Texture fluctuations and emergent dynamics in coupled nanomagnets

Abstract

We report on the thermal fluctuations of magnetization textures in two stray field coupled elements, forming mesospins. The energy landscape associated with the thermal dynamics of the textures is mapped out and asymmetric energy barriers are identified. These barriers govern the switching of the edge magnetization, which can be modified by changing the gap separating the mesospins. Moreover, the coupling between the edges leads to an anisotropy in the curvature of the energy surface at the metastable minima. This yields a dynamic mode splitting of the edge modes and affects the attempt switching frequencies. Thus, we elucidate the mechanism with which the magnons in the thermal bath generate the stochastic fluctuations of the magnetization at the edges.