Igor L. Maksimov

Thermal accumulation effect in three-dimensional recording by picosecond pulses

In-bulk recording without cracking in borosilicate glass by high repetition rate (80 MHz) 12 ps pulses at 355 nm wavelength is demonstrated and discussed. The theoretical model of a “hot-line” scan and thermal accumulation qualitatively well describes the experimental results. The analytical expression of a thermally induced stress was obtained.

Reconsideration of the concept of critical nucleus and the Gibbs—Thomson equation

The concept of critical nucleus is reconsidered by taking a single component system as an example and it is found that the size n K of a cluster for which the probabilities of decay and growth balance is not equal to the size n for which the reversible work of cluster formation takes its maximum value. n K is in general smaller than n* when n is treated as a continuous variable. There exist two values for n K , the larger of the two is kinetically unstable but the smaller is stable. The difference between the larger n K and n* increases but the difference between the two values of n K decreases with the degree of supersaturation or supercooling, and in the critical state the two values of n K coincide and it diminishes to 8/27 of n* for three-dimensional homogeneous nucleation and to 1/4 of n* for two-dimensional nucleation on a substrate. Beyond this critical state n K does not exist and for a cluster with any size the probability of growth is higher than that of decay. Whenever the Gibbs-Thomson equation is employed to take into account the curvature effect in describing kinetic processes such as in the BCF theory of spiral growth or in the studies of morphological instability, it must be replaced by the relation between the larger n K and the degree of supersaturation or supercooling.

Energy barrier effect on transient nucleation kinetics: Nucleation flux and lag-time calculation

Energy barrier effect on the transient nucleation kinetics is studied. For a high barrier case an advanced interpolation of the “boundary-layer” type is suggested that is valid for the entire time interval. The nucleation kinetics for the “nucleated cluster” size nc is described, the lag time estimate for n=nc is given. For a low barrier case a new “similarity” solution is reported. It is shown that analytical results provide an adequate description of the transient nucleation kinetics (in comparison with numerical solution of governing equation) for both high-barrier and low-barrier conditions.

Field-dependent critical current in type-II superconducting strips: Combined effect of bulk pinning and geometrical edge barrier

Recent theoretical and experimental research on low-bulk-pinning superconducting strips has revealed striking domelike magnetic-field distributions due to geometrical edge barriers. The observed magnetic-flux profiles differ strongly from those in strips in which bulk pinning is dominant. In this paper we theoretically describe the current and field distributions of a superconducting strip under the combined influence of both a geometrical edge barrier and bulk pinning at the strips critical current

On the Temkin model of solid–liquid interface

{I}_{c},

Theory of the kinetic critical nucleus in binary systems

where a longitudinal voltage first appears. We calculate

Transient kinetics of the runaway nucleation

{I}_{c}

Growth and dissolution kinetics of step structure

and find its dependence upon a perpendicular applied magnetic field

Thermal effects in three-dimensional recording by femto/nano-second pulses

{H}_{a}.

Temperature-Dependent Micro-Crack Propagation

The behavior is governed by a parameter p, defined as the ratio of the bulk-pinning critical current