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MA: Fachverband Magnetismus
MA 53: Skyrmions IV
MA 53.4: Talk
Friday, March 22, 2024, 10:15–10:30, EB 301
Current induced nucleation of spin textures in aperiodic multilayers — Riccardo Battistelli1,2, Kai Litzius2, Matthieu Grelier3, •Krishnanjana Puzhekadavil Joy1,2, Michael Schneider4, Christian M Günther5, Kathinka Gerlinger4, Christopher Klose4, Daniel Metternich1,2, Lisa Marie Kern4, Manas Ranjan Patra1,2, Tamer Karaman1,2, Josefin Fuchs4, Sascha Petz1, Stefan Eisebitt4,5, Bastian Pfau4, Nicolas Reyren3,6, Vincent Cros3, and Felix Büttner1,2 — 1Helmholtz Zentrum Berlin, Germany — 2University of Augsburg, Germany — 3Unité Mixte de Physique, CNRS-Thales, Palaiseau, France. — 4Max Born Institute,Berlin,Germany — 5Technische Universität Berlin, Germany — 6SOLEIL Synchrotron, Gif-sur-Yvette Cedex, France
Magnetic cocoons are ellipsoid-shaped 3D structures, that have been recently observed in aperiodic multilayers where magnetic interactions are varied along the thickness. Here we report the feasibility of the production of these cocoons using nanosecond current pulses in Pt/Co/Al aperiodic multilayer system. The images obtained using Scanning Transmission X-ray Microscopy also show other complex spin textures when stronger pulses are applied. Simulations show that these current pulses heat up the system. It also creates an Oersted field in addition to the applied magnetic field.The magnetic field-temperature phase diagram can be thus obtained from such images. The measurements lead to the conclusion that the magnetic field and temperature aid the system to a fluctuation state where the cocoons are nucleated.
Keywords: Three dimensional spin textures; Spin orbit torque; Dipolar interactions; Scanning Transmission X ray Microscopy; Skyrmionic cocoons