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Spin waves are perturbations in the relative orientation of magnetic momentsin a continuous magnetic system, which have been proposed as a new kind ofinformation carrier for spin-based low power applications. For this purpose, amajor obstacle to overcome is the energy-efficient excitation of coherent shortwavelength spin waves and alternatives to excitation via the Oersted field ofan alternating current need to be explored. Here we show, by means ofmicromagnetic simulations, how, in a perpendicularly magnetized thin strip, adomain wall pinned at a geometrical constriction emits spin waves when forcedto rotate by the application of a low direct current flowing along the strip.Spin waves propagate only in the direction of the electron's flow at the firstodd harmonic of the domain wall rotation frequency for which propagation isallowed. Excitation is due to in-plane dipolar stray field of the rotatingdomain wall and that the resulting unidirectionality is a consequence of thedomain wall displacement at the constriction. On the other hand, theapplication of an external field opposing domain wall depinning breaks thesymmetry for spin wave propagation in the two domains, allowing emission inboth directions but at different frequencies. The results presented define anew approach to produce tunable high frequency spin wave emitters of easyfabrication and low power consumption.

Pinned domain wall oscillator as tunable direct current spin wave emitter