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  • Articles  (97)
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  • 1
    Electronic Resource
    Electronic Resource
    Assessment of local variations in the coercivity of magneto-optical media : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6838-6840 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Locally varying deposition conditions and substrate characteristics of magneto-optic media may alter the domain nucleation, growth, and collapse mechanisms of the film. The use of a static tester and basic image processing equipment permits qualitative observations of anomalous domain nucleation, growth, and collapse phenomena. We present example images for a Co/Pt sample and several TbFeCo films that depict symmetrical domain expansion and collapse, directional preference for domain wall motion, domain collapse from submicroscopic domain remnants, and anomalous domain nucleation and expansion as a function of position on the sample.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352453
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  • 2
    Electronic Resource
    Electronic Resource
    Measurements of the anomalous magnetoresistance effect in Co/Pt and Co/Pd multilayer films for magneto-optical data storage applications : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 4686-4688 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The anomalous magnetoresistance effect in compositionally modulated TM/TM films (Co/Pt and Co/Pd) has been investigated. Results of measurements on samples at room temperature as a function of the strength of the applied magnetic field are reported. For each sample three different configurations are investigated in which the direction of the applied field is (i) perpendicular to the plane of the film, (ii) in the plane of the film and parallel to the direction of the electric current, (iii) in the plane of the film and perpendicular to the direction of the current. During these measurements the extraordinary Hall effect and the magneto-optical Kerr effect have also been monitored. This additional information, together with the magnetization measurement results obtained from a vibrating sample magnetometer, are used to analyze the data and to explain some of their interesting features.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348297
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  • 3
    Electronic Resource
    Electronic Resource
    Spectral measurements of the magneto-optical Kerr rotation and ellipticity in the media of optical recording : 35TH ANNUAL CONFERENCE ON MAGNETISM AND MAGNETIC MATERIALS San Diego, California (USA) 29 Oct−1 Nov 1990 (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5091-5093 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Spectral measurements of Kerr rotation and ellipticity for TbFe and superlattice Co/Pt and Co/Pd samples are obtained by a novel technique. The results of measurements are accurate over a wavelength range of 350 to 1100 nm. The interference effect on the Kerr spectra of the TbFe samples are studied by applying the multilayer analysis program. The reflectivity and Kerr spectra of Co/Pt and Co/Pd superlattice samples are studied to understand the interference effect and the magneto-optic interactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348133
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  • 4
    Electronic Resource
    Electronic Resource
    Computation of electron-diffraction patterns in Lorentz electron microscopy of thin magnetic films (abstract) : 35TH annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5890-5890 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Lorentz electron microscopy is a powerful tool for high-resolution studies of magnetic structure in thin films.1–3 The physical mechanism that underlies all known modes of Lorentz microscopy is the interaction between the propagating electron wave and the magnetic vector potential field. For a given electron trajectory the interaction, commonly known as the Aharonov–Bohm effect, results in a phase delay directly proportional to the path integral of the vector potential.4 Lorentz microscopy is therefore a branch of phase-contrast microscopy whose various modes (e.g., Fresnel, Foucault, differential phase contrast, small-angle diffraction, electron interference, and holography) simply represent different designs for capturing the information contained in the phase of the beam after passage through the sample. This paper introduces a general technique for computing the phase imparted to the electron beam by a two-dimensional pattern of magnetization. The vector potential field for a thin film with arbitrary magnetization is calculated using fast Fourier transforms. This field is then used to compute the phase modulation of the electron beam. Calculated phase patterns and the corresponding Fresnel/Foucault intensity distributions for several magnetic configurations of practical interest (e.g., ripples, vortices, sinks, and sources) are presented.〈ks〉
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347859
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  • 5
    Electronic Resource
    Electronic Resource
    Coercivity mechanisms in magneto-optical recording media (abstract) : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5792-5792 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This paper is devoted to an explanation of why the coercivity is much lower than the macroscopic anisotropy field (Brown paradox). The effect of nanostructure on the nucleation coercivity Hnc and wall motion coercivity Hwc is investigated using connection machine simulations. The magneto-optical (MO) thin films with inhomogeneities are modeled by a patchy two-dimensional lattice. The patches have random shape and size; the anisotropy constant fluctuates randomly from patch to patch; the exchange strength is uniform within the patches, but fluctuates at the patch borders. We have simulated various nucleation and wall motion processes on more than a dozen patchy lattices, with the average patch size d ranging from 60 to 300 A(ring). In all cases the average domain wall width δ(approximately-equal-to)120 A(ring). Some of our results are the following: (i) As d increases, Hnc decreases fast for d〈δ, but slowly for d(approximately-greater-than)δ. (ii) Hnc decreases with decreasing exchange strength at the patch borders. (iii) Hwc in films of small patches (d≤δ) is greater than that in films of large patches (d(approximately-greater-than)δ). (iv) Hwc increases with decreasing exchange coupling at the patch borders. Our results show that the scale of inhomogeneity responsible for the low Hnc in MO thin films ranges from 100 to 200 A(ring). This work extends the previous work on nucleation1 and pinning2 mechanisms in several respects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353576
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  • 6
    Electronic Resource
    Electronic Resource
    Generic source of perpendicular anisotropy in amorphous rare earth-transition metal films: Analytical results : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 6314-6316 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We derive an analytical expression for the intrinsic perpendicular anisotropy density Ku produced by surface magnetic dipolar interactions in amorphous rare earth-transition metal thin films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349979
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  • 7
    Electronic Resource
    Electronic Resource
    Measurements of magnetoresistance in magneto-optical recording media (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 7067-7080 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetoresistance effect in compositionally modulated transition-metal/transition-metal films (Co/Pt and Co/Pd) and in amorphous binary rare-earth–transition-metal alloy films (TbFe) has been investigated. Results of measurements on several samples at room temperature as a function of the strength of the applied magnetic field are reported. For each sample three different configurations are investigated in which the direction of the applied field is (i) perpendicular to the plane of film, (ii) in the plane of the film and parallel to the direction of the electric current, (iii) in the plane of the film and perpendicular to the direction of the current. During these measurements the extraordinary Hall effect and the magneto-optic Kerr effect have also been monitored. This additional information, together with the magnetization measurement results obtained from a vibrating sample magnetometer, are used to analyze the data and to explain some of their interesting features.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347646
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  • 8
    Electronic Resource
    Electronic Resource
    Measurement of magnetic anisotropy constant for magneto-optical recording media: A comparison of several techniques (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 1368-1376 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Experimental data of the intrinsic perpendicular magnetic anisotropy energy constant Ku are presented for amorphous rare earth-transition metal (RE-TM) Tbx(FeCo)1−x and multilayered Co/Pt thin film samples. These data were independently measured using five techniques based on torque magnetometry, the extraordinary Hall effect, and the magneto-optic Kerr effect. In the Hall effect measurement, the external field was applied to the sample in three different ways: fixed at 45° from the film normal; rotating around the sample; and fixed along the in-plane direction. The results obtained with these techniques agree with each other for the Co/Pt samples. However, we do find systematic differences in the measured Ku for the Tbx(FeCo)1−x samples. For example, Ku given by the Hall effect and Kerr effect is always larger (by up to a factor of 3) than that given by torque technique. Another interesting fact is that Ku given by the Hall effect technique drops as x approaches the compensation point xc in the TM-dominant case, but increases as x approaches xc in the RE-dominant case. These experimental results are explained by taking into account the canting between RE and TM subnetworks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353256
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  • 9
    Electronic Resource
    Electronic Resource
    Effect of canting on the measured magnetic anisotropy constant for magneto-optical recording media (abstract) : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5794-5794 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Experimental data of the intrinsic perpendicular magnetic anisotropy energy constant Ku are presented for amorphous rare-earth–transition metal (RE–TM) Tbx(FeCo)1−x and multilayered Co/Pt thin film samples. These data were independently measured using five techniques based on torque magnetometry, the extraordinary Hall effect, and the magneto-optic Kerr effect. In the Hall effect measurement, the external field was applied to the sample in three different ways: fixed at 45° from the film normal; rotating around the sample; and fixed along the in-plane direction. The results obtained with these techniques agree with each other for the Co/Pt samples. However, we do find systematic differences in the measured Ku for the Tbx(FeCo)1−x samples. For example, Ku given by the Hall effect and Kerr effect is always larger (by up to a factor of 3) than that given by torque technique. Another interesting fact is that Ku given by the Hall effect technique drops as x approaches the compensation point xc in the TM-dominant case, but increases as x approaches xc in the RE-dominant case. These experimental results are explained by taking into account the canting between RE and TM subnetworks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353578
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  • 10
    Electronic Resource
    Electronic Resource
    Measurement of anisotropy energy for magneto-optical media (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 813-820 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A technique is proposed for measuring the anisotropy energy of magneto-optical media. the technique consists of rotating a sample in a fixed external magnetic field and monitoring the extraordinary Hall effect signal of the sample. From the Hall effect signal, the angle of rotation of the sample, and the saturation magnetization of the sample (which is measured separately by a vibrating sample magnetometer), we obtain the anisotropy energy as a function of the deviation of magnetization from the easy axis. The technique is applied to multilayered Co/Pd and Co/Pt films as well as to amorphous rare-earth transition metal TbFeCo alloy films. The anisotropy constants thus obtained are compared with those obtained using other techniques such as torque magnetometry and Hall effect (or Kerr effect) measurements with applied field in the plane of the sample.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351299
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