Hysteretic memory effects in disordered magnets

Multiscale modeling of hysteretic phenomena in magnets â•ž(invited)

8 SCIENTIFIC HIGHLIGHT OF THE MONTH: ”Relativistic Effects and Disordered Local Moments in Magnets” Relativistic Effects and Disordered Local Moments in Magnets

A brief review of the ‘disordered local moment’ (DLM) theory of magnetism at finite temperatures is given. This has recently been enhanced so that it includes relativistic (R) effects such as spin-orbit coupling. The relevance of the R-DLM theory for providing an ab-initio account of the temperature dependence of magnetic properties including magnetotransport is stressed. Magnetic anisotropy is...

Bose-glass phases in disordered quantum magnets.

In disordered spin systems with antiferromagnetic Heisenberg exchange, transitions into and out of a magnetic-field-induced ordered phase pass through unique regimes. Using quantum Monte Carlo simulations to study the zero-temperature behavior, these intermediate regions are determined to be Bose-glass phases. The localization of field-induced triplons causes a finite compressibility and, hence...

Spin-wave localization in disordered magnets

The propagation of spin waves [1] is in the focus of modern research because of its importance for spin caloritronic applications [2–6], and for future information processing devices which might either rely on magnonic [7] instead of electronic transport or combine electronic with magnonic transport. The dynamics of spin waves is mostly described by the Landau-Lifshitz-Gilbert equation, a nonli...

Multiscale nature of hysteretic phenomena: Application to CoPt-type magnets