Ordered magnetic dipoles: controlling anisotropy in nanomodulated continuous ferromagnetic films

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dc.contributor.authorMaity, Tuhin
dc.contributor.authorLi, Shunpu
dc.contributor.authorKeeney, Lynette
dc.contributor.authorRoy, Saibal
dc.contributor.funderScience Foundation Irelanden
dc.contributor.funderEuropean Commission
dc.date.accessioned2016-07-22T14:12:48Z
dc.date.available2016-07-22T14:12:48Z
dc.date.issued2012-07-30
dc.date.updated2014-09-03T10:30:30Z
dc.description.abstractIn this paper, the research focus is how to entangle magnetic dipoles to control/engineer magnetic properties of different devices at a submicron/nano scale. Here, we report the generation of synthetic arrays of tunable magnetic dipoles in a nanomodulated continuous ferromagnetic film. In-plane magnetic field rotations in modulated Ni 45Fe 55 revealed various rotational symmetries of magnetic anisotropy due to dipolar interaction with a crossover from lower to higher fold as a function of modulation geometry. Additionally, the effect of aspect ratio on symmetry shows a novel phase shift of anisotropy, which could be critical to manipulate the overall magnetic properties of the patterned film. The tendency to form vortex is in fact found to be very small, which highlights that the strong coupling between metastable dipoles is more favorable than vortex formation to minimize energy in this nanomodulated structure. This has further been corroborated by the observation of step hysteresis, magnetic force microscopy images of tunable magnetic dipoles, and quantitative micromagnetic simulations. An analytical expression has been derived to estimate the overall anisotropy accurately for nanomodulated film having low magnetocrystaline anisotropy. Derived mathematical expressions based on magnetic dipolar interaction are found to be in good agreement with our results.en
dc.description.sponsorshipEuropean Commission (EU FP7 Network of Excellence (NoE) project “NANOFUNCTION” Grant No. 257375); Science Foundation Ireland (SFI Principal Investigator (PI) Project No. 11/PI/1201; SFI FORME Strategic Research Cluster Award No. 07/SRC/I1172)en
dc.description.statusPeer revieweden
dc.description.versionPublished Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.articleid024438
dc.identifier.citationMaity, T., Li, S., Keeney, L. and Roy, S. (2012) 'Ordered magnetic dipoles: controlling anisotropy in nanomodulated continuous ferromagnetic films'. Physical Review B, 86, 024438. http://link.aps.org/doi/10.1103/PhysRevB.86.024438en
dc.identifier.doi10.1103/PhysRevB.86.024438
dc.identifier.endpage024438-7en
dc.identifier.issn2469-9950
dc.identifier.issn2469-9969
dc.identifier.journaltitlePhysical Review Ben
dc.identifier.startpage024438-1en
dc.identifier.urihttps://hdl.handle.net/10468/2930
dc.identifier.volume86en
dc.language.isoenen
dc.publisherAmerican Physical Societyen
dc.rights© 2012 American Physical Society.en
dc.subjectThin filmsen
dc.subjectNanomagnetsen
dc.subjectDependenceen
dc.subjectTransitionen
dc.subjectRoughnessen
dc.titleOrdered magnetic dipoles: controlling anisotropy in nanomodulated continuous ferromagnetic filmsen
dc.typeArticle (peer-reviewed)en
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