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- Title
Frequency-induced negative magnetic susceptibility in epoxy/magnetite nanocomposites.
- Authors
Chang, Che-Hao; Su, Shih-Chieh; Chang, Tsun-Hsu; Chang, Ching-Ray
- Abstract
The epoxy/magnetite nanocomposites express superparamagnetism under a static or low-frequency electromagnetic field. At the microwave frequency, said the X-band, the nanocomposites reveal an unexpected diamagnetism. To explain the intriguing phenomenon, we revisit the Debye relaxation law with the memory effect. The magnetization vector of the magnetite is unable to synchronize with the rapidly changing magnetic field, and it contributes to diamagnetism, a negative magnetic susceptibility for nanoparticles. The model just developed and the fitting result can not only be used to explain the experimental data in the X-band but also can be used to estimate the transition frequency between paramagnetism and diamagnetism.
- Subjects
MAGNETIC susceptibility; NANOCOMPOSITE materials; SUPERPARAMAGNETIC materials; ELECTROMAGNETIC fields; DIAMAGNETISM; DEBYE'S theory; NANOPARTICLES
- Publication
Scientific Reports, 2021, Vol 11, Issue 1, p1
- ISSN
2045-2322
- Publication type
Article
- DOI
10.1038/s41598-021-82590-w