Thermally activated helicity reversals of skyrmions

Thermally activated helicity reversals of skyrmions.
X. Z. Yu, K. Shibata, W. Koshibae, Y. Tokunaga, Y. Kaneko, T. Nagai, K. Kimoto, Y. Taguchi, N. Nagaosa, and Y. Tokura
Phys. Rev. B 93, 134417 (2016)

Schematic of a bubble with winding number 1. Arrows show that the magnetic moments and concentric rings are a bubble domain wall. ϕ, φ, and ψ denote the polar angle, azimuthal angle, and the angle between the magnetic moment and the $x$ direction, respectively.

Antiferromagnetic Skyrmions: Applied Current and Temperature

Static and Dynamical Properties of Antiferromagnetic Skyrmions in the Presence of Applied Current and Temperature.
Joseph Barker and Oleg A. Tretiakov
Phys. Rev. Lett. 116, 147203 (2016)

The spin texture of a $G$-type AFM Skyrmion. (a) Top view of the Skyrmion, white lines show contours of constant $n_z$. The radius is 2.1 nm. (b) Cross section of the Skyrmion. The core is not a single spin but a compensated structure combining the two sublattices.

Thernal Stability of Circular Nanomagnets

Thermal Stability of Magnetic States in Circular Thin-Film Nanomagnets with Large Perpendicular Magnetic Anisotropy.

Gabriel D. Chaves-O’Flynn, Georg Wolf, Jonathan Z. Sun, and Andrew D. Kent

Phys. Rev. Applied 4, 024010 (2015)

Energy barriers normalized to U0 calculated by the domain-wall model Eq. (14) (dashed lines) and obtained with the string method (solid points) for different applied fields and disk diameters. The black solid line corresponds to the macrospin model without applied field.

Topological and thermodynamic stabilityskyrmion lattice

Interplay between topological and thermodynamic stability in a metastable magnetic skyrmion lattice.

Hiroshi Oike, Akiko Kikkawa, Naoya Kanazawa, Yasujiro Taguchi, Masashi Kawasaki, Yoshinori Tokura & Fumitaka Kagawa

Nature Physics 12, 62 (2016)

Creation and annihilation of the metastable skyrmion lattice through thermal control.

Switching of exchange coupled grains

Thermally activated switching at long time scales in exchange-coupled magnetic grains.

Ahmad M. Almudallal, J. I. Mercer, J. P. Whitehead, M. L. Plumer, J. van Ek, and T. J. Fal

Phys. Rev. B 92, 134418 (2015)

The contour plot of the minimum energy surface for the weak coupling case I=0.5×10−3J/m2 for (a) H=0 and (b) H=4kOe. The black lines indicate the boundary separating each pair of basins of attraction {Ωα,Ωβ} and is denoted by Γαβ. The red lines indicate the MEP connecting the four minima. The lines cross at the saddle points sαβ.