Dear Colleagues,

Spin dynamics determines the principal properties of magnetic materials which give rise to numerous applications. In this Special Issue, we welcome papers and reviews on all topics concerning spin dynamics, including spin transport, spin waves, spin–orbit coupling, and phase transition.

The first topic of this Special Issue is the study of the behavior of resistivity due to the motion of spins. This is one of the fundamental tasks in materials science at present. This is because transport properties occupy the first place in electronic devices and applications. The motion of a spin depends on its orientation with respect to lattice spin orientations. The well-known CMR (colossal magneto-resistance) is an example of spin transport. Other hot subjects which study spin resistivity for applications are spin–orbit torques, and the spin Hall effect. Spin resistivity has been investigated intensively both experimentally and theoretically for more than five decades. The rapid development of the field is due mainly to the many applications in spintronics. Experiments have been performed in many magnetic materials, including metals, semiconductors, and superconductors. One interesting aspect of magnetic materials is the existence of a magnetic phase transition from a magnetically ordered phase to the paramagnetic (disordered) state which drastically modifies resistivity. As for theories, many investigations have been carried out, but much is still unknown. Monte Carlo (MC) simulations have also been performed to study spin resistivity. Other systems in which the motion of a spin depends on the lattice geometry, the applied magnetic and electric fields, such as spin Hall, etc. are also under intensive investigations.

Another topic is spin waves in magnetic materials. Much research has been conducted on ferromagnets and antiferromagnets where spin configurations are collinear. However, new materials show that non-collinear spin states such as topological spin structures (skyrmions) due to competing interactions have more potential applications in spintronics. For these structures, it seems that no study of spin waves has been carried out so far.

Phase transitions including dynamic phase transitions and quantum phase transitions are also hot topics in frustrated spin systems. While the critical properties of phase transitions in non-frustrated collinear magnets have been well understood, phase transitions in non-collinear spin structures including skyrmions remain desirable.

The purpose of this Special Issue is to provide a collection of reviews and original papers on various phenomena due to spin dynamics. We have mentioned just a few of these above. We welcome original research papers, reviews, and surveys on rapidly developed theoretical, numerical, or experimental domains.

Prof. Dr. Hung T. Diep
Guest Editor

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• spin resistivity in magnetically ordered systems
• colossal magneto-resistance
• spin–orbit torques
• spin Hall conductivity
• anomalous Hall resistivity
• Monte Carlo simulations of spin resistivity
• experiments on spin resistivity
• theories on spin resistivity
• any subject treating spin motion in materials