Origin of reduced magnetization and domain formation in small magnetite nanoparticles

The structural, chemical, and magnetic properties of magnetite nanoparticles are compared. Aberration corrected scanning transmission electron microscopy reveals the prevalence of antiphase boundaries in nanoparticles that have significantly reduced magnetization, relative to the bulk. Atomistic mag...

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Veröffentlicht in:	Scientific reports 2017-04, Vol.7 (1), p.45997-45997, Article 45997
Hauptverfasser:	Nedelkoski, Zlatko, Kepaptsoglou, Demie, Lari, Leonardo, Wen, Tianlong, Booth, Ryan A., Oberdick, Samuel D., Galindo, Pedro L., Ramasse, Quentin M., Evans, Richard F. L., Majetich, Sara, Lazarov, Vlado K.
Format:	Artikel
Sprache:	eng
Schlagworte:	639/766/119/997 639/925/357 Boundaries Electron microscopy Humanities and Social Sciences Magnetic properties magnetic properties and materials Magnetism Magnetite MATERIALS SCIENCE multidisciplinary Nanoparticles nanoscale materials Science Transmission electron microscopy
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Beschreibung
Zusammenfassung:	The structural, chemical, and magnetic properties of magnetite nanoparticles are compared. Aberration corrected scanning transmission electron microscopy reveals the prevalence of antiphase boundaries in nanoparticles that have significantly reduced magnetization, relative to the bulk. Atomistic magnetic modelling of nanoparticles with and without these defects reveals the origin of the reduced moment. Strong antiferromagnetic interactions across antiphase boundaries support multiple magnetic domains even in particles as small as 12–14 nm.
ISSN:	2045-2322 2045-2322
DOI:	10.1038/srep45997