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

Ben Van De Wiele, Sampo J. Hämälaïnen, Pavel Baláz, Federico Montoncello, Sebastiaan Van Dijken*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

42 Citations (Scopus)
173 Downloads (Pure)

Abstract

Miniaturization 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.

Original languageEnglish
Article number21330
Pages (from-to)1-11
JournalScientific Reports
Volume6
DOIs
Publication statusPublished - 17 Feb 2016
MoE publication typeA1 Journal article-refereed

Fingerprint Dive into the research topics of 'Tunable short-wavelength spin wave excitation from pinned magnetic domain walls'. Together they form a unique fingerprint.

Cite this