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Magnetic tunneling with CNT-based metamaterial
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SYSNO ASEP 0503954 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Magnetic tunneling with CNT-based metamaterial Author(s) Kletetschka, Günther (GLU-S) RID, SAI, ORCID
Inoue, J. (JP)
Lindauer, J. (CZ)
Hůlka, Z. (CZ)Article number 2551 Source Title Scientific Reports. - : Nature Publishing Group - ISSN 2045-2322
Roč. 9, č. 1 (2019)Number of pages 6 s. Publication form Print - P Language eng - English Country GB - United Kingdom Keywords carbon nanotubes ; remanent magnetization ; magnetic property ; magnetite Subject RIV DB - Geology ; Mineralogy OECD category Geology Method of publishing Open access Institutional support GLU-S - RVO:67985831 UT WOS 000459399400020 EID SCOPUS 85062012481 DOI 10.1038/s41598-019-39325-9 Annotation Multiwall carbon nanotubes (MWCNTs) fabricated by chemical vapor deposition contain magnetic nanoparticles. While increasing frequency of electromagnetic field (EMF) exposure (up to <10 kHz) of MWCNTs resulted in slight induced magnetization decrease due to skin effect of the conducting carbon, we discovered that higher frequencies (>10 kHz) contained an exponential magnetization increase. We show that puzzling magnetization increase with decreasing magnetic field amplitude (less than 0.5 A/m for 512 kHz) is due to matching the field amplitudes of the magnetic nanoparticles inside nanotubes. This observation reveals a possibility of magnetic tunneling in MWCNTs (change of magnetic state of blocked magnetic moments). This interpretation is supported by observation of unblocking larger magnetic remanence (MR) portion from MWCNTs with progressively smaller amplitude of oscillating magnetic field. Workplace Institute of Geology Contact Jana Popelková, popelkova@gli.cas.cz, Sabina Janíčková, Tel.: 233 087 272 Year of Publishing 2020 Electronic address https://www.nature.com/articles/s41598-019-39325-9
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