Manipulation of magnetic properties by tunable magnetic dipoles in a ferromagnetic thin film

dc.contributor.authorMaity, Tuhin
dc.contributor.authorRoy, Saibal
dc.contributor.funderScience Foundation Irelanden
dc.contributor.funderIrish Research Councilen
dc.description.abstractWe demonstrate how a unique nanomodulation within a continuous ferromagnetic film can induce magnetic dipoles at predefined, submicrometer scale locations, which can tune the global magnetic properties of the film due to dipole-dipole interactions. Arrays of tunable magnetic dipoles are generated with in-plane and out-of-plane directions, which can be rotated in-plane within the three-dimensional (3-D) modulated structure of a continuous film. In-plane magnetic dipole rotation enables a methodology to control overall magnetic properties of a ferromagnetic thin film. Formation of magnetic dipoles and their tunability were studied in detail by magnetic force microscopy, high-resolution magnetic measurements, and micromagnetic simulation of a nanomodulated Ni45Fe55 alloy film. A pattern larger than a single magnetic domain would normally form a vortex in the remanent state. However, here the unique 3-D nanostructure prevents vortex formation due to the competition between in-plane and out-of-plane dipole-dipole interaction giving rise to a metastable state. Experimentally, at zero remanence, the magnetization goes through a transformation from a metastable to a stable state, where the dipole-dipole interaction depends on their geometrical arrangement. Thus, the magnetic properties of the continuous film can be varied by the proposed pattern geometry. A detail analytical study of the dipolar energy for the system agrees well with the experimental and simulated results.en
dc.description.sponsorshipIrish Research Council (Project No. GOIPD/2016/474)en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.identifier.citationMaity, T. and Roy, S. (2017) 'Manipulation of magnetic properties by tunable magnetic dipoles in a ferromagnetic thin film', IEEE Magnetics Letters, 8, 4105404 (4pp). doi:10.1109/LMAG.2017.2685585en
dc.identifier.journaltitleIEEE Magnetics Lettersen
dc.publisherInstitute of Electrical and Electronics Engineers (IEEE)en
dc.relation.projectinfo:eu-repo/grantAgreement/SFI/SFI Principal Investigator Programme (PI)/11/PI/1201/IE/Vibration based wideband electromagnetic micropower generators on silicon: MEMS to NEMS/en
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dc.subjectMagnetic anisotropyen
dc.subjectMagnetic filmen
dc.subjectNanoimprint lithographyen
dc.subjectSoft magnetic materialsen
dc.subjectPerpendicular magnetic anisotropyen
dc.subjectMagnetic domainsen
dc.subjectMagnetic resonance imagingen
dc.subjectMagnetostatic wavesen
dc.titleManipulation of magnetic properties by tunable magnetic dipoles in a ferromagnetic thin filmen
dc.typeArticle (peer-reviewed)en
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