Álvaro S. Núñez

Domain wall motion on magnetic nanotubes

In this paper the dynamical regimes of the motion of domain walls in magnetic nanotubes are studied theoretically. We compare results obtained with a simplified model of the magnetic energy with a detailed one that includes an exact treatment of the dipolar field. We demonstrate that the proper inclusion of dipolar effects changes qualitatively the mobility of a vortex domain wall driven by an applied magnetic field. We report that magnetic nanotubes display the characteristic phenomenology of domain wall motion: at low fields we find a steady motion with almost constant mobility (velocity/field) up to a critical field, where steady motion breaks out and a precessional motion appears. It is also found that the initial chirality of a vortex domain wall determines the dynamic regime of the motion near the Walker critical field.

Functional Keldysh theory of spin torques

We present a microscopic treatment of current-induced torques and thermal fluctuations in itinerant ferromagnets based on a functional formulation of the Keldysh formalism. We find that the nonequilibrium magnetization dynamics is governed by a stochastic Landau-Lifschitz-Gilbert equation with spin-transfer torques. We calculate the Gilbert damping parameter

Domain wall manipulation in magnetic nanotubes induced by electric current pulses

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Insights into the Mechanism of an SN2 Reaction from the Reaction Force and the Reaction Electronic Flux

and the nonadiabatic spin transfer torque parameter

Inelastic scattering in ferromagnetic and antiferromagnetic spin valves

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Topological spin waves in the atomic-scale magnetic skyrmion crystal

for a model ferromagnet. We find that

The mechanism of Menshutkin reaction in gas and solvent phases from the perspective of reaction electronic flux

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Colossal anisotropy in diluted magnetic topological insulators

, in agreement with the results obtained using imaginary-time methods of Kohno et al. [J. Phys. Soc. Jpn. 75, 113706 (2006)]. We comment on the relationship between

Dynamics and spontaneous coherence of magnons in ferromagnetic thin films

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Effective temperature and Gilbert damping of a current-driven localized spin

and isotropic-Stoner toy models of ferromagnetism and more realistic density-functional-theory models, and on the implications of these relationships for predictions of the