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Optical tools are of great promise for generation of spin waves due to thepossibility to manipulate on ultrashort time scales and to provide localexcitation. However, a single laser pulse can inject spin waves only with abroad frequency spectrum, resulting in a short propagation distance and lowamplitude. Here we excite a magnetic garnet film by a train of fs-laser pulseswith 1 GHz repetition rate so that pulse separation is smaller than decay timeof the magnetic modes which allows to achieve collective photonic impact onmagnetization. It establishes a quasi-stationary source of SWs, namely acoherent magnon accumulation ("magnon cloud"). This approach has severalappealing features: (i) the source is tunable; (ii) the SW amplitude can besignificantly enhanced; (iii) the spectrum of the generated SWs is quite narrowthat provides longer propagation distance; (iv) the periodic pumping results inalmost constant in time SW amplitude up to 100 um away from the source; and (v)the SW emission shows a pronounced directionality. These results expand thecapabilities of ultrafast coherent optical control of magnetization and pave away for applications in data processing, including the quantum regime. Thequasi-stationary magnon accumulation might be also of interest for the problemof magnon Bose-Einstein condensate.

Excitation of magnon accumulation by laser clocking as a source of long-range spin waves in transparent magnetic films