Browsing Physics by Date of Publication
Now showing items 41-60 of 2105
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Magnetization of a Dy(Fe11Ti) single crystal
(American Physcial Society, 1990)Magnetization curves have been measured in the temperature range from 4.2 to 300 K along the [100], [110], and [001] directions of a Dy(Fe11Ti) single crystal in fields up to 7 T. The magnetic moment is along [100] below ... -
Giant transverse hysteresis is an asperomagnet
(American Physical Society, 1990)Comparison of the magnetoresistance of amorphous thin films of Tb80U20 and the nonmagnetic analog Y80U20 reveals hysteresis for the terbium alloy, which extends to fields in excess of 8 T at 4.2 K. Hysteresis is found in ... -
Photodarkening effect and the optical nonlinearity in a quantum-confined, semiconductor-doped glass
(1990)The room-temperature optical nonlinear behavior of a quantum-confined CdSe-doped glass with ?25-?-size particles is examined. The photodarkening effect is found to be important in this glass. The effect and its influence ... -
Linear and nonlinear waveguiding in Rhodamine-doped
(1991)Planar waveguiding of 350-ps pulses, at a wavelength in the region of the long-wavelength tail of the absorption, is observed by coupling by prism into spun films of Rhodamine-B-doped epoxy films. In a 13-?.m-thick film, ... -
Large infrared nonlinear optical response of C60.
(1991)C60 buckminsterfullerene exhibits a large ultrafast third-order nonlinear optical response. Degenerate four-wave-mixing measurements in C60-benzene solutions were performed using 50-psec pulses at l.064Itm.The magnitude ... -
Optical detection of electron-nuclear double resonance for an S=1 luminescent center in GaP:O
(1991)The origin of a triplet (S=1) optically detected magnetic-resonance (ODMR) spectrum observed in the luminescence of GaP:O has been the subject of recent controversy. Originally identified with the negative-charge state of ... -
The systemic redshift of the quasar 1331 + 170
(American Astronomical Society, 1991)Infrared spectra covering the 1.6- and 2-micron regions of the quasar 1331 + 170, redshift z = 2.09, were obtained with the CGS4 spectrometer at the UK Infrared Telescope. These spectra show redshifted H-alpha, H-beta, and ... -
Non-linear optical properties of Group 10 metal alkynyls and their polymers
(1991)Conjugated diacetylene and phenylacetylene systems incorporating Group 10 transition-metal complexes have been obtained via lithium acetylide intermediates. In the UV?VIS spectra, the positioning of the longest-wavelength ... -
Progress towards spin-polarized scanning tunneling microscopy
(1992)Solutions to the main problems in operating a spin?polarized scanning tunneling microscope are discussed. Preliminary experimental results obtained in the course of implementing these solutions are reported. Atomic resolution ... -
Transient nonlinear optical behavior of fluorescein-doped boric acid glass
(1992)The nonlinear optical properties of fluorescein-doped boric acid glass films have been investigated with sub-nanosecond laser pulses. With the use of degenerate four-wave mixing, large third-order susceptibilities of X(3) ... -
Gas-phase interstitial modification of rare-earth intermetallics.
(IEEE, 1992)The gas-phase interstitial modification of rare-earth intermetallics is studied. Net reaction energies for nitrogen in Sm2Fe17 and Nd(Fe11Tl) are U 0=-57 kJ/mole and U0=-51 kJ/mole, respectively. The equilibrium nitrogen ... -
Asymmetric Fabry-Perot device arrays with low insertion loss and high uniformity
(IEEE, 1992)We report on arrays of normally ON asymmetric Fabry-Perot modulator (AFPM) devices which exhibit a high degree of uniformity between devices, with a thickness variation across an array of 0.07%. The devices in one array ... -
Origin of the x-ray-absorption fine structure in photon-stimulated ion desorption from Si-adsorbate systems
(1992)There is no general agreement on whether photon-stimulated ion desorption (PSID) extended and near-edge x-ray-absorption fine structure (EXAFS and NEXAFS) can provide surface structural information. To address this question, ... -
Optical and magnetic-circular-dichroism-optically-detected-magnetic-resonance study of the Co2+ ion in LiGa5O8
(American Physical Society, 1992)Optical and magnetic-circular-dichroism?optically-detected-magnetic-resonance studies have been carried out on Co-doped LiGa5O8. The Co ions are found to be predominantly in the 2+ charge state and to substitute for ... -
Magnetization and 57Fe hyperfine fields in Y2Fe17Z3-??(Z=H, C, or N) interstitial compounds
(American Physical Society, 1992)Measured magnetization and 57Fe hyperfine fields at T?_0 K for Y2Fe17 and Y2Fe17Z3-??, with Z=H, C, or N and ???_0.5, are analyzed to determine the influence of the interstitial atoms on the 3d magnetism. All are weak ... -
Evidence for selective imaging of different magnetic ions on the atomic scale by using a scanning tunnelling microscope with a ferromagnetic probe tip.
(IOP Publishing, 1992)Atomic resolution has been obtained on a magnetite (Fe3O4(001)) surface using a scanning tunnelling microscope with nonmagnetic tungsten and ferromagnetic iron tips. Selective imaging of Fe2 + and Fe3 + on B-sites is ... -
All-optical synchronization and multiplication of the frequency of mode-locked signals
(IEEE, 1993)We report all-optical synchronized multiplication by rational fractions of the modulation frequency of optical signals in self-pulsing two-section semiconductor laser diodes. The effect is based on the overlap of harmonics ... -
Charge freezing and surface anisotropy on magnetite (100)
(1993)Scanning tunneling microscope images of the (100) surface of slightly nonstoichiometric magnetite taken at room temperature show static arrays of pairs of Fe2+ ions with short?range order, and a charge fluctuation time ... -
Nucleation field and energy product of aligned two-phase magnets - progress towards the '1 MJ/m3' magnet
(IEEE, 1993)Exchange hardening of nanostructured two-phase systems composed of an aligned hard phase and a soft phase with high magnetization is investigated using a micromagnetic approach which accounts for intereactions between the ... -
Giant energy product in nanostructured two-phase magnets
(American Physical Society, 1993)Exchange hardening of nanostructured two-phase systems composed of an aligned hard phase and a soft phase with high magnetization is investigated using an approach which yields analytic nucleation fields from the micromagnetic ...