Chiral Phonons Enhance Ferromagnetism
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arXiv
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| Autori principali: | , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866916688806543360 |
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| author | Fransson, Jonas Kapon, Yael Brann, Lilach Yochelis, Shira Sasselov, Dimitar D. Paltiel, Yossi Ozturk, S. Furkan |
| author_facet | Fransson, Jonas Kapon, Yael Brann, Lilach Yochelis, Shira Sasselov, Dimitar D. Paltiel, Yossi Ozturk, S. Furkan |
| contents | Recent experiments suggest that the conditions for ferromagnetic order in, e.g., magnetite, can be modified by adsorption of chiral molecules. Especially, the coercivity of magnetite was increased by nearly 100 \%, or 20 times the earth magnetic flux density, at room temperature. The coercivity was, moreover, demonstrated to increase linearly with temperature in a finite range around room temperature. Based on these results, a mechanism is proposed for providing the necessary enhancement of the magnetic anisotropy. It is shown that nuclear vibrations (phonons) coupled to ferromagnetic spin excitations (magnons) absorb the thermal energy in the system, thereby diverting the excess energy that otherwise would excite magnons in the ferromagnet. This energy diversion, not only restores the ferromagnetic order but also enhances its stability by increasing the anisotropy energy for magnon excitations. The coupling between phonons with magnons is enabled by chirality due to the lack of inversion symmetry. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_13787 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Chiral Phonons Enhance Ferromagnetism Fransson, Jonas Kapon, Yael Brann, Lilach Yochelis, Shira Sasselov, Dimitar D. Paltiel, Yossi Ozturk, S. Furkan Materials Science Chemical Physics Recent experiments suggest that the conditions for ferromagnetic order in, e.g., magnetite, can be modified by adsorption of chiral molecules. Especially, the coercivity of magnetite was increased by nearly 100 \%, or 20 times the earth magnetic flux density, at room temperature. The coercivity was, moreover, demonstrated to increase linearly with temperature in a finite range around room temperature. Based on these results, a mechanism is proposed for providing the necessary enhancement of the magnetic anisotropy. It is shown that nuclear vibrations (phonons) coupled to ferromagnetic spin excitations (magnons) absorb the thermal energy in the system, thereby diverting the excess energy that otherwise would excite magnons in the ferromagnet. This energy diversion, not only restores the ferromagnetic order but also enhances its stability by increasing the anisotropy energy for magnon excitations. The coupling between phonons with magnons is enabled by chirality due to the lack of inversion symmetry. |
| title | Chiral Phonons Enhance Ferromagnetism |
| topic | Materials Science Chemical Physics |
| url | https://arxiv.org/abs/2412.13787 |