Abstract
Chiral magnetic skyrmions are nanoscale vortex-like spin textures that form in the presence of an applied magnetic field in ferromagnets that support the DzyaloshinskiiMoriya interaction (DMI) because of strong spin-orbit coupling and broken inversion symmetry of the crystal. Recently, a new type of localized particle-like object – the chiral bobber (ChB) – was predicted theoretically (Rybakov et al., 2015) in such materials. Here, we report the direct observation of ChBs (Zheng et al., 2018) in thin films of B20-type FeGe by means of quantitative off-axis electron holography. Furthermore, we show that ChBs are able to coexist with skyrmions over a wide range of parameters, which suggests their possible practical applications in novel magnetic solid-state memory devices, in which a stream of binary data bits can be encoded by a sequence of skyrmions and bobbers. Work was performed within the state task of FANO Russia (subject “Quantum,” No. g.r. 01201463332) (АААА-А18-118020190095-4)).
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