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  • 1
    Electronic Resource
    Electronic Resource
    Atomic structure in amorphous and multilayered films: Origins of magnetic anisotropy (invited) (abstract) : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 5781-5781 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: To understand the microscopic mechanism for the magnetic anisotropy, a description of the atomic structure, particularly structural anisotropy, is a crucial first step. Here is described an observation of structural anisotropy by synchrotron x-ray-diffraction experiments on two notable magneto-optical materials having perpendicular anisotropy, namely sputter-deposited amorphous TbFeCo films and 〈111〉-oriented Co/Pt multilayered films. In the as-deposited Tb26Fe62Co12 films, the scattering intensity I(Q) were measured with the scattering vector Q nearly perpendicular and nearly parallel to the film plane. Structural anisotropy was observed to be uniaxial and anelastic, suggesting the presence of the bond-orientational anisotropy, or an anisotropic distribution of the nearest-neighbor bond orientation. In a multilayered Co (3 A(ring))/Pt (18 A(ring)) film epitaxially grown on a GaAs 〈111〉 substrate, scattering intensity was measured for the scattering vector Q covering a plane with a major component perpendicular and a minor component parallel to the film plane. The diffraction peaks were found to have a large width parallel to the film plane, indicating that there is strong in-plane disorder. Atomic interdiffusion was evaluated from the first two superlattice peaks by integrating the intensity in the film plane of the 〈111〉-oriented film, and was found to be similar to the 〈001〉-oriented film where magnetic easy axis is in the film plane. In the 〈111〉-oriented Co/Pt, however, a Lorentzian peak shape of the intensity distribution in the film plane was observed, indicating the presence of uniaxial structural defects creating 1/r strain field in the film plane. Both types of structural anisotropy could be responsible for the perpendicular magnetic anisotropy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350159
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  • 2
    Electronic Resource
    Electronic Resource
    Bond-orientational anisotropy and anelastic deformation in sputter-deposited amorphous TbFeCo films : 35 th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5448-5450 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Results of a synchrotron x-ray-scattering study on the structural anisotropy of sputter-deposited amorphous Tb26Fe62Co12 thin films are described, and the mechanisms which lead to the observed structural and magnetic anisotropies are discussed. The observed structural anisotropy is characteristic of bond-orientational anisotropy and is incompatible with the atomic pair-ordering model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348005
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  • 3
    Electronic Resource
    Electronic Resource
    A heating model including effects on magnetoresistance (MR) in MR and giant MR heads (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 5392-5394 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An analytic model is presented that describes current induced heating effects in giant magnetoresistive (GMR) heads. Unlike previous transmission line models, the model includes temperature effects on the measured GMR response of the head in addition to changes in the temperature and the resistance. The response of the head will decrease with temperature in part due to the negative thermal coefficient for the GMR. The model predicts that the measured GMR response does not decrease as much as indicated by the thermal coefficient since the signal is enhanced by the change in temperature due to the GMR response to the applied field. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373354
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  • 4
    Electronic Resource
    Electronic Resource
    Giant magnetoimpedance of glass-covered amorphous microwires of Co–Mn–Si–B and Co–Si–B (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 4445-4447 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A study of magnetic hysteresis and giant magnetoimpedance (GMI) in amorphous glass-covered Co–Si–B and Co–Mn–Si–B wires is presented. The wires, about 10 μm in diameter, were obtained by a glass-coated melt spinning technique. Samples with positive magnetostriction (MS) have a rectangular bistable hysteresis loop. A smooth hysteresis loop is observed for wires with nearly zero MS. When the MS is negative, almost no hysteresis is observed. The GMI was measured in the frequency range between 20 Hz and 30 MHz. The shapes of the impedance versus field curves are qualitatively similar to each other for both positive and zero MS samples. The impedance is maximum at zero field, and decreases sharply in the range of 10–20 Oe. For the negative MS wires, when the driving current is small, the impedance is maximum at a finite external field. The position of the maximum approaches zero with increasing current. The contributions of the moment rotation and domain wall motion in the three cases are discussed. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370369
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  • 5
    Electronic Resource
    Electronic Resource
    Temperature programmed desorption using time-of-flight mass spectrometry (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 3502-3505 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new method of thermal programmed desorption (TPD) using time-of-flight mass spectrometry (TOFMS) is developed for simultaneous detection, in wide mass ranges, of large molecules and their surface reaction products. It provides a three-dimensional (3D) TPD spectrum that contains a complete set of conventional two-dimensional (2D) TPD spectra of all the masses in the mass range of interest. As an example, we present a 3D TPD spectrum of (methylcyclopentadienyl)Ir(1,5-cyclooctadiene), molecular weight 379.53 AMU, on a rhodium surface. The 3D TPD spectrum comprises TOF mass spectra, from 1 to 385 AMU, accumulating 10 000 scans every 0.6 s. By covering the whole mass range of interest in one TPD experiment, the new TOFMS-TPD eliminates guesswork required in TPD using quadrupole mass spectrometry that limits the number of masses to follow. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1286719
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  • 6
    Electronic Resource
    Electronic Resource
    Studies of remanence in granular Ni–SiO2 films : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6137-6139 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have studied microstructure and remanent magnetization of the granular Ni–SiO2 films. Both analysis of the transmission electron microscope images and that of the particle size distribution via remanence studies support the hypothesis that both superparamagnetic and ferromagnetic components coexists in the nearly percolating films. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362049
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  • 7
    Electronic Resource
    Electronic Resource
    Alternating current (ac) susceptibility studies in Ni-SiO2 granular film : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6022-6024 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Alternating current (ac) magnetic susceptibility was measured as a function of frequencies (1 Hz–1 kHz) and temperatures (5–300 K) in nominal Ni-SiO2 granular films for zero field cooled samples. When temperature is well below and well above the blocking temperature Tb, the real part of the susceptibility, χ′, remains independent of frequency, while the imaginary part of the susceptibility, χ″, is essentially zero within the experimental error. Near Tb, however, both χ′ and χ″ were found to be greatly enhanced, and χ′ decreases with increasing frequency following log(f ) dependence. A scaling method was applied for χ′(f,T) to determine the distribution of energy barriers and that of particle size. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362140
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  • 8
    Electronic Resource
    Electronic Resource
    Anisotropic magnetoresistance and planar Hall effect in magnetic metal-insulator composite films : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 5527-5529 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We studied anisotropic magnetoresistivity (AMR) and planar Hall effect of granular Ni-rich NiFe–SiO2 and Fe–SiO2 films for various metallic volume fraction. Planar Hall resistivity was found to be the same as the magnetoresistivity (MR) difference between the longitudinal and the transverse geometry. As metallic volume fraction decreases, we found that the MR evolves from the AMR domination in the metallic conduction region, through an intermediate conduction region with mixed AMR and negative MR behavior, to the isotropic negative MR in the tunneling conduction region. Plausible explanations to this complicated evolution are discussed. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364592
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  • 9
    Electronic Resource
    Electronic Resource
    Negative remanence in magnetic nanostructures : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6013-6015 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In nearly percolating magnetic granular (Ni,Fe)-SiO2 films, we observed negative remanence, or a negative remanent magnetization, upon removing the positively applied magnetic field to zero. We propose that there exist both superparamagnetic and ferromagnetic components due to different connectivity of magnetic nanometer scaled particles, as supported by the dark field transmission electron microscopy images. The magnetostatic interaction between them favors an opposite alignment. Moreover, the two-component hypothesis explains satisfactorily the dependencies of the negative remanence on temperature and magnetic volume fraction. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362137
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  • 10
    Electronic Resource
    Electronic Resource
    Observation of giant Hall effect in granular magnetic films : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6140-6142 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The Hall effect in granular co-sputtered ferromagnetic metal–insulator films was found to increase dramatically as the magnetic volume fraction decreases toward the metal–insulator transition. The saturated Hall resistivity is up to 160 μΩ cm at T=5 K, that is almost four orders of magnitude greater than that in a pure magnetic metal sample. Close to the metal–insulator transition, both magnetoresistivity and the saturated Hall resistivity decrease with increasing temperature. Correlations of the Hall resistivity with resistivity and magnetoresistivity are discussed. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362050
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