Ignoring your neighbors: Moment correlations dominated by indirect or distant interactions in an ordered nanomagnet array

Abstract

We have studied the moment correlations within triangular lattice arrays of single-domain co-aligned nanoscale ferromagnetic islands. Independent variation of lattice spacing along and perpendicular to the island axis tunes the magnetostatic interactions between islands through a broad range of relative strengths. For certain lattice parameters, the sign of the correlations between near-neighbor island moments is opposite to that favored by the pair-wise interaction. This finding, supported by analysis of the total correlation in terms of direct and convoluted indirect contributions across multiple pairwise interactions, indicates that indirect interactions and/or those mediated by further neighbors can be tuned to be dominant, with implications for the wide range of systems composed of interacting nanomagnets.

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• Dumping Topological Charges on Neighbors: Ice Manifolds for Colloids and Vortices
• Remagnetization in the array of ferromagnetic nanowires with periodic and quasiperiodic order
• Stiffness from Disorder in Triangular-Lattice Ising Thin Films
• Magnetic states and ferromagnetic resonance in geometrically frustrated arrays of multilayer ferromagnetic nanoparticles ordered on triangular lattices
• The Concept of Spin Ice Graphs and a Field Theory for their Topological Monopoles and Charges
• Energy levels of interacting curved nano-magnets in a frustrated geometry: increasing accuracy when using finite difference methods