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Static and dynamic properties of patterned magnetic permalloy films

1997; Elsevier BV; Volume: 175; Issue: 1-2 Linguagem: Inglês

10.1016/s0304-8853(97)00150-9

1873-4766

B. Hillebrands, Chantal Mathieu, Claudia Hartmann, M. Bauer, O. Büttner, S. Riedling, B.F.P. Roos, S. O. Demokritov, B. Bartenlian, C. Chappert, D. Decanini, F. Rousseaux, E. Cambril, A. Müller, B. Hoffmann, Uwe Hartmann,

Physics of Superconductivity and Magnetism

Static magnetic and spin-wave properties of square lattices of permalloy micron dots with thicknesses of 500 Å and 1000 Å and with varying dot separations have been investigated. The spin-wave frequencies can be well described taking into account the demagnetization factor of each single dot. A magnetic fourfold anisotropy was found for the lattice with dot diameters of 1 μm and a dot separation of 0.1 μm. The anisotropy is attributed to an anisotropic dipole-dipole interaction between magnetically unsaturated parts of the dots. The anisotropy strength (order of 105 erg/cm3) decreases with increasing in-plane applied magnetic field.