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Full-Text Articles in Physics
Seedlayer And Preheating Effects On Crystallography And Recording Performance Of Cocrptb Perpendicular Media, Min Zheng, Geon Choe, Kenneth E. Johnson, Lan Gao, Sy_Hwang Liou
Seedlayer And Preheating Effects On Crystallography And Recording Performance Of Cocrptb Perpendicular Media, Min Zheng, Geon Choe, Kenneth E. Johnson, Lan Gao, Sy_Hwang Liou
Department of Physics and Astronomy: Faculty Publications
The effects of seedlayer (SL) and preheating on the crystallographic, magnetic, and recording properties of CoCr18Pt16B4 granular perpendicular magnetic media have been investigated. For the media with Ru as underlayer, although higher preheating improves both coercivity and squareness, the media is much noisier. With introducing Ta SL, Ru (0002)/Co (0002) crystallography is greatly enhanced. High coercivity, unity squareness, and negative nucleation field are achieved even at low preheating without degrading signal-to-noise ratio. In addition, the media is magnetically stable for a wide range of recording density.
Threshold-Related Effects In High-Order Harmonic Generation, Bogdan Borca, Anthony F. Starace, A. V. Flegel, M. V. Frolov, N. L. Manakov
Threshold-Related Effects In High-Order Harmonic Generation, Bogdan Borca, Anthony F. Starace, A. V. Flegel, M. V. Frolov, N. L. Manakov
Department of Physics and Astronomy: Faculty Publications
We present exact ab initio quantum results for harmonic generation (HG) by a weakly bound electron interacting with a strong monochromatic laser field. The analytic structure of the HG amplitude resulting from the multiphoton detachment thresholds is demonstrated. Our numerical results show that the HG spectrum is sensitive primarily to the distance in energy from the thresholds, thereby opening new possibilities for control of HG.
Multielectron System In An Ultrashort, Intense Laser Field: A Nonperturbative, Time-Dependent Two-Active-Electron Approach, G. Lagmago Kamta, Anthony F. Starace
Multielectron System In An Ultrashort, Intense Laser Field: A Nonperturbative, Time-Dependent Two-Active-Electron Approach, G. Lagmago Kamta, Anthony F. Starace
Department of Physics and Astronomy: Faculty Publications
We present a two-active-electron (TAE) approach for solving the time-dependent Schrödinger equation (TDSE) for the interaction of a multi-electron system with an ultrashort, intense, and linearly polarized laser pulse [Lagmago Kamta and Starace, Phys. Rev. Lett. 86, 5687 (2001)]. A technique for obtaining angular distributions for double ionization by such pulses is also described. The approach for solving the TDSE in the TAE approximation is full dimensional and accounts for correlations between the two electrons, as well as the polarization of the core. It is based on a configuration-interaction expansion of the time-dependent wave function in terms of one-electron …
Electrons, Stern–Gerlach Magnets, And Quantum Mechanical Propagation, Herman Batelaan
Electrons, Stern–Gerlach Magnets, And Quantum Mechanical Propagation, Herman Batelaan
Department of Physics and Astronomy: Faculty Publications
Quantum corrections to Newton’s equations are obtained and used to illustrate that classical dynamics is embedded explicitly in quantum dynamics. Originally, the resultant set of dynamical equations has been used to shed light on quantum chaos. We show that the method can provide insight into the dynamics of free particles and the harmonic oscillator. We then use it to determine whether Stern–Gerlach magnets can be constructed for free electrons.
Phase And Absorption Gratings For Electrons, Hong Gao, Glen Gronniger, Daniel Friemund, Alex Cronin
Phase And Absorption Gratings For Electrons, Hong Gao, Glen Gronniger, Daniel Friemund, Alex Cronin
Department of Physics and Astronomy: Faculty Publications
We report the experimental realization of phase and absorption gratings for electrons. Phase gratings made with standing waves of light with a periodicity of 266 nm are used to diffract 380 eV electrons [1]. Material gratings of 100 and 200 nm periodicity are used to diffract 500 eV electrons. We are exploring the possibility to use these gratings for low energy electron interferometry.