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Applied Physics Letters / Volume 97 / Issue 2 / MAGNETISM AND SUPERCONDUCTIVITY

Appl. Phys. Lett. 97, 022509 (2010); http://dx.doi.org/10.1063/1.3463482 (3 pages)

Charge ordering of magnetic dipoles in artificial honeycomb patterns

A. Schumann1, B. Sothmann2, P. Szary1, and H. Zabel1

1Institut für Experimentalphysik/Festkörperphysik, Ruhr-Universität Bochum, 44780 Bochum, Germany
2Theoretische Physik, CeNIDE, Universität Duisburg-Essen, 47048 Duisburg, Germany

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(Received 6 April 2010; accepted 17 June 2010; published online 15 July 2010)

Artificial spin ice offers the possibility to investigate a variety of dipolar orderings, spin frustrations and ground states. We have investigated magnetic dipoles arranged on a honeycomb lattice as a function of applied field, using magnetic force microscopy. The patterns were prepared by electron beam lithography where the basic units are polycrystalline Fe islands with dimensions length, width, and thickness of 3 μm, 0.3 μm, and 20 nm, respectively. These islands are in a single domain dipolar state at remanence. We have measured the magnetization reversal of the honeycomb patterns with different field directions. For the easy direction with the field parallel to one of the three dipole sublattices we observe at coercivity a maximum of magnetic charge order of alternating charges ±3, where the magnetic charge refers to the number and sign of magnetic poles pointing into any of the vertices.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

coercive force, electron beam lithography, iron, magnetic force microscopy, magnetic moments, magnetisation reversal, remanence

PACS

  • 75.30.Cr

    Saturation moments and magnetic susceptibilities

  • 75.60.Jk

    Magnetization reversal mechanisms

  • 75.50.Vv

    High coercivity materials

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3463482

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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