Frequency-induced negative magnetic susceptibility in epoxy/magnetite nanocomposites

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 w...

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Autores principales:	Che-Hao Chang, Shih-Chieh Su, Tsun-Hsu Chang, Ching-Ray Chang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/050f3220125e47a09ca0f3328147d3bc
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spelling	oai:doaj.org-article:050f3220125e47a09ca0f3328147d3bc2021-12-02T14:11:29ZFrequency-induced negative magnetic susceptibility in epoxy/magnetite nanocomposites10.1038/s41598-021-82590-w2045-2322https://doaj.org/article/050f3220125e47a09ca0f3328147d3bc2021-02-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-82590-whttps://doaj.org/toc/2045-2322Abstract 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.Che-Hao ChangShih-Chieh SuTsun-Hsu ChangChing-Ray ChangNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Che-Hao Chang Shih-Chieh Su Tsun-Hsu Chang Ching-Ray Chang Frequency-induced negative magnetic susceptibility in epoxy/magnetite nanocomposites
description	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.
format	article
author	Che-Hao Chang Shih-Chieh Su Tsun-Hsu Chang Ching-Ray Chang
author_facet	Che-Hao Chang Shih-Chieh Su Tsun-Hsu Chang Ching-Ray Chang
author_sort	Che-Hao Chang
title	Frequency-induced negative magnetic susceptibility in epoxy/magnetite nanocomposites
title_short	Frequency-induced negative magnetic susceptibility in epoxy/magnetite nanocomposites
title_full	Frequency-induced negative magnetic susceptibility in epoxy/magnetite nanocomposites
title_fullStr	Frequency-induced negative magnetic susceptibility in epoxy/magnetite nanocomposites
title_full_unstemmed	Frequency-induced negative magnetic susceptibility in epoxy/magnetite nanocomposites
title_sort	frequency-induced negative magnetic susceptibility in epoxy/magnetite nanocomposites
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/050f3220125e47a09ca0f3328147d3bc
work_keys_str_mv	AT chehaochang frequencyinducednegativemagneticsusceptibilityinepoxymagnetitenanocomposites AT shihchiehsu frequencyinducednegativemagneticsusceptibilityinepoxymagnetitenanocomposites AT tsunhsuchang frequencyinducednegativemagneticsusceptibilityinepoxymagnetitenanocomposites AT chingraychang frequencyinducednegativemagneticsusceptibilityinepoxymagnetitenanocomposites
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Frequency-induced negative magnetic susceptibility in epoxy/magnetite nanocomposites

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