Electron-phonon coupling in ferromagnetic Fe-Co alloys from first principles
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arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866909353693413376 |
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| author | Moseni, Kevin Wilson, Richard B Coh, Sinisa |
| author_facet | Moseni, Kevin Wilson, Richard B Coh, Sinisa |
| contents | The measured magnetization dynamics of ferromagnetic iron--cobalt Fe$_{1-x}$Co$_x$ alloys show a strong dependence on the alloy composition, especially near $x=0.25$. Here, we calculate from first principles the electron-phonon coupling strength in Fe$_{1-x}$Co$_x$ alloys for compositions ranging from $x=0$ to $x=0.75$. We find a strong, spin-dependent variation of the electron-phonon coupling strength with alloy composition, with a minimum near $x=0.25$. We analyze the variation of the electron-phonon interaction with composition, as a function of electron spin, density of states, electron-phonon matrix elements, character of electron wavefunction at the Fermi level, orbital-resolved strength of the phonon perturbing potential, and phonon frequencies. We calculate the electron-phonon energy transfer coefficients, and find that they are in qualitative agreement with the phenomenological electron-phonon energy transfer coefficient deduced from magnetization dynamics experiments. Our findings show that variations in the composition of ferromagnetic alloys can significantly alter the magnetization dynamics and transport properties. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_12650 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Electron-phonon coupling in ferromagnetic Fe-Co alloys from first principles Moseni, Kevin Wilson, Richard B Coh, Sinisa Materials Science The measured magnetization dynamics of ferromagnetic iron--cobalt Fe$_{1-x}$Co$_x$ alloys show a strong dependence on the alloy composition, especially near $x=0.25$. Here, we calculate from first principles the electron-phonon coupling strength in Fe$_{1-x}$Co$_x$ alloys for compositions ranging from $x=0$ to $x=0.75$. We find a strong, spin-dependent variation of the electron-phonon coupling strength with alloy composition, with a minimum near $x=0.25$. We analyze the variation of the electron-phonon interaction with composition, as a function of electron spin, density of states, electron-phonon matrix elements, character of electron wavefunction at the Fermi level, orbital-resolved strength of the phonon perturbing potential, and phonon frequencies. We calculate the electron-phonon energy transfer coefficients, and find that they are in qualitative agreement with the phenomenological electron-phonon energy transfer coefficient deduced from magnetization dynamics experiments. Our findings show that variations in the composition of ferromagnetic alloys can significantly alter the magnetization dynamics and transport properties. |
| title | Electron-phonon coupling in ferromagnetic Fe-Co alloys from first principles |
| topic | Materials Science |
| url | https://arxiv.org/abs/2402.12650 |