Time-resolved x-ray microscopy of spin-torque-induced magnetic vortex gyration |
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Authors: | Bolte Markus Meier Guido Krüger Benjamin Drews André Eiselt René Bocklage Lars Bohlens Stellan Tyliszczak Tolek Vansteenkiste Arne Van Waeyenberge Bartel Chou Kang Wei Puzic Aleksandar Stoll Hermann |
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Institution: | Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Universit?t Hamburg, Jungiusstrasse 11, 20355 Hamburg, Germany. mbolte@physik.uni-hamburg.de |
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Abstract: | Time-resolved x-ray microscopy is used to image the influence of alternating high-density currents on the magnetization dynamics of ferromagnetic vortices. Spin-torque-induced vortex gyration is observed in micrometer-sized permalloy squares. The phases of the gyration in structures with different chirality are compared to an analytical model and micromagnetic simulations, considering both alternating spin-polarized currents and the current's Oersted field. In our case the driving force due to spin-transfer torque is about 70% of the total excitation while the remainder originates from the current's Oersted field. This finding has implications to magnetic storage devices using spin-torque driven magnetization switching and domain-wall motion. |
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