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  • 1
    ISSN: 1432-0649
    Keywords: 78 ; 42.65 ; 61.40 ; 73 ; 73.20 ; 82 ; 81.15
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 176-178 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The design of a computer-automated capacitance-conductance bridge is described. The bridge operates in the frequency range 40 Hz–40 kHz with a resolution better than 0.1% at signal levels as low as 400 μV and is most useful for studying the complex impedance of nonlinear devices as a function of the test signal amplitude, frequency, and waveform. Of particular interest is the stability problem associated with feedback during the self-balancing process for the two impedance phases.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 62 (1991), S. 1754-1766 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Direct detection of thin-film and interfacial electron-spin resonance (ESR) pushes conventional techniques to the noise limit for those techniques and requires use of large-area samples. Several microstrip resonator structures are compared here to conventional techniques and experimental results reported. Aluminum microstrip resonators are shown to have from 3 to 10 times the sensitivity to two-dimensional systems as waveguide cavities, while needing only about 1/20th the sample area. A microstrip resonator metal-oxide-superconductor field-effect-transistor structure for study of inversion layer conduction electron-spin resonance is reported in which the resonator functions as the gate, and ohmic contact is made to the inversion layer. A "microstrip induction spectrometer'' is described in which a bimodal microstrip resonator is used along with a cryogenically cooled amplifier for study of lines with very long relaxation times. The ultimate sensitivity to Curie law spins of this spectrometer is 1×108 spins in an area of 1 cm2 at 4.2 K for a 1-G linewidth at the onset of saturation. Superconducting microstrip resonators for ESR are reported and their use discussed.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3934-3939 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A new technique for investigating conduction electron magnetization is presented. A coupling between electronic charge and spin transport in ferromagnetic metals follows from generalizing the linear transport equations. In practice, this means that ferromagnetic films act as conduction electron spin polarizers. At an interface between a ferromagnetic and a paramagnetic metal, one can inject and detect nonequilibrium magnetization in the paramagnet, and use sensitive electric measurements to probe spin transport. Application of a small external magnetic field dephases the spins. The result is a new technique for measuring conduction spin relaxation times, which is demonstrated on bulk aluminum samples. Three advantages of the technique make it applicable to a wide range of studies. (1) The measurement can be made in the limit of zero field so that systems with interesting properties which are altered or destroyed by magnetic fields can now be probed (spin glasses, superconductors, metals with g anisotropies). (2) A SQUID voltmeter with picovolt noise floor provides a sensitivity that allows detection of one nonequilibrium spin in a background of 1012 equilibrium spins. (3) The experimental geometry utilizes microfabrication techniques and is ideal for application to small-size systems that are inaccessible to conventional electron spin resonance methods. The geometry conveniently needs but one good surface; other sample surfaces are available for alteration in situ for the study of surface relaxation effects. Finally, there are obvious applications to the study of ferromagnets and interfaces.
    Type of Medium: Electronic Resource
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