Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 64: Poster 1
MA 64.66: Poster
Freitag, 24. März 2017, 09:30–13:00, P2-EG
Ultrafast demagnetization dynamics in non-collinear magnetic multilayers — •Sakshath Sadashivaiah1, Martin Steihl1, Fabian Ganss2,3, David Schummer1, Moritz Barkowski1, Ute Bierbrauer1, Manfred Albrecht3, Mirko Cinchetti4, Benjamin Stadtmueller1, Stefan Mathias5, and Martin Aeschlimann1 — 1T U Kaiserslautern, Erwin-Schroedinger-Strasse 46, 67663 Kaiserslautern, Germany — 2T U Chemnitz, 09107 Chemnitz, Germany — 3University of Augsburg, Universitätsstraße 1 Nord, 86159 Chemnitz, Germany — 4T U Dortmund, 44221 Dortmund, Germany — 5University of Göttingen, Friedrich Hund Platz 1, 37077 Göttingen, Germany
Non-collinear magnetic multilayers are ideal sample systems to study optically excited spin currents in magnetic materials. Our sample system consists of two magnetic layers, a Pd/Co multilayer layer films and a NiFe alloy, separated by a non-magnetic spacer layer. Using an external magnetic field, the relative magnetization direction of both magnetic layers can be tuned from non-collinear or to collinear. Optical excitation of the NiFe layer by fs laser pluses creates spin currents that are injected into the subsequent layers. Using the complex nature of the Kerr response [1], we study the magnetization dynamics of individual layers. This allows us to determine the role of ultrafast spin currents for the fs-demagnetization in the collinear and non-collinear configurations, as well as for different spacer materials.
References: J. Hamrle et al, Phys. Rev. B 66, 224423 (2002)