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Summary: Configurational anisotropy and control of magnetic vortex chirality in arrays of circular Ni80Fe20
nanoscale dots
S. Jain, Y. Ren, and A. O. Adeyeye*
Information Storage Materials Laboratory, Department of Electrical and Computer Engineering, National University of Singapore,
Singapore 117576, Singapore
N. Singh
Institute of Microelectronics, A*STAR (Agency for Science, Technology and Research), Singapore 117685, Singapore
Received 21 May 2009; revised manuscript received 2 September 2009; published 5 October 2009
We present the experimental investigation and numerical analysis of the magnetostatic energy of ferromag-
netic circular dots arranged in three different lattice geometries. We show that by varying the lattice arrange-
ment, configurational anisotropy, which is significantly affected by the direction of the external magnetic field,
can be induced. Depending on the coupling mechanism ferromagnetic/antiferromagnetic between the neigh-
boring dots in the lattice, different combinations of chiralities in the vortex state can be obtained.
DOI: 10.1103/PhysRevB.80.132401 PACS number s : 75.60.Jk
Magnetostatic interactions in coupled nanodots have at-
tracted much attention in recent years.1,2 Fundamentally,
such systems are well suited for direct comparison between
theoretical predictions and experimental observations. Due to
the advancements in nanofabrication techniques,3 it is now
possible to precisely control the geometry, size, and interdot
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