Journal article
Jonas Fransson, Yael Kapon, Lilach Brann, S. Yochelis, D. Sasselov, Y. Paltiel, S. Furkan Ozturk
2024
2024
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APA
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Fransson, J., Kapon, Y., Brann, L., Yochelis, S., Sasselov, D., Paltiel, Y., & Ozturk, S. F. (2024). Chiral Phonons Enhance Ferromagnetism.
Chicago/Turabian
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Fransson, Jonas, Yael Kapon, Lilach Brann, S. Yochelis, D. Sasselov, Y. Paltiel, and S. Furkan Ozturk. “Chiral Phonons Enhance Ferromagnetism” (2024).
MLA
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Fransson, Jonas, et al. Chiral Phonons Enhance Ferromagnetism. 2024.
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@article{jonas2024a,
title = {Chiral Phonons Enhance Ferromagnetism},
year = {2024},
author = {Fransson, Jonas and Kapon, Yael and Brann, Lilach and Yochelis, S. and Sasselov, D. and Paltiel, Y. and Ozturk, S. Furkan}
}
Abstract
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.