Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 48: Poster Session II

MA 48.19: Poster

Donnerstag, 10. März 2016, 15:00–18:00, Poster B1

Spin-current manipulation of photo-induced magnetization dynamics — •Steffen Wittrock¹, Dennis Meyer¹, Markus Müller¹, Henning Ulrichs¹, Jakob Walowski², Ulrike Martens², and Markus Münzenberg² — ¹Georg-August-Universität Göttingen — ²Ernst-Moritz-Arndt-Universität Greifswald

Spin currents offer a way to control static and dynamic magnetic properties, and therefore they are crucial for next-generation MRAM devices or spin- torque oscillators. Manipulating the dynamics is especially interesting within the context of photo-magnonics. In typical 3d transition metal ferromagnets like CoFeB, the lifetime of light-induced magnetization dynamics is restricted to about 1 ns, which e.g. strongly limits the opportunities to exploit the wave nature in a magnonic crystal filtering device. Here, we investigate the potential of spin-currents to increase the lifetime in a simple trilayer system, consisting of 8 nm β-Tantalum, 5 nm CoFeB, capped by 3 nm Ruthenium. The samples were grown in UHV by magnetron sputtering (Ta, CoFeB) and E-beam evaporation (Ru), and subsequently patterned into micron-sized conduction strips using E-beam-lithography. Due to the spin Hall effect, the Ta layer generates a transverse spin current when a lateral charge current passes through the strip. Using time-resolved all-optical pump-probe spectroscopy, we investigate how this spin current affects the magnetization dynamics in the adjacent CoFeB layer.