Finite size effects in patterned magnetic permalloy films

G. Gubbiotti*, L. Albini, G. Carlotti, M. De Crescenzi, Enzo Di Fabrizio, A. Gerardino, O. Donzelli, F. Nizzoli, H. Koo, R. D. Gomez

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

Electron beam lithography has been used to prepare 250-Å-thick square-shaped permalloy dots whose width and separation are in the range between 1 and 4 μm. The static and dynamic magnetic properties of these structures have been investigated by complementary techniques such as magneto-optic Kerr effect (MOKE), magnetic force microscopy (MFM), and Brillouin light scattering (BLS). Longitudinal MOKE enabled us to compare the hysteresis loops of the specimens with different dot size and interdot separation, showing a marked influence of the demagnetizing field inside the dots. MFM images recorded at zero applied field showed that, depending on the interdot spacing, there is a prevalence of either four- or seven-domain patterns together with a minority of nonsolenoidal patterns that possess a net magnetic moment. BLS from thermally activated spin waves were then used to determine the intrinsic magnetic parameters of the permalloy films and to show evidence of the discretization of the spin-wave peak due to the wave vector resonance condition within each dot.

Original languageEnglish (US)
Pages (from-to)5633-5635
Number of pages3
JournalJournal of Applied Physics
Volume87
Issue number9 II
StatePublished - May 1 2000

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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