Ferromagnetic resonance in arrays of highly anisotropic nanoparticles

A. Butera ()

The European Physical Journal B: Condensed Matter and Complex Systems, 2006, vol. 52, issue 3, 297-303

Abstract: We present in this study computational simulations of the ferromagnetic resonance response of magnetic nanoparticles with a uniaxial anisotropy considerably larger than the microwave excitation frequency (in field units). The particles are assumed to be randomly oriented in a two dimensional lattice, and are coupled by dipolar interactions through an effective demagnetization field, which is proportional to the packing fraction. We have included in the model fluctuations in the anisotropy field (H K ) and allowed variations in the demagnetizing field. We then analyzed the line shape and line intensity as a function of both fields. We have found that when H K is increased the line shape changes drastically, with a structure of two lines appearing at high fields. The line intensity has a maximum when H K equals the frequency gap and decreases considerably for larger values of the anisotropy. The effects of fluctuations in H K and variations in the packing fraction have been also studied. Comparison with experimental data shows that the overall observed behavior is dominated by the particles with lower anisotropy. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2006

Keywords: 76.50.+g Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance, 75.30.Gw Magnetic anisotropy, 75.50.Tt Fine-particle systems; nanocrystalline materials, 75.75.+a Magnetic properties of nanostructures, (search for similar items in EconPapers)
Date: 2006
References: View complete reference list from CitEc
Citations:

Downloads: (external link)
http://hdl.handle.net/10.1140/epjb/e2006-00296-4 (text/html)
Access to full text is restricted to subscribers.

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:spr:eurphb:v:52:y:2006:i:3:p:297-303

Ordering information: This journal article can be ordered from
http://www.springer.com/economics/journal/10051

DOI: 10.1140/epjb/e2006-00296-4

Access Statistics for this article

The European Physical Journal B: Condensed Matter and Complex Systems is currently edited by P. Hänggi and Angel Rubio

More articles in The European Physical Journal B: Condensed Matter and Complex Systems from Springer, EDP Sciences
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().