EXPERIMENTAL OBSERVATION OF CHIRAL MAGNETIC BOBBERS AND NEW CONCEPT FOR MAGNETIC SOLID-STATE MEMORY
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)).
References
- Zheng F., Rybakov F.N., and Borisov A.B. Experimental observation of chiral magnetic bobbers in B20-type FeGe. Nature Nanotechnology, 2018, Vol. 13, р. 451–455.
- Rybakov F.N., Borisov A.B., Blügel S., and Kiselev N.S. New type of particlelike state in chiral magnets, Phys. Rev. Lett., 2015, Vol. 115, pp. 117201.
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