Direct observation of attractive skyrmions and skyrmion clusters in the cubic helimagnet Cu2OSeO3 - Physical Review B 97, 134403 (2018).

We have published a paper in Physical Review B.

J. C. Loudon, A. O. Leonov, A. N. Bogdanov, M. C. Hatnean, G. Balakrishnan, Direct observation of attractive skyrmions and skyrmion clusters in the cubic helimagnet Cu2OSeO3, Physical Review B 97, 134403 (2018).

https://doi.org/10.1103/PhysRevB.97.134403

Abstract

We report the discovery of attractive magnetic skyrmions and their clusters in noncentrosymmetric ferromagnets. These three-dimensional solitons have been predicted to exist in the cone phase of chiral ferromagnets [J. Phys: Condens. Matter 28, 35LT01 (2016)] and are fundamentally different from the more common repulsive axisymmetric skyrmions that occur in the magnetically saturated state. We present real-space images of these skyrmion clusters in thin (∼70 nm) single-crystal samples of Cu2OSeO3 taken using transmission electron microscopy and develop a phenomenological theory describing this type of skyrmion.