Long-Range Crystalline Nature of the Skyrmion Lattice in MnSi

Abstract

We report small angle neutron scattering of the Skyrmion lattice in MnSi using an experimental setup that minimizes the effects of demagnetizing fields and double scattering. Under these conditions, the Skyrmion lattice displays resolution-limited Gaussian rocking peaks that correspond to a magnetic correlation length in excess of several hundred micrometers. This is consistent with exceptionally well-defined long-range order. We further establish the existence of higher-order scattering, discriminating parasitic double scattering with Renninger scans. The field and temperature dependence of the higher-order scattering arises from an interference effect. It is characteristic for the long-range crystalline nature of the Skyrmion lattice as shown by simple mean-field calculations.

Complex magnetic phase diagram and skyrmion lifetime in an ultrathin film from atomistic simulations

“…1(a)-(b) by an increased number of skyrmions. [7,10,15,29,34,35,45] and earlier calculations [33,46]. At finite magnetic fields, there is always a peak at q = 0, reflecting the finite magnetization of the system.…”

Numerical studies on antiferromagnetic skyrmions in nanodisks by means of a new quantum simulation approach

“…About 30 years later, Bogdanov and Yablonskii theoretically predicted [2] that they could exist in magnets when a chiral DzyaloshinskyMoriya (DM) interaction [3][4][5] is present. Indeed, it was later found in experiments that magnetic skyrmions exist in helical magnets, such as MnSi and Fe 1−x Co x Si [6][7][8], and DM interaction favors canted spin configuration [6][7][8][9][10][11][12][13][14][15][16]. Most skyrmions found in helimagnets were induced by an external magnetic field at low temperatures [6][7][8]17].…”

Antiferromagnetic spin cantings as a driving force of ferroelectricity in multiferroic Cu2OSeO3

“…The equation (14) for the electric polarization is derived for the case of a spiral magnetic structure and contains the wavenumber k and the helix axis direction n. The helical twist, however, is not the only possible type of spin ordering, and, in particular, the A-phase in MnSi and Cu 2 OSeO 3 crystals possesses a complex magnetic structure with a double twist of the magnetization [37][38][39]. In general, an arbitrary field M(r) should be considered with a possible restriction concerning the constancy of its magnitude, M(r) = M 0 µ(r).…”