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| Main Authors: | , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2501.15141 |
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| _version_ | 1866929688209784832 |
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| author | Papari, Gian Paolo Mazaheri, Zahra Presti, Francesca Lo Malandrino, Graziella Andreone, Antonello |
| author_facet | Papari, Gian Paolo Mazaheri, Zahra Presti, Francesca Lo Malandrino, Graziella Andreone, Antonello |
| contents | The electrodynamic properties of BiFeO$_3$ films in the THz region are investigated via time domain spectroscopy. Combining the use of transmission ($\tilde{T}$) and reflection ($\tilde{R}$) measurements under normal incidence, the refractive index and impedance of the samples under test are evaluated using a retrieval method. From $\tilde{T}$(($\tilde{R}$)) data two complex functions describing the refractive index $\tilde{n}_T$ ($\tilde{n}_R$) and impedance $\tilde{z}_T$ ($\tilde{z}_R$) are extracted from the independent minimization of the error functions given by the difference between the theoretical model and measurements. Knowledge of the pairs ($\tilde{n}_T, \tilde{n}_R$) and ($\tilde{z}_T, \tilde{z}_R$) enables to calculate with a high accuracy both complex permittivity $\tilde{\varepsilon}$ and permeability $\tildeμ$ of the sample. Signatures of magnetoelectric effects and phononic resonances are observed in the permittivity and permeability functions and discussed in detail. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_15141 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Accurate THz Measurements of Permittivity and Permeability of BiFeO$_3$ Thin Films Papari, Gian Paolo Mazaheri, Zahra Presti, Francesca Lo Malandrino, Graziella Andreone, Antonello Materials Science Optics The electrodynamic properties of BiFeO$_3$ films in the THz region are investigated via time domain spectroscopy. Combining the use of transmission ($\tilde{T}$) and reflection ($\tilde{R}$) measurements under normal incidence, the refractive index and impedance of the samples under test are evaluated using a retrieval method. From $\tilde{T}$(($\tilde{R}$)) data two complex functions describing the refractive index $\tilde{n}_T$ ($\tilde{n}_R$) and impedance $\tilde{z}_T$ ($\tilde{z}_R$) are extracted from the independent minimization of the error functions given by the difference between the theoretical model and measurements. Knowledge of the pairs ($\tilde{n}_T, \tilde{n}_R$) and ($\tilde{z}_T, \tilde{z}_R$) enables to calculate with a high accuracy both complex permittivity $\tilde{\varepsilon}$ and permeability $\tildeμ$ of the sample. Signatures of magnetoelectric effects and phononic resonances are observed in the permittivity and permeability functions and discussed in detail. |
| title | Accurate THz Measurements of Permittivity and Permeability of BiFeO$_3$ Thin Films |
| topic | Materials Science Optics |
| url | https://arxiv.org/abs/2501.15141 |