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  • Electronic Resource  (2)
  • 1985-1989  (1)
  • 1970-1974  (1)
  • Electronic Resource  (2)
  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 3831-3831 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetoresistance detectors are used to observe the magnetic state of microscopic parts of magnetized samples. The planar Hall effect can be used instead. Both effects can be applied to find out the logic "1'' or "0'' state of magnetic storage devices. They also can be used for a quantitative and sensitive measurement of magnetic fields as well as a magneto-elastic strain gauge. Soft magnetic permalloy films are appropriate for the field detection while amorphous Fe1−xBx films are suitable for the strain measurements. The sensor films have to show a uniaxial anisotropy. The strength of it determines the range of the detectable fields and strains. The sensitivity of the magnetoresistance emr=dΔU/dH=2( ρ⊥−ρ(parallel)) 1/db JH/HK2(V/Oe) depends linearly on the magnetic field H applied along the hard axis. l, d, b are the film length, thickness and width, respectively. The sensitivity of the planar Hall effect, which is given by epl=dUpl/dH =( ρ(parallel)−ρ⊥)s/db J(1/HK) is independent of the applied field along the hard axis as long as H(very-much-less-than)HK. s is the separation of the Hall contacts. Both sensitivities are reciprocal to the uniaxial anisotropy, HK as long as the applied field, H is smaller than HK. The theoretically expected sensitivity usually is decreased by domain splitting and the influence of the magnetization ripple. The smaller HK is (the larger the sensitivity is) the stronger is the influence of the ripple. It gives an upper limit of the interval in which external fields or applied strains can be quantitatively measured. Double layered films can prevent the domain splitting. The sensor theory including the ripple and experimental data will be given.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 3725-3731 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Orthoamides, XXIV. Synthesis and Reactions of Amide Thioacetals and Aminal ThioestersThe amide thioacetals 2 are obtained by reaction of the N,N-dimethylformamide dimethyl sulfate adduct 1 with sodium thiolates or by treatment of N,N-dimethylformamide diethyl acetal (3) with alkanthiols. Aminal thioesters 11 are formed by reaction of tetramethylformamidinium methyl sulfate (10) with alkali alkanethiolates or by treatment of aminal-tert-butylester 12 with alkanethiols. The compounds have properties similar to those of their oxygen homologues.
    Notes: Amidthioacetale 2 erhält man aus dem N,N-Dimethylformamid-Dimethylsulfat-Addukt 1 und Natriumthiolaten oder aus N,N-Dimethylformamid-diäthylacetal (3) und Alkanthiolen, Aminalthioester 11 aus Tetramethylformamidinium-methylsulfat (10) und Alkali-alkanthiolaten oder aus dem Aminal-tert-butylester 12 und Alkanthiolen. Die Verbindungen zeigen ähnliche Eigenschaften wie ihre Sauerstoff-Homologen.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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