Domain Wall Expansion

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.

Domain wall expansion. A brief formulation for the kinetic motion of domain wall is given when ferroelectric is put in external electrical field. The well known idea to construct domain wall type solutions of field equations by means of an expansion in the width of the domain wall is re examined. The basic problem is that an expansion of the thermodynamic.

The stripe domain structure in these films changes the structure of the boundary between the reversed and unreversed regions which may have an important effect on the velocity of boundary expansion. Hysteresis loop and polarization. Expansion in the width and collective dynamics of a domain wall h.

It been recently reported that field driven creep regime bubble domain expansion thin films that exhibit dmi is asymmetric under the application of an in plane field which can be used to quantify the dmi effective field in the domain wall dw. This suggests that the domain wall can radiate. For a simple periodic domain structure the width of domains and domain walls and polarization in walls is calculated.

The asymmetric expansion has been attributed to both chiral energy and chiral damping effects. Accepted 18 july 1997 abstract we show that collective dynamics of a curved domain wall in a 3 1 dimensional relativistic scalar field model is represented by a nambu goto membrane and 2 1 dimensional scalar fields defined on the world sheet of the membrane. We observe that the problem involves singular perturbations.

However research on domain wall motion has mostly concentrated on ultrathin films without a stripe domain structure during magnetization reversal and systematic investigations on the effect of stripe domain structure on boundary expansion and magnetization reversal are lacking. Hilbert chapman enskog method is used to construct the consistent perturbative expansion. We obtain the solutions to the second order in the width without introducing an effective.

Arodi 1 institute of physics jagellonian university reymonta 4 30 059 cracow poland received 26 march 1997. It turns out to be di erent from equations obtained in the e ective action approaches. The radiation was also observed in computer simulations 12.