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  • Articles: DFG German National Licenses  (4)
  • 1985-1989  (1)
  • 1960-1964  (3)
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  • Articles: DFG German National Licenses  (4)
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Years
Year
  • 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
    Springer
    The European physical journal 165 (1961), S. 261-287 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Zusammenfassung Es wird ein Verfahren angegeben, optimale Eisenaufdampfschichten herzustellen. Diese Schichten unterscheiden sich von allen unter anderen Bedingungen aufgedampften durch niedrigere Koerzitivkraft und eindeutige Reproduzierbarkeit der Dickenabhängigkeit der Koerzitivkraft. Die Hysteresekurve optimaler Schichten ist stets rechteckig. Die damit verbundene Anisotropie ist eine Folge des Restgas-einflusses. Die Schichten zeigen bis herab zu 30 Å Dicke die Magnetisierung des kompakten Materials.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 315 (1962), S. 283-290 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The RAMAN- and TR-spectra of solid, fused, and dissolved (CH3)3SnOH and liquid (CH3)3SnOSn((CH3)3 are reported and the frequencies axe assigned. The spectra of Cl3SnOH and Cl3SnOCH3 · CH3OH are measured to establish the assignement of the SnO-stretching frequency. (CH3)3SnOH forms no H-bridges but associates building Sn-O-Sn-bridges. In aqueous solutions, (CH3)3SnOH is partially dissociated.
    Notes: Die RAMAN- und IR-Spektren des festen und in H2O bzw. CCl4 gelösten (CH3)3SnOH und des flüssigen (CH3)3SnOSn(CH3)3 werden mitgeteilt und die Frequenzen zugeordnet.Zur Sicherung der SnO-Valenzschwingung wurden außerdem die Spektren des Cl3SnOH und Cl3SnOCH3 · CH3OH gemessen. Die Spektren zeigen, daß das |CH3|3SnOH nicht über Wasserstoffbrücken, sondern über Sn-O-Sn-Brücken assoziiert. Der so erreichte Zustand ist offensichtlich sehr stabil, so daß das (CH3)3SnOSn(CH3)3 bereits bei Einwirkung kleinster Mengen Wasser in (CH3)3SnOH übergeht.In den wäßrigen Lösungen des (CH3)3SnOH treten neben undissoziierter Base (CH3)3Sn+-Kationen auf.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 321 (1963), S. 224-233 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Raman and IR spectra of [(CH3)3SnOH]2 · (CH3)3SnBr, (CH3)3 SnOH · (CH3)3Br · H2O and [(CH3)3Sn]3OBr are reported and their frequencies are assigned. The distances of lattice planes are communicated. It is very probable that in these complex salts [(CH3)3Sn]+ cations exist besides (CH3)3SnOH and (CH3)3SnOSn(CH3)3, respectively. The association is caused by interaction of the oxygen of one constituent of the complex with the cation. In contrast to solid (CH3)3SnOH, in the complex compounds hydrogen bonds may exist between the OH groups. Bromide is arranged as ion within the external sphere.The strong hygroscopicity of [(CH3)3Sn]3 O Br results from the extremely low coordination of tin. The stabilities of the complex compounds are discussed in regard with coordination problems.
    Notes: Die Raman- und IR-Spektren von [(CH3)3SnOH]2 · (CH3)3SnBr, (CH3)3SnOH (CH3)3SnBr · H2O und [(CH3)3Sn]3OBr werden mitgeteilt, und die Frequenzen den einzelnen Normalschwingungen zugeordnet. Netzebenenabstände werden angegeben. In den Komplexsalzen liegen sehr wahrscheinlich [(CH3)3Sn]+-Ionen neben (CH3)3SnOH bzw. (CH3)3SnOSn-(CH3)3 vor. Die Assoziation erfolgt durch Wechselwirkung des Sauerstoffs des einen Komplexpartners mit dem Kation. Im Gegensatz zum festen (CH3)3SnOH sind in den Komplexverbindungen Wasserstoffbrückenbindungen zwischen den einzelnen OH-Gruppen sterisch möglich. Das Brom ist als Ion in der äußeren Sphäre gebunden. Die starke Hygroskopizität des [(CH3)3Sn]3 O Br beruht darauf, daß in diesem Komplex das Zinn koordinativ besonders wenig abgesättigt ist. Die Stabilität der Komplexe wird in Abhängigkeit vom Koordinationsproblem diskutiert.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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