Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 54: Electron Theory of Magnetism and Micromagnetic Simulations

MA 54.6: Vortrag

Freitag, 11. März 2016, 11:30–11:45, H34

Chiral bobbers new type of stable particle like states in chiral magnets — Filipp N. Rybakov¹, Alexander B. Borisov¹, Stefan Blügel², and •Nikolai S. Kiselev² — ¹M. N. Miheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, Ekaterinburg 620990, Russia — ²Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, D-52425 Jülich, Germany

We present a recently discovered new type of a thermodynamically stable magnetic quasi-particle, which appears at interfaces, and surfaces of isotropic chiral magnets [1]. Because of the essential chirality of such a state and its localization close to the surface with the finite penetration depth, like a fishing bobber at a water surface, we use term chiral bobber (ChB) to refer to this object. The ChB is a soliton solution of micromagnetic equations localized in all three dimensions. It constitutes a new class of particles the hybrid particles composed of a smooth magnetization field and a magnetic singularity (Bloch point). Both contribute to three-dimensional torque fields and interesting dynamical and electron transport properties. Such new particle like state exhibits high thermal stability and thereby can be considered as promising object for fundamental research and practical applications in spintronic devices. We provide arguments that such a state can be found in different Si or Ge based B20-type alloys.

[1] F.N. Rybakov, A.B. Borisov, S. Blügel, & N.S.Kiselev, New type of stable particle like states in chiral magnets. Phys. Rev. Lett. 115, 117201 (2015).