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  • 1
    Electronic Resource
    Electronic Resource
    Differential ac method of thermopower measurement (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 3053-3058 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new differential ac technique is described for rapid and continuous measurement of thermoelectric power of thin metallic ribbons over a wide temperature range. Sinusoidal heating of one thermocouple junction by means of a small resistive heater results in a measuring principle which eliminates spurious thermoelectric voltages in the lead wires and favorably benefits from ac signal processing. The resultant equilibrium temperature of the heated junction contains a constant term depending on thermal parameters of the system, and an oscillating term with a frequency-dependent amplitude. By choosing a suitable sample configuration no corrections are required for the thermal response of the system. By careful shielding of the measuring circuits and using modern lock-in amplifiers noise voltages can be reduced to less than 1 nV for measuring frequencies below 10 Hz. Measurements accurate to 1% are possible, using temperature differences smaller than 10 mK. The effectiveness of this technique is demonstrated by comparing our measurement of the thermoelectric power of an amorphous Fe80B20 alloy with measurements using conventional techniques and by studying the thermopower of an amorphous Fe90Zr10 alloy in the vicinity of its second-order magnetic phase transition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139195
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  • 2
    Electronic Resource
    Electronic Resource
    Morin-like spin reorientation in BiPb-2201 ferrates with iron in octahedral oxygen coordination : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5257-5259 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: From a Mössbauer spectroscopy study of the BiPbSrCaFe6+z ferrate, prepared under different conditions, strong evidence for a variety of Morin-like spin-reorientation processes similar to the ones occuring in hematite was found. The phase evolution, their energetical and dynamical Mössbauer parameters as well as the spin-rotational process are described in detail and finally correlated with a proposed mechanism. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361917
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  • 3
    Electronic Resource
    Electronic Resource
    57Fe hyperfine fields and magnetic anisotropy of Sm2Fe17Nx interstitials with intermediate nitrogen concentrations : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6035-6037 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: From the compositional dependence of the hyperfine fields at the iron sites of Sm2Fe17Nx alloys with 0≤x≤2.94, evidence for cone anisotropy for x=0.4 and uniaxial anisotropy at least for x≥0.81 has been found. The analysis of the volume dependence of the hyperfine fields allowed us to separate contributions arising from the anisotropy of the orbital component of the iron moment and from the change of the spin moments owing to magnetovolume and bonding effects. The temperature dependence of the average hyperfine field and of the hyperfine fields at the four different nonequivalent Fe sites suggests weak itinerant ferromagnetism for Sm2Fe17N2.94.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353461
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  • 4
    Electronic Resource
    Electronic Resource
    LiNiO2: Quantum liquid or concentrated spin glass? : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6813-6815 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: From the magnetic and Mössbauer spectroscopy study of LiNi1−xFexO2 with x=0, 0.01, 0.05, and 0.10 evidence for strong ferromagnetic correlations and spin freezing at low temperatures was found, reminding many characteristic features of spin glass behavior in variance with models describing the ground state of LiNiO2 as a quantum liquid.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356816
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  • 5
    Electronic Resource
    Electronic Resource
    Metamagnetism and spin arrangement in Nd6Fe13Sn : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6586-6588 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A magnetic and Mössbauer spectroscopy study of nonoriented and magnetically oriented samples of Nd6Fe13Sn was performed. At 4.2 K a metamagnetic transition takes place in a field of 7.1 T. Strong evidence for antiferromagnetic spin arrangements in the iron magnetic sublattice and antiferromagnetism of the Nd moments with only a small contribution to the net magnetization in fields up to 14 T was found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356903
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  • 6
    Electronic Resource
    Electronic Resource
    Microwave/millimeter-wave generation in a counterstreaming-beam-plasma system (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 3057-3060 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Radiation from 8 to 60 GHz is generated by injecting counterstreaming, high-power (up to 50 keV and 4 A) electron beams into an unmagnetized, plasma-loaded waveguide. The radiation is emitted at twice the plasma frequency and is amplitude modulated on the ion plasma frequency time scale. The beam-to-millimeter-wave power conversion efficiency at 31 GHz is (approximately-greater-than)0.04%. A turbulence theory model is consistent with the radiation characteristics and power scalings.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354621
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  • 7
    Electronic Resource
    Electronic Resource
    Electrostatic ion cyclotron instabilities in negative ion plasmas (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 1202-1211 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of negative ions on the collisionless electrostatic ion cyclotron instability (EICI) is investigated analytically and numerically. The singly ionized negative ion species has mass greater than or equal to the mass of the singly ionized positive ion species. Standard linear Vlasov theory is used to estimate the critical electron drift velocity. It is shown that the critical drifts for the excitation of both the light and heavy ion EIC modes decrease as the relative density of negative ions increases. Our results are compared with available negative ion plasma experiments concerning the EICI, and possible applications to experiments in the ionosphere are briefly discussed. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871744
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  • 8
    Electronic Resource
    Electronic Resource
    Low frequency drift instabilities in a dusty plasma (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 644-649 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Low frequency drift instabilities are investigated in a dusty magnetized plasma with negatively charged grains in which locally there is an electron density gradient which is opposite in sign to a dust density gradient. Frequencies less than the ion gyrofrequency but much larger than the dust gyrofrequency are considered. Two different equilibria are considered that are characterized by ρd≥Lnd, where ρd is the dust gyroradius and Lnd is the dust density scale length. Instabilities analogous to the universal instability and to the lower-hybrid-drift instability (with the lower-hybrid frequency in this case associated with the dust) are investigated. Possible applications to dusty space plasmas such as the spoke regions of Saturn's B-ring are discussed. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871891
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  • 9
    Electronic Resource
    Electronic Resource
    Instability of ion flows in bounded dusty plasma systems (1998)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 5 (1998), S. 3786-3788 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of longitudinal boundaries on electrostatic instabilities driven by an ion beam in a dusty plasma is considered. In analogy with instabilities in electron-ion plasma diodes, in this case both the low-frequency ion-space-charge waves and ion-dust waves can be unstable. The growth rates and ion current thresholds are estimated. The present investigation should help to design a large scale dusty plasma device to study these low-frequency analogs of instabilities in bounded beam-plasma systems. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872743
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  • 10
    Electronic Resource
    Electronic Resource
    Thin-film bolometer with fast response (1987)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 58 (1987), S. 276-278 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A short summary on recent developments in semiconducting temperature sensors is given. A thin-film germanium resistor is described in detail, which is used for fast and accurate thermometry in a nonadiabatic microcalorimeter. The use of only standard vapor deposition techniques makes this sensor also available to research groups lacking access to semiconductor technology. The general good performance and its good mechanical properties have the potential of numerous applications in fast and accurate low-temperature thermometry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139321
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