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Pinning of thermal excitations at defects in artificial dipolar arrays: A theoretical investigation
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
2015 (English)In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, Vol. 386, 117-124 p.Article in journal (Refereed) Published
Abstract [en]

In this theoretical investigation we address the effect of defects on thermal excitations in square-lattice dipolar arrays. The samples consist of nanomagnets, whose geometry is adopted from recent experiments [A. Farhan et at, Nat. Phys. 9 (2013) 375] [131 and allows for thermal activation at room temperature. Various types of defects, all of which may be produced by microstructuring techniques, are introduced into the systems, It turns out that excitations can efficiently be pinned at detects. Furthermore, it is possible to produce ferromagnetic strings of nanomagnets that connect a pair of detects; their lengths are closely related to the distance of the defects and the topology of the magnetic ground-state configuration.

Place, publisher, year, edition, pages
2015. Vol. 386, 117-124 p.
Keyword [en]
Classical macrospin models, Dipolar arrays, Dipole-dipole interaction, Magnetic charges, Defects
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-252953DOI: 10.1016/j.jmmm.2015.03.048ISI: 000353174600020OAI: oai:DiVA.org:uu-252953DiVA: diva2:812842
Available from: 2015-05-20 Created: 2015-05-18 Last updated: 2015-05-20Bibliographically approved

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Thonig, Danny
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