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Accelerating the switching of magnetic nanoclusters by anisotropy-driven magnetization dynamics
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
2012 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 86, no 22, 224401- p.Article in journal (Refereed) Published
Abstract [en]

In this work, the magnetization dynamics of clusters supported on nonmagnetic substrates is shown to exhibit a complex response when subjected to external magnetic fields. The field-driven magnetization reversal of small Co clusters deposited on a Cu(111) surface has been studied by means of first-principles calculations and atomistic spin dynamics simulations. For applied fields ranging from 1 to 10 Tesla, we observe a coherent magnetization reversal with switching times in the range of several tenths of picoseconds to several nanoseconds, depending on the field strength. We find a nonmonotonous dependence of the switching times with respect to the strength of the applied field, which we prove has its origin in the complex magnetic anisotropy landscape of these low-dimensional systems. This effect is shown to be stable for temperatures around 10 K, and is possible to realize over a range of exchange interactions and anisotropy landscapes. Possible experimental routes to achieve this unique switching behavior are discussed.

Place, publisher, year, edition, pages
2012. Vol. 86, no 22, 224401- p.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-190315DOI: 10.1103/PhysRevB.86.224401ISI: 000311805700003OAI: oai:DiVA.org:uu-190315DiVA: diva2:585930
Available from: 2013-01-10 Created: 2013-01-07 Last updated: 2017-12-06Bibliographically approved

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Etz, CorinaCosta, MarcioEriksson, OlleBergman, Anders

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