Anisotropic magnetic coupling of permalloy micron dots forming a square lattice
Chantal Mathieu(University of Kaiserslautern), Claudia Hartmann(University of Kaiserslautern), M. Bauer(University of Kaiserslautern), O. Buettner(University of Kaiserslautern), S. Riedling(University of Kaiserslautern), B.F.P. Roos(University of Kaiserslautern), S. O. Demokritov(University of Kaiserslautern), B. Hillebrands(University of Kaiserslautern), B. Bartenlian(Université Paris-Sud), C. Chappert(Université Paris-Sud), D. Decanini, F. Rousseaux, E. Cambril, A. Müller, B. Hoffmann, Uwe Hartmann
Cited by 115Open Access
Abstract
Static magnetic and spin wave properties of square lattices of permalloy micron dots with thicknesses of 500 and 1000 Å and with varying dot separations have been investigated. 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.
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