Magnetic properties of Ge, Re and Cr substituted Fe$_5$SiB$_2$
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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| author | Casadei, M. Isah, M. M. Cabassi, R. Trevisi, G. Fabbrici, S. Belli, M. Fernández, C. de Julián Allodi, G. Fournée, V. Sanna, S. Albertini, F. |
| author_facet | Casadei, M. Isah, M. M. Cabassi, R. Trevisi, G. Fabbrici, S. Belli, M. Fernández, C. de Julián Allodi, G. Fournée, V. Sanna, S. Albertini, F. |
| contents | One of the possible approaches to decrease the demand for critical elements such as rare earths is to develop new sustainable magnets. Iron-based materials are suitable for gap magnets applications since iron is the most abundant ferromagnetic element on Earth. Fe$_5$SiB$_2$ is a candidate as gap magnet thanks to its high Curie temperature (T$_{\text{C}} \sim$ 800 K) and saturation magnetization (M$_{\text{S}}\sim$ 140 Am$^2$kg$^{-1}$). However its anisotropy field is too low for applications (H$_{\text{A}} \sim$ 0.8 T). In order to increase the anisotropy value, we synthesized a series of Ge, Re and Cr substituted Fe$_5$SiB$_2$ samples and studied their magnetic properties. They all crystallize in the Cr$_5$B$_3$-type tetragonal structure with the $I4/mcm$ space group. Curie temperature (T$_{\text{C}}$ = 803 K) and saturation magnetization (M$_{\text{S}}$ = 138 Am$^2$kg$^{-1}$) are slightly decreased by elemental substitution with Re having the largest effect. Despite being reduced, T$_{\text{C}}$ and M$_{\text{S}}$ still maintain significant values (T$_{\text{C}}>$ 750 K and M$_{\text{S}}$ = 118 Am$^2$kg$^{-1}$). The room temperature anisotropy field has been measured by Singular Point Detection (SPD) and increases by about 15% upon Re substitution, reaching 0.92 T for Fe$_{4.75}$Re$_{0.25}$SiB$_2$. We have also used Nuclear Magnetic Resonance and SPD measurements to study the spin reorientation transition which takes place at 172 K and we have found that it is partially suppressed by substitution of Ge from 172 K to 140 K and completely suppressed upon Cr and Re substitution. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2501_01547 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Magnetic properties of Ge, Re and Cr substituted Fe$_5$SiB$_2$ Casadei, M. Isah, M. M. Cabassi, R. Trevisi, G. Fabbrici, S. Belli, M. Fernández, C. de Julián Allodi, G. Fournée, V. Sanna, S. Albertini, F. Materials Science One of the possible approaches to decrease the demand for critical elements such as rare earths is to develop new sustainable magnets. Iron-based materials are suitable for gap magnets applications since iron is the most abundant ferromagnetic element on Earth. Fe$_5$SiB$_2$ is a candidate as gap magnet thanks to its high Curie temperature (T$_{\text{C}} \sim$ 800 K) and saturation magnetization (M$_{\text{S}}\sim$ 140 Am$^2$kg$^{-1}$). However its anisotropy field is too low for applications (H$_{\text{A}} \sim$ 0.8 T). In order to increase the anisotropy value, we synthesized a series of Ge, Re and Cr substituted Fe$_5$SiB$_2$ samples and studied their magnetic properties. They all crystallize in the Cr$_5$B$_3$-type tetragonal structure with the $I4/mcm$ space group. Curie temperature (T$_{\text{C}}$ = 803 K) and saturation magnetization (M$_{\text{S}}$ = 138 Am$^2$kg$^{-1}$) are slightly decreased by elemental substitution with Re having the largest effect. Despite being reduced, T$_{\text{C}}$ and M$_{\text{S}}$ still maintain significant values (T$_{\text{C}}>$ 750 K and M$_{\text{S}}$ = 118 Am$^2$kg$^{-1}$). The room temperature anisotropy field has been measured by Singular Point Detection (SPD) and increases by about 15% upon Re substitution, reaching 0.92 T for Fe$_{4.75}$Re$_{0.25}$SiB$_2$. We have also used Nuclear Magnetic Resonance and SPD measurements to study the spin reorientation transition which takes place at 172 K and we have found that it is partially suppressed by substitution of Ge from 172 K to 140 K and completely suppressed upon Cr and Re substitution. |
| title | Magnetic properties of Ge, Re and Cr substituted Fe$_5$SiB$_2$ |
| topic | Materials Science |
| url | https://arxiv.org/abs/2501.01547 |