Spin-Wave-Assisted Thermal Reversal of Epitaxial Perpendicular Magnetic Nanodots
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arXiv
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866914670133116928 |
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| author | Rohart, S. Campiglio, P. Repain, V. Nahas, Y. Chacon, C. Girard, Y. Lagoute, J. Thiaville, A. Rousset, S. |
| author_facet | Rohart, S. Campiglio, P. Repain, V. Nahas, Y. Chacon, C. Girard, Y. Lagoute, J. Thiaville, A. Rousset, S. |
| contents | The magnetic susceptibility of self-organized two-dimensional Co nanodots on Au(111) has been measured as a function of their size in the 2-7~nm diameter range. We show that the activation energy for the thermal reversal displays a power law behavior with the dot volume. Atomic scale simulations based on the Heisenberg hamiltonian show that this behavior is due to a deviation from the macrospin model for dot size as small as 3~nm in diameter. This discrepancy is attributed to finite temperature effects through the thermal excitation of spin-wave modes inside the particles |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_04903 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Spin-Wave-Assisted Thermal Reversal of Epitaxial Perpendicular Magnetic Nanodots Rohart, S. Campiglio, P. Repain, V. Nahas, Y. Chacon, C. Girard, Y. Lagoute, J. Thiaville, A. Rousset, S. Mesoscale and Nanoscale Physics The magnetic susceptibility of self-organized two-dimensional Co nanodots on Au(111) has been measured as a function of their size in the 2-7~nm diameter range. We show that the activation energy for the thermal reversal displays a power law behavior with the dot volume. Atomic scale simulations based on the Heisenberg hamiltonian show that this behavior is due to a deviation from the macrospin model for dot size as small as 3~nm in diameter. This discrepancy is attributed to finite temperature effects through the thermal excitation of spin-wave modes inside the particles |
| title | Spin-Wave-Assisted Thermal Reversal of Epitaxial Perpendicular Magnetic Nanodots |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2402.04903 |