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13 Mar 2000

Volume 76, Issue 11, pp. 1353-1479

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Two-stage superconducting-quantum-interference-device amplifier in a high-Q gravitational wave transducer

Gregory M. Harry, Insik Jin, Ho Jung Paik, Thomas R. Stevenson, and Frederick C. Wellstood

Appl. Phys. Lett. 76, 1446 (2000); http://dx.doi.org/10.1063/1.126059 (3 pages) | Cited 15 times

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We report on the total noise from an inductive motion transducer for a gravitational-wave antenna. The transducer uses a two-stage superconducting quantum interference device (SQUID) amplifier and has a noise temperature of 1.1 mK, of which 0.70 mK is due to back action noise from the SQUID chip. The total noise includes thermal noise from the transducer mass, which has a measured Q of 2.60×106. The noise temperature exceeds the expected value of 3.5 μK by a factor of 200, primarily due to voltage noise at the input of the SQUID. Noise from flux trapped on the chip is found to be the most likely cause. © 2000 American Institute of Physics.
Show PACS
85.25.Dq Superconducting quantum interference devices (SQUIDs)
04.80.Nn Gravitational wave detectors and experiments
95.55.Ym Gravitational radiation detectors; mass spectrometers; and other instrumentation and techniques
84.30.Le Amplifiers
84.40.Ba Antennas: theory, components and accessories

DyFe2(110) nanostructures: Morphology and magnetic anisotropy

A. Mougin, C. Dufour, K. Dumesnil, N. Maloufi, and Ph. Mangin

Appl. Phys. Lett. 76, 1449 (2000); http://dx.doi.org/10.1063/1.126060 (3 pages) | Cited 1 time

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Single-crystalline DyFe2(110) nanosystems have been obtained by molecular-beam epitaxy. From reflection high-energy electron diffraction observations, the systems have been shown to grow in a Stranski–Krastanov mode. Depending on elaboration conditions (substrate temperature and nominal thickness), dots with anisotropic shape or continuous films with low surface roughness are obtained. Compared to the bulk compounds, the epitaxial systems are strained because of thermal differential contraction and exhibit modifications of easy-magnetization direction compared to bulk. The magnetization reversal process is correlated to the morphology of the layers. © 2000 American Institute of Physics.
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68.55.-a Thin film structure and morphology
75.70.Ak Magnetic properties of monolayers and thin films
81.15.Hi Molecular, atomic, ion, and chemical beam epitaxy
68.35.B- Structure of clean surfaces (and surface reconstruction)
75.50.Kj Amorphous and quasicrystalline magnetic materials
81.07.-b Nanoscale materials and structures: fabrication and characterization
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.30.Gw Magnetic anisotropy

Anisotropic magnetic susceptibility of multiwalled carbon nanotubes

F. Tsui, L. Jin, and O. Zhou

Appl. Phys. Lett. 76, 1452 (2000); http://dx.doi.org/10.1063/1.126061 (3 pages) | Cited 19 times

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Magnetic susceptibility of partially aligned multiwalled carbon nanotubes has been studied using superconducting quantum interference device magnetometry. Partial alignment of multiwalled nanotubes was produced by uniaxially straining composites of carbon nanotubes embedded in polymer matrices. The degree of alignment was determined by x-ray diffraction. The observed magnetic response is diamagnetic and anisotropic with the component along the nanotubes less diamagnetic than that of the perpendicular. The observed anisotropy is consistent with theoretical predictions, but it contradicts earlier experimental findings. © 2000 American Institute of Physics.
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75.20.Ck Nonmetals
61.48.-c Structure of fullerenes and related hollow and planar molecular structures

Chemical ordering of epitaxial FePd deposited on ZnSe and the surfactant effect of segregated Se

C. Bourgognon, S. Tatarenko, J. Cibert, L. Carbonell, V. H. Etgens, M. Eddrief, B. Gilles, A. Marty, and Y. Samson

Appl. Phys. Lett. 76, 1455 (2000); http://dx.doi.org/10.1063/1.126062 (3 pages) | Cited 7 times

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We describe the experimental conditions under which a thin film (500 Å thick) of the ferromagnetic alloy FePd can be grown epitaxially onto a thin (100 nm thick) ZnSe(001) layer on a GaAs(001) substrate. A two-dimensional growth could be achieved by using a Pt seeding layer inserted between FePd and ZnSe. During the growth of the metallic layers, the segregation of Se atoms at the surface involves a dramatic effect on the formation of the uniaxial L10 FePd ordered phase. As a result, no perpendicular magnetic anisotropy was observed. The removal of the Se atoms from the Pt surface by a gentle ion bombardment, enables the growth of a FePd layer exhibiting a large anisotropy constant of about 1.2×107 erg/cm3 along the growth direction with a marked perpendicular magnetic domain configuration. © 2000 American Institute of Physics.
Show PACS
75.70.Kw Domain structure (including magnetic bubbles and vortices)
75.50.Bb Fe and its alloys
68.55.-a Thin film structure and morphology
68.35.Fx Diffusion; interface formation
75.30.Gw Magnetic anisotropy
75.60.Ch Domain walls and domain structure
61.82.Bg Metals and alloys
61.80.Jh Ion radiation effects
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