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Polycrystalline texture causes magnetic instability in greigite

Lesniak, Barbara; Koulialias, Dimitrios; Charilaou, Michalis; Weidler, Peter G. 1; Rhodes, Jordan M.; Macdonald, Janet E.; Gehring, Andreas U.
1 Institut für Funktionelle Grenzflächen (IFG), Karlsruher Institut für Technologie (KIT)

Abstract:

Magnetic stability of iron mineral phases is a key for their use as paleomagnetic information carrier and their applications in nanotechnology, and it critically depends on the size of the particles and their texture. Ferrimagnetic greigite (Fe$_{3}$S$_{4}$) in nature and synthesized in the laboratory forms almost exclusively polycrystalline particles. Textural effects of inter-grown, nano-sized crystallites on the macroscopic magnetization remain unresolved because their experimental detection is challenging. Here, we use ferromagnetic resonance (FMR) spectroscopy and static magnetization measurements in concert with micromagnetic simulations to detect and explain textural effects on the magnetic stability in synthetic, polycrystalline greigite flakes. We demonstrate that these effects stem from inter-grown crystallites with mean coherence length (MCL) of about 20 nm in single-domain magnetic state, which generate modifiable coherent magnetization volume (CMV) configurations in the flakes. At room temperature, the instability of the CVM configuration is exhibited by the angular dependence of the FMR spectra in fields of less than 100 mT and its reset by stronger fields. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000134518
Veröffentlicht am 30.06.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Funktionelle Grenzflächen (IFG)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 12.2021
Sprache Englisch
Identifikator ISSN: 2045-2322
KITopen-ID: 1000134518
HGF-Programm 43.33.11 (POF IV, LK 01) Adaptive and Bioinstructive Materials Systems
Erschienen in Scientific reports
Verlag Nature Research
Band 11
Heft 1
Seiten Art. Nr.: 3024
Vorab online veröffentlicht am 04.02.2021
Nachgewiesen in Web of Science
Dimensions
Scopus
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