Dipole-Dipole Interaction in Arrays of Fe/FexOy Core/Shell Nanocubes Probed by Ferromagnetic Resonance

This paper represents a detailed theoretical study of the role of the long-range magnetic dipole-dipole interaction (DDI) evidenced by the ferromagnetic resonance (FMR) spectra for the ordered arrays of cubic nanoparticles. We show that the size of the array essentially controls the stability of the...

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Bibliographic Details
Published inIEEE transactions on magnetics Vol. 50; no. 12; pp. 1 - 9
Main Authors Sukhov, Alexander, Horley, Paul P., Berakdar, Jamal, Terwey, Alexandra, Meckenstock, Ralf, Farle, Michael
Format Journal Article
LanguageEnglish
Published New York IEEE 01.12.2014
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Anisotropic magnetoresistance
Frequency modulation
Iron
Magnetic anisotropy
Magnetic cores
Magnetic resonance
Magnetism
Nanoparticles
magnetization processes
Magnetic resonance
nanoparticles
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Summary:This paper represents a detailed theoretical study of the role of the long-range magnetic dipole-dipole interaction (DDI) evidenced by the ferromagnetic resonance (FMR) spectra for the ordered arrays of cubic nanoparticles. We show that the size of the array essentially controls the stability of the system, allowing us to suppress the intermittent low-field excitations starting from the arrays formed by 6 × 6 nanoparticles. Our numerical simulations allow us to determine the threshold inter-particle distance (around 80 ÷ 100nm), after which the DDI becomes negligible so that the FMR spectrum of the nanoparticle arrays becomes the same as the spectrum featured by a single nanoparticle. We also compare our simulations with experimental FMR-spectra of 24 Fe/Fe x O y nanocubes irregularly placed on a substrate.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2014.2329814