Thermally induced magnon accumulation in two-sublattice magnets

Two-magnon bound state causes ultrafast thermally induced magnetisation switching

There has been much interest recently in the discovery of thermally induced magnetisation switching using femtosecond laser excitation, where a ferrimagnetic system can be switched deterministically without an applied magnetic field. Experimental results suggest that the reversal occurs due to intrinsic material properties, but so far the microscopic mechanism responsible for reversal has not b...

Finite-temperature behavior of anisotropic two-sublattice magnets

Modeling spincaloric transport: Magnon accumulation and propagation

Contents Zusammenfassung i List of Figures ix List of Tables xiii 1 Introduction 1

Quenched Magnon excitations by oxygen sublattice reconstruction in (SrCuO2)n/(SrTiO3)2 superlattices

The recently discovered structural reconstruction in the cuprate superlattice (SrCuO2)n/(SrTiO3)2 has been investigated across the critical value of n = 5 using resonant inelastic x-ray scattering (RIXS). We find that at the critical value of n, the cuprate layer remains largely in the bulk-like two-dimensional structure with a minority of Cu plaquettes being reconstructed. The partial reconstr...

Two-step photo-induced phase transitions in a two-sublattice model

As an effective model for the two-step spin transition, we study a two-sublattice spin model that takes into account intra-site antiferromagnetic and inter-site ferromagnetic couplings. Due to the competition between these couplings, the temperature dependence of the high spin fraction shows a two-step transition. We perform Monte Carlo (MC) simulations including a photoexcitation term. The MC ...