Ordered magnetic dipoles: controlling anisotropy in nanomodulated continuous ferromagnetic films

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dc.contributor.author Maity, Tuhin
dc.contributor.author Li, Shunpu
dc.contributor.author Keeney, Lynette
dc.contributor.author Roy, Saibal
dc.date.accessioned 2016-07-22T14:12:48Z
dc.date.available 2016-07-22T14:12:48Z
dc.date.issued 2012-07-30
dc.identifier.citation Maity, 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.86.024438 en
dc.identifier.volume 86 en
dc.identifier.startpage 024438-1 en
dc.identifier.endpage 024438-7 en
dc.identifier.issn 2469-9950
dc.identifier.issn 2469-9969
dc.identifier.uri http://hdl.handle.net/10468/2930
dc.identifier.doi 10.1103/PhysRevB.86.024438
dc.description.abstract In 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.sponsorship European 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.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher American Physical Society en
dc.rights © 2012 American Physical Society. en
dc.subject Thin films en
dc.subject Nanomagnets en
dc.subject Dependence en
dc.subject Transition en
dc.subject Roughness en
dc.title Ordered magnetic dipoles: controlling anisotropy in nanomodulated continuous ferromagnetic films en
dc.type Article (peer-reviewed) en
dc.internal.authorcontactother Lynette Keeney, Tyndall Photonics, University College Cork, Cork, Ireland. +353-21-490-3000 Email: lynette.keeney@tyndall.ie en
dc.internal.availability Full text available en
dc.date.updated 2014-09-03T10:30:30Z
dc.description.version Published Version en
dc.internal.rssid 190496017
dc.internal.wokid 000306923400008
dc.contributor.funder Science Foundation Ireland en
dc.contributor.funder European Commission
dc.description.status Peer reviewed en
dc.identifier.journaltitle Physical Review B en
dc.internal.copyrightchecked No. !!CORA!! Yes en
dc.internal.licenseacceptance Yes en
dc.internal.IRISemailaddress lynette.keeney@tyndall.ie en
dc.identifier.articleid 024438


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