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Abstract
The relation between domain wall motion and intensity of driven current is examined in a phenomenological theory where the kinetic energy is expanded as a series of polynomial function of current density just as the Landau phase transition theory. The dependency of velocity on current density is square root which degenerates into linear if the current is much higher than the critical value. The theory result is consistent with several previous experiments and also can explain the change of critical current in the presence of temperature. The role of temperature playing in the dynamics of domain wall motion is also discussed. The phase transition theory in terms of current density is employed to explain the critical behavior of domain wall motion.
Highlights
The dynamics of domain wall (DW) motion in ferromagnetic materials and devices is essential and has been extensively studied since magnetic data storage technology emerged [1]
The relation between velocity of DW and density of current injected is crucial to DW motion dynamics in a so-called spin transfer torque effect [2] [3]
DW can be shifted by polarized electric current due to spin transfer torque [4]
Summary
The dynamics of domain wall (DW) motion in ferromagnetic materials and devices is essential and has been extensively studied since magnetic data storage technology emerged [1]. The relation between velocity of DW and density of current injected is crucial to DW motion dynamics in a so-called spin transfer torque effect [2] [3]. Efforts have been made in both theoretical and experimental research to explore the mechanism of domain wall motion induced by current [5]-[8].
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