Bi-stability of magnetic skyrmions in ultrathin multilayer nanodots induced by magnetostatic interaction

Abstract

We report the results of simulations of magnetic skyrmion stability in ultrathin magnetic multilayer nanodots with interfacial Dzyaloshinskii-Moriya exchange interaction (DMI). We found that in presence of the lateral confinement the magnetostatic energy significantly influences the skyrmion stability and leads to stabilization of large radius skyrmion even at low values of the DMI strength, in addition to small radius skyrmion stabilized by DMI. In particular, stabilization of the skyrmion state with two different radii (bi-stability) is found in dipolarly-coupled (Pt/Co/Ir)${}_n$ circular nanodots with the number of repeats of the unit cell $n$ = 3 and 5. The bi-stability range is located at the DMI strength of 0.9-1.1 mJ/m${}^2$ or at the total Co-layer thickness of 2.2-2.6 nm.

References in corpus (5)

• Advances in the Physics of Magnetic Skyrmions and Perspective for Technology
• Additive interfacial chiral interaction in multilayers for stabilization of small individual skyrmion at room temperature
• Spin-Wave Spectrum in Magnetic Nanodot with Continuous Transition between Vortex, Bloch-type Skyrmion and Néel-type Skyrmion States
• Field-Driven Evolution of Chiral Spin Textures in Thin Nanodisk of the Helimagnets
• Stability of Neel skyrmions in ultra-thin nanodots considering Dzyaloshinskii-Moriya and dipolar interactions

Cited by in corpus (1)

• Formation of Néel Type Skyrmions in an Antidot Lattice with Perpendicular Magnetic Anisotropy