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  • 1
    Electronic Resource
    Electronic Resource
    Performance of dc SQUIDs with resistively shunted inductance (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 1451-1453 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have fabricated and characterized the noise performance of well-coupled Nb-Pb alloy edge junction dc superconducting quantum interference devices (SQUIDs) with a resistively shunted inductance. The extra damping resistor removes the resonances in the current-voltage characteristics resulting in a very low value of the extrinsic energy sensitivity in flux-locked-loop operation. Numerical simulations, with the junction capacitance included, indicate that the damping resistance does not degrade noise performance until it is significantly less than the junction-shunting resistance. We also tested different SQUID designs and demonstrated that a large SQUID inductance, proposed earlier to be desirable when resistively shunted, can seriously affect the low-frequency flux noise.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101583
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetic resonance of a small platinum particle using an integrated dc SQUID (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 1305-1307 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the detection of pulsed nuclear magnetic resonance in a single 50 μm particle of platinum metal at 4 K and in an applied field of 60 G. The flux from the precessing spins is detected directly by an integrated dc SQUID minisusceptometer. The device can operate in applied fields of up to 100 G without degradation of noise performance. The particle contains ≈1015 spin-active nuclei while the signal intensity corresponds to flux from 2.5×1014 spins all located at the center of the pickup loop. This result represents a significant improvement in the sensitivity of NMR and may be useful in the characterization of materials with small spin populations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.112102
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  • 3
    Electronic Resource
    Electronic Resource
    Effects of radio frequency radiation on the dc SQUID (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 100-102 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effects of radio frequency radiation on the dc SQUID are examined. Simulations show how the shape of the SQUID transfer characteristic is distorted by radio frequency interference (RFI). How this affects three commonly used SQUID modulation methods is discussed, and the results explain why we experimentally observe the bias current reversing readout method to be the least susceptible to RFI. The commonly seen increase in the low frequency flux noise power spectrum of dc SQUIDs in unshielded environments is also explained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.113046
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Subpicosecond electrical pulse generation using photoconductive switches with long carrier lifetimes (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 1046-1047 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using a new mechanism of electrical pulse generation, we have generated 350 fs (full width at half maximum) electrical pulses on a coplanar transmission line, fabricated on an unimplanted silicon-on-sapphire substrate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100792
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  • 5
    Electronic Resource
    Electronic Resource
    Temperature dependence of the magnetic 1/f noise in Eu0.4Sr0.6S (invited) (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3678-3682 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We analyze in detail a novel integrated SQUID technique for studying magnetic noise and susceptibility. In particular, we show how the susceptibility, π/2 rule and the fluctuation-dissipation theorem (FDT) are affected by large demagnetizing factors and by the geometry of our pickup and field coils. We present data on the spin glass Eu0.4Sr0.6S as a function of temperature. We confirm the FDT and show evidence against the conventional power-law dynamics in the spin-glass phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338660
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  • 6
    Electronic Resource
    Electronic Resource
    Design of improved integrated thin-film planar dc SQUID gradiometers (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 4322-4325 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Key issues in the design of improved first and second derivative, thin-film, planar dc SQUID gradiometers are discussed. The introduction of a planar coupling scheme to optimally couple the planar dc SQUID to the gradiometer pickup loops leads to significantly increased sensitivity as well as elimination of the sensitivity differences between series and parallel gradiometer loop configurations. Two-hole and figure-8 SQUID designs are presented which are consistent with intrinsic gradiometer balance (approximately-less-than)10−4 against uniform field changes. Straightforward calculations together with data from existing low-noise SQUIDs suggest improvements in gradient sensitivity on the order of 102 over existing planar gradiometers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335519
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  • 7
    Electronic Resource
    Electronic Resource
    Josephson cross-sectional model experiment (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 2550-2574 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This paper describes the electrical design and evaluation of the Josephson cross-sectional model (CSM) experiment. The experiment served as a test vehicle to verify the operation at liquid-helium temperatures of Josephson circuits integrated in a package environment suitable for high-performance digital applications. The CSM consisted of four circuit chips assembled on two cards in a three-dimensional card-on-board package. The chips (package) were fabricated in a 2.5-μm (5-μm) minimum linewidth Pb-alloy technology. A hierarchy of solder and pluggable connectors was used to attach the parts together and to provide electrical interconnections between parts. A data path which simulated a jump control sequence and a cache access in each machine cycle was successfully operated with cycle times down to 3.7 ns. The CSM incorporated the key components of the logic, power, and package of a prototype Josephson signal processor and demonstrated the feasibility of making such a processor with a sub-4-ns cycle time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335444
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  • 8
    Electronic Resource
    Electronic Resource
    Integrated magnetic spectroscopy of dilute magnetic semiconductors (invited) (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3532-3536 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An integrated dc SQUID magnetic spectrometer has been developed to obtain direct high-resolution measurements of optically induced magnetization in a 10-μm-diam sample of Cd0.8Mn0.2Te. The static and picosecond dynamics of the magnetic response have been studied and are seen to be strikingly dependent on the energy and polarization of the optical excitation. The entire sample magnetization changes upon illumination, and the disturbed spins relax via an efficient spin coupling to the lattice.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338715
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  • 9
    Electronic Resource
    Electronic Resource
    Superconducting quantum interference device magnetometry during ultrahigh vacuum growth (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 3401-3403 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An in situ study of the absolute magnetic moment of thin ferromagnetic films grown in ultrahigh vacuum (UHV) is described. The moments are measured using a newly innovated technique, rotating sample superconducting quantum interference device (SQUID) magnetometry (RSSM), in which the sample is spun at low frequency close to an ex situ second derivative superconducting pickup loop structure coupled to a rf SQUID. The sensitivity of the measurements is ≈10−6 emu, which corresponds to 1/10 of an atomic layer of Fe over a 0.5 cm2 area, and the geometry of the pickup loops makes the magnetometer very insensitive to background laboratory noise. The moment of Cr grown on Fe was measured. It was determined that the first two layers of Cr have an average moment of 0.75 μB per atom, and are antiferromagnetically aligned to the Fe film moment. The simplicity of RSSM and the fact that the absolute moment is measured makes this a powerful new approach for characterization of magnetic samples in UHV. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.112406
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  • 10
    Electronic Resource
    Electronic Resource
    Low-noise modular microsusceptometer using nearly quantum limited dc SQUIDs (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 2108-2110 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A flexible combination of superconducting integrated circuits was used to construct a low-temperature magneto-optic microsusceptometer utilizing a dc superconducting quantum inteference device (SQUID) detector operating near the quantum limit (coupled energy sensitivity of 1.7(h-dash-bar)). Miniature pick-up loop assemblies on transparent substrates were joined by superconducting interchip connections to a thin-film dc SQUID, which is in turn read out by a second dc SQUID connected to room-temperature electronics. Measurements on an 8.5-μm-diam titanium dot evaporated directly into the pick-up loop demonstrate a spin sensitivity of ∼103 spins/(Hz)1/2 at T=290 mK.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100291
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