Single crystalline superstructured stable single domain magnetite nanoparticles

Victoria Reichel, András Kovács, Monika Kumari, Éva Bereczk-Tompa, Emanuel Schneck, Patrick Diehle, M. Pósfai, Ann M. Hirt, Martial Duchamp, Rafal E. Dunin-Borkowski, Damien Faivre

Research output: Article

19 Citations (Scopus)

Abstract

Magnetite nanoparticles exhibit magnetic properties that are size and organization dependent and, for applications that rely on their magnetic state, they usually have to be monodisperse. Forming such particles, however, has remained a challenge. Here, we synthesize 40 nm particles of magnetite in the presence of polyarginine and show that they are composed of 10 nm building blocks, yet diffract like single crystals. We use both bulk magnetic measurements and magnetic induction maps recorded from individual particles using off-axis electron holography to show that each 40 nm particle typically contains a single magnetic domain. The magnetic state is therefore determined primarily by the size of the superstructure and not by the sizes of the constituent sub-units. Our results fundamentally demonstrate the structure - property relationship in a magnetic mesoparticle.

Original languageEnglish
Article number45484
JournalScientific Reports
Volume7
DOIs
Publication statusPublished - márc. 30 2017

ASJC Scopus subject areas

  • General

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    Reichel, V., Kovács, A., Kumari, M., Bereczk-Tompa, É., Schneck, E., Diehle, P., Pósfai, M., Hirt, A. M., Duchamp, M., Dunin-Borkowski, R. E., & Faivre, D. (2017). Single crystalline superstructured stable single domain magnetite nanoparticles. Scientific Reports, 7, [45484]. https://doi.org/10.1038/srep45484