Vortex State Suppression in a Hexagonal Array of Interacting Py Triangular Rings

F. Spizzoa, L. Patrignani b, D. Bisero a, P. Vavassoria,c and V. Metlushko d aCNISM & Department of Physics and Earth Sciences, University of Ferrara, via G. Saragat 1, I-44122 Italy bImperial College of London, Blackett Laboratory, London SW7 2BW, UK cCIC nanoGUNE Consolider, Tolosa Hiribidea 76, E-20018 Donostia-San Sebastián, Spain dDept. of Electrical and Computer Eng., University of Illinois, Chicago, Illinois 60612, USA

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We investigate the effect of magnetostatic interactions on the magnetization reversal process of equilateral triangular rings arranged on a hexagonal lattice. Inter-ring interactions originate as rings corners host domain-walls that produce an intense dipolar field; The effect of such interactions is studied by recording hysteresis loops for different magnetic field orientations. Rings magnetic configuration is probed via magnetic force microscopy and diffraction magneto-optic Kerr effect measurements. We observe that the effect of stray fields due to domain-walls competes with that of shape anisotropy, and that the former prevails when the magnetic field orientation is parallel to rings symmetry axes.

DOI: 10.12693/APhysPolA.123.218 PACS numbers: 75.60.Jk, 75.75.Fk, 75.30.Gw