Electronic mechanism of sub-100-fs demagnetization induced by a femtosecond light pulse
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arXiv
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866917508352573440 |
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| author | Kapcia, Konrad J. Tkachenko, Victor Capotondi, Flavio Lichtenstein, Alexander Molodtsov, Serguei Piekarz, Przemysław Ziaja, Beata |
| author_facet | Kapcia, Konrad J. Tkachenko, Victor Capotondi, Flavio Lichtenstein, Alexander Molodtsov, Serguei Piekarz, Przemysław Ziaja, Beata |
| contents | A quantitative understanding of the processes that trigger light-induced demagnetization on ultrashort timescales is crucial for achieving an ultrafast, radiation-controlled magnetic response in materials. This milestone is essential for developing next-generation magnetic storage devices and ultrafast magnetic switches. In this theoretical study, we investigated demagnetization triggered in a single magnetic domain by light pulses ranging from a few to a few tens of femtoseconds in duration, with photon energies spanning the optical and X-ray regimes, under strongly non-equilibrium conditions. We predicted a loss of magnetization in the sub-100-fs range in all cases, primarily due to the excitation of the electronic system and the subsequent redistribution of electrons within the magneto-sensitive band. The considered timescales were too short for phonon-mediated processes or inter-site Heisenberg exchange processes to contribute significantly. These findings pave the way for highly accurate, radiation-driven magnetization control in magnetic materials at sub-100-femtosecond timescales with potential practical applications. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2605_18638 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Electronic mechanism of sub-100-fs demagnetization induced by a femtosecond light pulse Kapcia, Konrad J. Tkachenko, Victor Capotondi, Flavio Lichtenstein, Alexander Molodtsov, Serguei Piekarz, Przemysław Ziaja, Beata Materials Science Other Condensed Matter Atomic Physics Computational Physics Optics A quantitative understanding of the processes that trigger light-induced demagnetization on ultrashort timescales is crucial for achieving an ultrafast, radiation-controlled magnetic response in materials. This milestone is essential for developing next-generation magnetic storage devices and ultrafast magnetic switches. In this theoretical study, we investigated demagnetization triggered in a single magnetic domain by light pulses ranging from a few to a few tens of femtoseconds in duration, with photon energies spanning the optical and X-ray regimes, under strongly non-equilibrium conditions. We predicted a loss of magnetization in the sub-100-fs range in all cases, primarily due to the excitation of the electronic system and the subsequent redistribution of electrons within the magneto-sensitive band. The considered timescales were too short for phonon-mediated processes or inter-site Heisenberg exchange processes to contribute significantly. These findings pave the way for highly accurate, radiation-driven magnetization control in magnetic materials at sub-100-femtosecond timescales with potential practical applications. |
| title | Electronic mechanism of sub-100-fs demagnetization induced by a femtosecond light pulse |
| topic | Materials Science Other Condensed Matter Atomic Physics Computational Physics Optics |
| url | https://arxiv.org/abs/2605.18638 |