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  • 1
    Electronic Resource
    Electronic Resource
    Quantitative vector magnetometry using generalized magneto-optical ellipsometry (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 4583-4585 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We recently developed the method of generalized magneto-optical ellipsometry (GME), which enabled us to achieve a complete magneto-optical characterization of a magnetic material, including the magnetization orientation. For the present study, we have modified our original setup to allow for measurements at arbitrary external fields including entire field scans. Consequently, GME can be used as a tool to perform vector magnetometry measurements. In this article, we present our first experimental results on polycrystalline Co films which demonstrate the feasibility of GME as a magneto-optical vector magnetometer. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370415
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  • 2
    Electronic Resource
    Electronic Resource
    Nonlinear magneto-optic measurement of flux propagation dynamics in thin Permalloy films (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 91 (2002), S. 1066-1073 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Time-resolved nonlinear optics are used to study the propagation of magnetic flux pulses in a 250 nm Permalloy film. The flux is generated in the film by coupling it to a coplanar waveguide structure driven with broadband voltage pulses. Flux pulses propagated in the film with a phase velocity of 4.2×105 m/s and a group velocity of 1.5×105 m/s. Both velocities are consistent with the predictions of Damon–Eshbach theory for magnetostatic surface waves with 200–300 μm wavelengths. Within 100 μm of the excitation source, flux pulses decayed monotonically but with no measurable delay. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1421040
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  • 3
    Electronic Resource
    Electronic Resource
    Studying the reversal mode of the magnetization vector versus applied field angle using generalized magneto-optical ellipsometry (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 5834-5836 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We used the technique of vector generalized magneto-optical ellipsometry to study the behavior of the magnetization vector of a 50 nm Co thin film as a function of external field magnitude and direction. We determined the relative contributions of magnetization rotation and domain formation to the reversal of M. The Co sample had a uniaxial in-plane anisotropy. When the angle between the applied field and the easy axis was greater than ∼40°, the reversal occurred primarily by rotation of the magnetization, accompanied by a small reduction of the magnitude of M. In this angular region, the field at which there is a large jump in the angle of M as a function of applied field angle followed a single domain coherent rotation model. However, at applied field angles less than 40° to the easy axis, a larger reduction in |M| occurred during the jump in the magnetization angle. The jump also occurred at fields much lower than those predicted by the coherent rotation model, indicating a reversal mode initiated by domain formation. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372538
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  • 4
    Electronic Resource
    Electronic Resource
    Layer-resolved magnetometry of a magnetic bilayer using the magneto-optical Kerr effect with varying angle of incidence (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 4818-4820 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We determined the hysteresis loop of each layer in a magnetic bilayer of NiFe–SiO2–CoFe using the magneto-optical Kerr effect. Our method utilizes the fact that varying the angle of incidence of the optical beam changes the magnitude and sign of the polarization rotation signal contributed by each layer to the total signal. The magneto-optical signal of each layer varies differently with the angle of incidence, enabling us to determine the hysteresis loop of each. We measured the hysteresis loop of the bilayer for a range of angles of incidence, and from these loops determined the magnetization of the individual layers. We found that the magnetization of the soft NiFe layer coupled strongly to the CoFe layer for SiO2 interlayer thicknesses of 〈2 nm. The NiFe loop shears with decreasing interlayer thickness, increases in coercivity, and develops a two-stage switching behavior at an interlayer thickness of 1 nm. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370492
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  • 5
    Electronic Resource
    Electronic Resource
    Measurement of the scattered light magneto-optical Kerr effect from plasmon-resonant Ag particles near a magnetic film : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 5689-5691 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magneto-optical Kerr effect (MOKE) of light scattered from plasmon-resonant Ag particles placed near a magnetic sample is investigated. Ag particles were deposited on sputtered NiFe films with an SiO2 spacer layer of known thickness. The MOKE signal in the scattered light was found to vary strongly with the observation angle. For s-polarized incident light, no MOKE rotation was found in the normal direction, and the rotation signal switched sign as the observation direction passes through the surface normal direction. Conversely, p-polarized incident light generated a nonzero MOKE signal in the normal direction. In general, the MOKE signal increased for decreasing spacer thickness, and in addition the angular distribution of the MOKE changed, for both s- and p-incident polarizations. Implications for MOKE near-field optical microscopy using plasmon-resonant Ag particles as probes are discussed. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364637
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  • 6
    Electronic Resource
    Electronic Resource
    Generalized magneto-optical ellipsometry (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 965-967 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A complete magneto-optical characterization of any material requires the measurement of both, the magneto-optical and the conventional optical constants. We have developed the method of generalized magneto-optical ellipsometry (GME), which enables us to determine these material constants simultaneously in a single setup. In addition, GME even allows the determination of the magnetization orientation. The experimental setup is very simple, using only two rotatable polarizers as polarization sensitive elements. Our experimental results for permalloy demonstrate the validity of our approach and the feasibility of GME as a practical measurement technique. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.119669
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