Static and dynamic magnetic properties of Ni80 Fe20 square antidot arrays
Ημερομηνία
2009Συγγραφέας
Tse, D. H. Y.Steinmuller, S. J.
Trypiniotis, Theodossis
Anderson, D.
Jones, G. A. C.
Bland, J. A. C.
Barnes, C. H. W.
ISSN
1098-0121Source
Physical Review B - Condensed Matter and Materials PhysicsVolume
79Issue
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Metadata
Εμφάνιση πλήρους εγγραφήςΕπιτομή
We have investigated both static and dynamic magnetic properties of square antidot arrays in a ferromagnetic thin-film structure of Au (2 nm)/ Ni80 Fe20 (27.6 nm) on a SiO2 500 nm/Si substrate using magneto-optic Kerr effect magnetometry, Brillouin light scattering (BLS), and micromagnetic simulations. The antidot patterns were 1 µm square holes arranged in two separate square lattices of dot separations d=0.6 µm and 1.0 µm. The introduction of antidots induced an in-plane fourfold magnetic anisotropy with hard axes on the two nearest-antidot-neighbor directions. The coercive field, Hc, was increased by the presence of antidots. Fixed-frequency modes were observed in spin-wave dispersion relations in remanent spin configurations. These modes correspond to spin-wave confinement by antidot edges, which were seen as a series of nodal lines parallel to the edges in simulated spin-wave mode spatial mappings. Domains in remanent states, some of which were responsible for the existence of dipole-exchange backward volume modes seen in BLS spectra, were also found to confine spin waves in simulations. © 2009 The American Physical Society.