Do Images of Biskyrmions Show Type-II Bubbles?
Twitchett-Harrison, Alison C
Birch, Max T
Turnbull, Luke A
Ogrin, Feodor Y
Hatton, Peter D
Advanced materials (Deerfield Beach, Fla.)
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Loudon, J., Twitchett-Harrison, A. C., Cortés-Ortuño, D., Birch, M. T., Turnbull, L. A., Štefančič, A., Ogrin, F. Y., et al. (2019). Do Images of Biskyrmions Show Type-II Bubbles?. Advanced materials (Deerfield Beach, Fla.), 31 (16), e1806598. https://doi.org/10.1002/adma.201806598
The intense research effort investigating magnetic skyrmions and their ap- plications for spintronics has yielded reports of more exotic objects including the biskyrmion, which consists of a bound pair of counter-rotating vortices of magnetization. Biskyrmions have been identified only from transmission elec- tron micrographs and have not been observed by other techniques, nor seen in simulations carried out under realistic conditions. Here we combine quantita- tive Lorentz transmission electron microscopy (LTEM), x-ray holography and micromagnetic simulations to search for biskyrmions in MnNiGa, a material in which they have been reported. We find only type-I and type-II magnetic bubbles and demonstrate that images purported to show biskyrmions can be explained as type-II bubbles viewed at an angle to their axes. It is not the mag- netization but the magnetic flux density resulting from this object that forms the counter-rotating vortices.
EPSRC (via Durham University) (RF040462)
External DOI: https://doi.org/10.1002/adma.201806598
This record's URL: https://www.repository.cam.ac.uk/handle/1810/289411