Tunable short-wavelength spin wave excitation from pinned magnetic domain walls

dc.contributorAalto Universityen
dc.contributor.authorVan De Wiele, Ben
dc.contributor.authorHämälaïnen, Sampo J.
dc.contributor.authorBaláz, Pavel
dc.contributor.authorMontoncello, Federico
dc.contributor.authorVan Dijken, Sebastiaan
dc.contributor.departmentGhent University
dc.contributor.departmentCharles University
dc.contributor.departmentUniversity of Ferrara
dc.contributor.departmentDepartment of Applied Physics
dc.description| openaire: EC/H2020/665215/EU//EMOTION | openaire: EC/FP7/307502/EU//E-CONTROL
dc.description.abstractMiniaturization of magnonic devices for wave-like computing requires emission of short-wavelength spin waves, a key feature that cannot be achieved with microwave antennas. In this paper, we propose a tunable source of short-wavelength spin waves based on highly localized and strongly pinned magnetic domain walls in ferroelectric-ferromagnetic bilayers. When driven into oscillation by a microwave spin-polarized current, the magnetic domain walls emit spin waves with the same frequency as the excitation current. The amplitude of the emitted spin waves and the range of attainable excitation frequencies depend on the availability of domain wall resonance modes. In this respect, pinned domain walls in magnetic nanowires are particularly attractive. In this geometry, spin wave confinement perpendicular to the nanowire axis produces a multitude of domain wall resonances enabling efficient spin wave emission at frequencies up to 100 GHz and wavelengths down to 20 nm. At high frequency, the emission of spin waves in magnetic nanowires becomes monochromatic. Moreover, pinning of magnetic domain wall oscillators onto the same ferroelectric domain boundary in parallel nanowires guarantees good coherency between spin wave sources, which opens perspectives towards the realization of Mach-Zehnder type logic devices and sensors.en
dc.description.versionPeer revieweden
dc.identifier.citationVan De Wiele , B , Hämälaïnen , S J , Baláz , P , Montoncello , F & Van Dijken , S 2016 , ' Tunable short-wavelength spin wave excitation from pinned magnetic domain walls ' , Scientific Reports , vol. 6 , 21330 , pp. 1-11 . https://doi.org/10.1038/srep21330en
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dc.relation.ispartofseriesSCIENTIFIC REPORTSen
dc.relation.ispartofseriesVolume 6en
dc.titleTunable short-wavelength spin wave excitation from pinned magnetic domain wallsen
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi