We investigated the anisotropy of the magnetic and magnetocaloric properties of single-crystalline double-perovskite $\mathrm{T}{\mathrm{b}}_{2}\mathrm{CoMn}{\mathrm{O}}_{6}$, which crystallizes in a monoclinic $P{2}_{1}/n$ structure. Due to dissimilar magnetic anisotropy, the ferromagnetic order of the $\mathrm{C}{\mathrm{o}}^{2+}$ and $\mathrm{M}{\mathrm{n}}^{4+}$ moments emerges along the $c$ axis at ${T}_{\mathrm{C}}=100\phantom{\rule{0.16em}{0ex}}\mathrm{K}$, and the larger $\mathrm{T}{\mathrm{b}}^{3+}$ moments align perpendicular to the $c$ axis, below ${T}_{\mathrm{Tb}}=15\phantom{\rule{0.16em}{0ex}}\mathrm{K}$. The intricate temperature development of the metamagnetism along the $c$ axis results in a large negative change in the magnetic entropy at low temperature. On the other hand, the larger but almost reversible magnetization, perpendicular to the $c$ axis, results in a small and positive entropy change. This highly anisotropic magnetocaloric effect (MCE) leads to a giant rotational MCE, estimated to be $20.8\phantom{\rule{0.16em}{0ex}}\mathrm{J}/\mathrm{kg}\phantom{\rule{0.16em}{0ex}}\mathrm{K}$. Our findings, based on the magnetic anisotropy in $\mathrm{T}{\mathrm{b}}_{2}\mathrm{CoMn}{\mathrm{O}}_{6}$, enrich fundamental and applied research on magnetic materials, considering the distinct magnetic characteristics of double perovskites. |
| Databáze: | OpenAIRE |
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