Tailoring the magnetodynamic properties of nanomagnets using magnetocrystalline and shape anisotropies
2015 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 92, no 10, 104406Article in journal (Refereed) Published
Magnetodynamical properties of nanomagnets are affected by the demagnetizing fields created by the same nanoelements. In addition, magnetocrystalline anisotropy produces an effective field that also contributes to the spin dynamics. We show how the dimensions of magnetic elements can be used to balance crystalline and shape anisotropies, and that this can be used to tailor the magnetodynamic properties. We study ferromagnetic ellipses patterned from a 10-nm-thick epitaxial Fe film with dimensions ranging from 50x150 to 150x450 nm. The study combines ferromagnetic resonance (FMR) spectroscopy with analytical calculations and micromagnetic simulations, and proves that the dynamical properties can be effectively controlled by changing the size of the nanomagnets. We also show how edge defects in the samples influence the magnetization dynamics. Dynamical edge modes localized along the sample edges are strongly influenced by edge defects, and this needs to be taken into account in understanding the full FMR spectrum.
Place, publisher, year, edition, pages
2015. Vol. 92, no 10, 104406
Physical Sciences Engineering and Technology
IdentifiersURN: urn:nbn:se:uu:diva-264050DOI: 10.1103/PhysRevB.92.104406ISI: 000360961400003OAI: oai:DiVA.org:uu-264050DiVA: diva2:859183