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  • American Institute of Physics (AIP)  (6)
  • 1985-1989  (6)
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  • 1
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic properties of epitaxial iron films have been studied. The iron films were grown on {100} GaAs and GaInAs substrates. Both the magnitude of the anisotropy energies and direction of the easy axes were studied using a SQUID magnetometer. In particular, measurements were made of the magnetization in the plane of the film along the 〈100〉 and 〈110〉 directions. From these measurements the magnitude of the anisotropy energy and the direction of the easy axis were determined. Also measurements of the coercivity of the films were made using a magneto-optic Kerr effect system. These results are compared with those determined previously for iron films grown on GaAs.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3672-3672 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is now clear that both the atomic and magnetic properties of epitaxial Fe films can be controlled by the precise nature of the substrate which acts as the template for the growth. We have investigated the role of defects and strain arising from lattice mismatch on the growth and the magnetic properties of the Fe films. The films were grown by molecular-beam epitaxy (MBE) on three different well characterized surfaces: GaAs(100), In0.2Ga0.8As(100), and Fe(100). The first two surfaces were also prepared by MBE. This mole fraction of In was chosen to match the lattice constant of bulk α-Fe. The growth of the Fe film was characterized by using reflection high-energy electron diffraction (RHEED) and the results indicate that the morphology of the Fe films is smoother on the InGaAs surface than on the GaAs surface. Yet is is still much rougher than the growth on Fe(100) substrate. The magnetic properties were measured by using a SQUID magnetometer and coercivity values are comparable to that of the films grown on ZnSe.1
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  • 3
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3049-3051 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The non-spin-polarized mixed-basis self-consistent pseudopotential method has been used to investigate the electronic properties of hexagonal close packed Co1−xCrx alloys. For x=0.0, 0.25, and 0.5, total charge densities, effective charges, and band structures are reported. The effects of in-plane (a-axis) and c-axis stresses on the electronic properties have been investigated. The charge transfer from Cr to Co, which is about 0.04 electrons per Co/Cr bond, does not show large changes with stress. For x〈0.25, we can expect that the band structure of Co will not show significant changes with alloying.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Amorphous Fe-Ni-Zr alloys in the "as quenched'' and irradiated state have been studied with 57Fe Mössbauer spectroscopy and ac and dc susceptibility. Samples were irradiated by 14-MeV neutrons at room temperature to fluences of ≈1017 ns/cm2 corresponding to a dpa of 3×10−4 at the Lawrence Livermore National Laboratory RTNS-II facility. Two samples (Fe89.7Ni0.3Zr10 and Fe70Ni20Zr10) "as quenched'' and irradiated, have been studied between room temperature and ≈4 K. ac susceptibility shows reentrant magnetic behavior for both alloys. Temperature hysteresis (no applied fields) is observed initially in the Mössbauer spectra for both alloys, "as quenched'' and irradiated. It decreases and virtually disappears after a few thermal cycles between 20 K and room temperature. Relaxation effects are present in the magnetic hyperfine spectra of both alloys, "as quenched'' and irradiated. The usually assumed proportionality between the magnetic hyperfine splitting and the magnetization is probably not valid for these alloys.
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  • 5
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3274-3276 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A theoretical model is proposed to explain the magnetic properties of uncompensated CaGe:YIG with excess calcium. The model proposes that the excess uncompensated charge is localized at low temperatures on the tetrahedral site to produce an Fe4+ ion. At high temperatures, the charge is assumed to be delocalized and the magnetic behavior is similar to that of the charge-compensated YIG. Because of the strong ferromagnetic superexchange between the Fe3+ ion on the octahedral site and the Fe4+ on the tetrahedral site, the ground state of the spin on the Fe4+ site is proposed to be parallel to the octahedral site. Therefore, the theoretical model assumes the presence of three Ising-like magnetic sublattices: (a) a tetrahedral site Fe4+, (b) a tetrahedral site Fe3+, and (c) a octahedral site Fe3+. The magnetization, calculated in the molecular-field theory, shows a compensation point in accordance with the observation. The cubic anisotropy energies are calculated by considering the fourth-order terms in the spin Hamiltonian and using the molecular field on the Fe4+ site. A good agreement is achieved between the theoretical and experimental results.
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  • 6
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 4207-4209 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The domain wall oscillations have been investigated in the frequency range 10–150 MHz by using a magneto-optical spectrometer for the case of parallel stripe domains in the thin films of substituted YIG. The equations of motion are modified in a perturbation approach to include in-plane field and stray fields arising from the magnetic charges on the film surfaces. The inclusion of the stray fields makes the wall structure Bloch-like in the center and Néel-like close to the surface of the film. Under uniform excitation, the walls can flex and give rise to infinitely many resonance frequencies. The resonance frequencies and the wall profiles for different flexural modes are calculated by considering a small amplitude wall displacement about the equilibrium wall position. It is shown that the even modes are symmetric and odd modes are antisymmetric about the center of the film. Experimentally, three modes ν0, ν1, and ν2 have been observed as a function of the applied in-plane field. The field dependence of the ν0 is seen to be in very good agreement with the theory. For higher modes, a good qualitative agreement is observed. Unlike the rigid wall model, the present theory explains the finite values of the resonance frequencies for all values of an applied in-plane magnetic field up to the saturation fields.
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