Ultrafast relaxation rates and reversal time in disordered ferrimagnets

Ultra-fast relaxation rates and reversal time in disordered ferrimagnets

O.J. Suarez1,2, P. Nieves, D. Laroze1,4, D. Altbir, and O. Chubykalo-Fesenko 1 Instituto de Alta Investigación, Universidad de Tarapacá, Casilla 7D, Arica, Chile 2 Departamento de Matemáticas y Fı́sica, Universidad de Sucre, A.A. 406, Sincelejo, Colombia Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco, 28049 Madrid, Spain 4 SUPA School of Physics and Astronomy, University of Glas...

Green function retrieval and time reversal in a disordered world.

We apply the theory of multiple wave scattering to two contemporary, related topics: imaging with diffuse correlations and stability of the time reversal of diffuse waves, using equipartition, coherent backscattering, and frequency speckles as fundamental concepts.

Supersymmetric Virial Expansion for Time-Reversal Invariant Disordered Systems

Abstract. We develop a supersymmetric virial expansion for two point correlation functions of almost diagonal Gaussian Random Matrix Ensembles (ADRMT) of the orthogonal symmetry. These ensembles have multiple applications in physics and can be used to study universal properties of time-reversal invariant disordered systems which are either insulators or close to the Anderson localization transi...

Minimum Field Strength in Ultrafast Magnetization Reversal

Ageing and relaxation times in disordered insulators

We focus on the slow relaxations observed in the conductance of disordered insulators at low temperature (especially granular aluminum films). They manifest themselves as a temporal logarithmic decrease of the conductance after a quench from high temperatures and the concomitant appearance of a field effect anomaly centered on the gate voltage maintained. We are first interested in ageing effec...