178 research outputs found
A slope-theory approach to electrical probe recording on phase-change media
Copyright © 2005 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Journal of Applied Physics 97 (2005) and may be found at http://link.aip.org/link/?JAPIAU/97/103537/1notes: The first paper to address theoretically the issue of writing resolution in electrical probe recording on phase-change media. The theory combined the thermal, kinetic, and electronic properties of the storage medium in an analytical framework to predict the ultimate writing resolutions of this technology. The theory also provided directions in material selection and design to increase the resolution and hence storage density of this new technology. The work led to invited presentations at on probe-based storage at the IEEE/IoP Magnetics Society Wohlfarth Lecture Meeting, London, April 2005 and at the Seagate Research Conclave, June 2007 at Sprintown, Northern Ireland.A theoretical approach to predicting the spatial extent of the amorphous to crystalline transition region during the probe recording process on phase-change storage media is presented. The extent of this transition region determines the ultimate achievable linear density for data storage using phase-change materials. The approach has parallels with the slope theory used to find magnetic transition lengths in magnetic recording, and shows that the amorphous to crystalline transition length can be minimized by reducing the thickness of the phase-change layer, by minimizing lateral heat flow, and by maximizing the ratio of the activation energy for crystallization to the transition temperature Ec/Tt
The Influence of Strong Interaction on the Pionium Wave Functions at Small Distances
The influence of strong interaction of the behaviour of pionium
nS-state wave functions at small distance are investigated both analytically
(perturbatively) and so numerically. It is shown that in the whole the
accounting of strong interaction results in multiplying of pure Coulomb pionium
wave functions by some function practically independent on value of principal
quantum number n. Due to this reason the n-independence of probability of
atom production in nS-state remains the same as in case of pure
Coulomb interactionComment: 4 pages, 2 figure
The Influence of Strong Interaction on the Pionium Wave Functions at Small Distances
The influence of strong interaction of the behaviour of pionium nS-state wave functions at small distance are investigated both analytically (perturbatively) and so numerically. It is shown that in the whole the accounting of strong interaction results in multiplying of pure Coulomb pionium wave functions by some function practically independent on value of principal quantum number n. Due to this reason the n-independence of probability of Coulomb interactio
Enhancement and suppression of tunneling by controlling symmetries of a potential barrier
We present a class of 2D systems which shows a counterintuitive property that
contradicts a semi classical intuition: A 2D quantum particle "prefers"
tunneling through a barrier rather than traveling above it. Viewing the one
particle 2D system as the system of two 1D particles, it is demonstrated that
this effect occurs due to a specific symmetry of the barrier that forces
excitations of the interparticle degree of freedom that, in turn, leads to the
appearance of an effective potential barrier even though there is no "real"
barrier. This phenomenon cannot exist in 1D.Comment: 10 pages and 7 figure
Quantum Hall Effect induced by electron-electron interaction in disordered GaAs layers with 3D spectrum
It is shown that the observed Quantum Hall Effect in epitaxial layers of
heavily doped n-type GaAs with thickness (50-140 nm) larger the mean free path
of the conduction electrons (15-30 nm) and, therefore, with a three-dimensional
single-particle spectrum is induced by the electron-electron interaction. The
Hall resistance R_xy of the thinnest sample reveals a wide plateau at small
activation energy E_a=0.4 K found in the temperature dependence of the
transverse resistance R_xx. The different minima in the transverse conductance
G_xx of the different samples show a universal temperature dependence
(logarithmic in a large range of rescaled temperatures T/T_0) which is
reminiscent of electron-electron-interaction effects in coherent diffusive
transport.Comment: 6 pages, 3 figures, 1 tabl
Contribution of -terms to the total interaction cross sections of relativistic elementary atoms with atoms of matter
It is shown that the corrections of order to the total cross
sections for interaction of elementary hydrogen-like atoms with target atoms,
reported in the previously published paper [S.Mrowczynski, Phys.Rev. D36, 1520
(1987)], do not include some terms of the same order of magnitude. That results
in a significant contribution of these corrections in particular cases. The
full -corrections have been derived and it is shown that they are
really small and could be omitted for most practical applications.Comment: 5 page
The Relativistic Linear Singular Oscillator
Exactly-solvable model of the linear singular oscillator in the relativistic
configurational space is considered. We have found wavefunctions and energy
spectrum for the model under study. It is shown that they have correct
non-relativistic limits.Comment: 14 pages, 12 figures in eps format, IOP style LaTeX file (revised
taking into account referees suggestions
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