Quantum Saturation of Magnetoelectric Coupling in Fe$_3$O$_4$ Nanoparticles
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866909813314682880 |
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| author | Huang, Jian Aghabozorgi, Fatemeh Brock, Stephanie |
| author_facet | Huang, Jian Aghabozorgi, Fatemeh Brock, Stephanie |
| contents | We report magnetoelectric coupling in nanoparticle assemblies that persists to temperatures over 300 times lower than in previous studies. The ME response saturates at low temperature, revealing a quantum plateau of the coupling. A field dependence analysis shows a crossover from quadratic to linear behavior, captured by a phenomenological expansion $C(B,T) \simeq C_0(T) + a_1(T) B + a_2(T) B^2$. The magnitude of the extracted quadratic coefficient, $|a_2(T)|$, follows a power law $|a_2(T)| \sim T^{-α}$ with $α\approx 1.15$, indicating proximity to a quantum critical regime. The observed saturation reflects a new intrinsic energy scale, distinct from finite-size or extrinsic effects. These results establish nanoparticle assemblies as a new platform for studying quantum magnetoelectric phenomena. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2509_24131 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Quantum Saturation of Magnetoelectric Coupling in Fe$_3$O$_4$ Nanoparticles Huang, Jian Aghabozorgi, Fatemeh Brock, Stephanie Mesoscale and Nanoscale Physics Strongly Correlated Electrons We report magnetoelectric coupling in nanoparticle assemblies that persists to temperatures over 300 times lower than in previous studies. The ME response saturates at low temperature, revealing a quantum plateau of the coupling. A field dependence analysis shows a crossover from quadratic to linear behavior, captured by a phenomenological expansion $C(B,T) \simeq C_0(T) + a_1(T) B + a_2(T) B^2$. The magnitude of the extracted quadratic coefficient, $|a_2(T)|$, follows a power law $|a_2(T)| \sim T^{-α}$ with $α\approx 1.15$, indicating proximity to a quantum critical regime. The observed saturation reflects a new intrinsic energy scale, distinct from finite-size or extrinsic effects. These results establish nanoparticle assemblies as a new platform for studying quantum magnetoelectric phenomena. |
| title | Quantum Saturation of Magnetoelectric Coupling in Fe$_3$O$_4$ Nanoparticles |
| topic | Mesoscale and Nanoscale Physics Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2509.24131 |