Berlin 2015 – scientific programme

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MA: Fachverband Magnetismus

MA 26: Focus: Towards quantitative magnetic measurements at ultimate spatial resolution with electrons

MA 26.2: Invited Talk

Wednesday, March 18, 2015, 10:00–10:30, EB 202

Observation and Manipulation of Magnetic Skyrmions — •Shinichiro Seki — RIKEN Center for Emergent Matter Science (CEMS), Wako, Japan

Magnetic skyrmion is a topologically stable particle-like object, which appears as nanometer-scale vortex-like spin texture in a chiral-lattice magnet. In metallic materials (MnSi, FeGe, Fe1-xCoxSi etc), conduction electrons moving through skyrmion spin texture gain a nontrivial quantum Berry phase, which provides topological force to the underlying spin texture and enables the current-induced manipulation of magnetic skyrmion. Recently, we newly discovered that skyrmions appear also in an insulating chiral-lattice magnet Cu2OSeO3. We find that the skyrmions in insulator can magnetically induce electric polarization through the relativistic spin-orbit interaction, which implies possible manipulation of the skyrmion by external electric field without loss of Joule heating. Such electric controllability, as well as the particle nature and nanometric size, highlights skyrmion as a promising candidate of potential information carrior for next generation of magnetic storage device with high energy efficiency. In this talk, we discuss the imaging of skyrmions with Lorentz transmission electron microscopy (LTEM) technique and their dynamical response under various external stimuli.