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14 Jul 2003

Volume 83, Issue 2, pp. 207-403

Issue Cover Spotlight Figure

Appl. Phys. Lett. 83, 225 (2003); http://dx.doi.org/10.1063/1.1591241 (3 pages)

A. Borowiec, D. M. Bruce, Daniel T. Cassidy, and H. K. Haugen
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Method based on polarized infrared spectroscopy for the determination of the spatial orientation of transition dipole moments of a ferroelectric liquid crystal

Jinggang Zhao and Yukihiro Ozaki

Appl. Phys. Lett. 83, 389 (2003); http://dx.doi.org/10.1063/1.1586991 (3 pages) | Cited 1 time

Online Publication Date: 8 July 2003

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A method to determine the spatial orientation of the transition dipole moments for ferroelectric liquid-crystal (FLC) molecules in the surface-stabilized FLC states by use of both conventional and oblique polarized infrared spectroscopy is proposed. It is found that the core moiety is tilted by an angle of about 7° to the surface of the cell windows. © 2003 American Institute of Physics.
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61.30.Eb Experimental determinations of smectic, nematic, cholesteric, and other structures
77.84.Nh Liquids, emulsions, and suspensions; liquid crystals
78.30.C- Liquids
33.15.Kr Electric and magnetic moments (and derivatives), polarizability, and magnetic susceptibility

Gouy phase shift of single-cycle picosecond acoustic pulses

N. C. R. Holme, B. C. Daly, M. T. Myaing, and T. B. Norris

Appl. Phys. Lett. 83, 392 (2003); http://dx.doi.org/10.1063/1.1590405 (3 pages) | Cited 16 times

Online Publication Date: 8 July 2003

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Ultrafast laser pulses are used to generate single-cycle picosecond acoustic pulses in thin metal films on silicon. For small initial excitation spot sizes, propagation of the acoustic pulses across a 485-μm Si crystal leads to significant diffraction effects. The temporal reshaping of the acoustic wave form due to diffraction is investigated, and we demonstrate that the acoustic far field can be reached. © 2003 American Institute of Physics.
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62.65.+k Acoustical properties of solids
43.20.El Reflection, refraction, diffraction of acoustic waves

Atom mirror etched from a hard drive

Benjamin Lev, Yves Lassailly, Chungsok Lee, Axel Scherer, and Hideo Mabuchi

Appl. Phys. Lett. 83, 395 (2003); http://dx.doi.org/10.1063/1.1592305 (3 pages) | Cited 13 times

Online Publication Date: 8 July 2003

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We describe the fabrication of an atom mirror by etching of a common hard drive, and we report the observation of specular retroreflection of 11 μK cesium atoms using this mirror. The atoms were trapped and cooled above the hard drive using the mirror magneto-optical trap technique, and upon release, two full bounces were detected. The hard drive atom mirror will be a useful tool for both atom optics and quantum computation. © 2003 American Institute of Physics.
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03.75.Be Atom and neutron optics
37.10.De Atom cooling methods
37.10.Gh Atom traps and guides
52.77.Bn Etching and cleaning
03.67.Lx Quantum computation architectures and implementations
81.65.Cf Surface cleaning, etching, patterning

Refraction as imaging signal for computerized (neutron) tomography

W. Treimer, M. Strobl, A. Hilger, C. Seifert, and U. Feye-Treimer

Appl. Phys. Lett. 83, 398 (2003); http://dx.doi.org/10.1063/1.1591066 (3 pages) | Cited 23 times

Online Publication Date: 8 July 2003

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Refraction of thermal neutrons was used as imaging signal for computerized neutron tomography. Using a special instrument, attenuation and refraction could be observed simultaneously, extracted and separated from each other, and two-dimensional (2D) images reconstructed from pure refraction data. Even in the case of no attenuation contrast, perfect 2D images of objects could be reconstructed using the refraction data only. © 2003 American Institute of Physics.
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81.70.Tx Computed tomography

Patterning damage in narrow trackwidth spin-valve sensors

J. A. Katine, Michael K. Ho, Yongho Sungtaek Ju, and C. T. Rettner

Appl. Phys. Lett. 83, 401 (2003); http://dx.doi.org/10.1063/1.1592014 (3 pages) | Cited 5 times

Online Publication Date: 8 July 2003

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Using a combination of electron-beam lithography and Ar ion milling, we have fabricated spin-valve sensors with widths ranging from 30 to 250 nm. Although the resistance of the sensors scales as expected with width, the giant magnetoresistance (GMR) ratio decreases with decreasing width, consistent with the presence of a region with negligible GMR at the edges of the sensors. Sensors patterned using a focused ion beam showed a similar but much greater effect. We attribute this behavior to edge damage associated with the patterning process. © 2003 American Institute of Physics.
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85.70.Kh Magnetic thin film devices: magnetic heads (magnetoresistive, inductive, etc.); domain-motion devices, etc.
81.16.Rf Micro- and nanoscale pattern formation
81.16.Nd Micro- and nanolithography
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.47.Gk Colossal magnetoresistance
07.07.Df Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
85.75.Ss Magnetic field sensors using spin polarized transport
75.50.Ss Magnetic recording materials
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