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2 Jan 1989

Volume 54, Issue 1, pp. 1-85

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Narrow tracks in YBa2Cu3O7 thin films defined by laser ablation

R. G. Humphreys, J. S. Satchell, N. G. Chew, and J. A. Edwards

Appl. Phys. Lett. 54, 75 (1989); http://dx.doi.org/10.1063/1.101438 (3 pages) | Cited 9 times

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The use of cw laser ablation for defining narrow tracks in YBa2Cu3O7 thin films on (001) SrTiO3 substrates is described. Critical current densities have been observed up to 5×105 A/cm2 in 4‐μm‐wide tracks at 77 K. For these films, it is found that the value of critical current density calculated is insensitive to the length of track and the voltage criterion used.
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74.70.-b Superconducting materials other than cuprates
74.78.-w Superconducting films and low-dimensional structures
74.25.Sv Critical currents
81.05.Je Ceramics and refractories (including borides, carbides, hydrides, nitrides, oxides, and silicides)
81.65.-b Surface treatments

Magnetization and domain structure of cylinders and spheres in subsaturating fields

P. Bryant and H. Suhl

Appl. Phys. Lett. 54, 78 (1989); http://dx.doi.org/10.1063/1.100838 (3 pages) | Cited 7 times

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We explore the magnetization patterns and domain walls which may occur in ferromagnetic cylinders and spheres in a certain range of sizes, placed in a uniform external magnetic field below saturation. The solutions found are field‐free inside the sample. The analysis is explicitly carried out for circular and elliptic cylinders and spheres, and may be extended to general ellipsoids.
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75.60.Ch Domain walls and domain structure
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.30.Cr Saturation moments and magnetic susceptibilities

Insight into the dynamics of trimethylaluminum photolysis

G. S. Higashi and M. L. Steigerwald

Appl. Phys. Lett. 54, 81 (1989); http://dx.doi.org/10.1063/1.100840 (3 pages) | Cited 5 times

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Ab initio methods (Hartree–Fock, generalized valence bond, and configuration interaction) have been used to characterize the electronic states of molecular analogs to trimethylaluminum. An understanding of the mechanism of photoexcitation and subsequent dissociation emerges as the calculations reveal that optical excitation results in a metastable bound state rather than a directly dissociative state. The substantial excess energy associated with the transition is stored in electronic and vibrational degrees of freedom other than those associated with the dissociation coordinate. This interpretation allows a large body of observations to be simply understood and has implications for the implementation of the technology of laser photolysis for thin‐film deposition.
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82.50.Bc Processes caused by infrared radiation
82.50.Hp Processes caused by visible and UV light
82.65.+r Surface and interface chemistry; heterogeneous catalysis at surfaces
81.15.Gh Chemical vapor deposition (including plasma-enhanced CVD, MOCVD, ALD, etc.)
31.15.V- Electron correlation calculations for atoms, ions and molecules

Oscillator strength of ruby R1 line under high pressure

Surinder M. Sharma and Y. M. Gupta

Appl. Phys. Lett. 54, 84 (1989); http://dx.doi.org/10.1063/1.100841 (2 pages) | Cited 11 times

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A recently observed rapid decrease in oscillator strength of 2E(math)→4A2 (R1 line) of ruby with static pressure is quantitatively explained with the help of other observed spectral shifts and a scaling procedure used earlier to model wavelength shifts with pressure. Oscillator strength is also predicted to decrease for R′ lines, but for B lines it increases with pressure.
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71.70.Ch Crystal and ligand fields
33.70.Ca Oscillator and band strengths, lifetimes, transition moments, and Franck-Condon factors
78.20.-e Optical properties of bulk materials and thin films
78.55.Hx Other solid inorganic materials
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