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  • 1
    Electronic Resource
    Electronic Resource
    Driven spin-wave dynamics in yttrium–iron–garnet films (abstract) : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5377-5377 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Yttrium–iron–garnet (YIG) is an important component used in filters and other microwave devices. In this work we investigate the behavior of driven magnetostatic wave modes in rectangular YIG films subject to an in-plane magnetic field. Patterned slotlines and coplanar waveguides are used to drive the film at separate spatial locations with microwave (2–4 GHz) excitations corresponding to the magnetostatic wave modes. For a single excitation with sufficient power above the Suhl instability, the transmitted power through the film displays periodic low-frequency (10 kHz) auto-oscillations. As the drive amplitude is increased, these oscillations may display period-doubling, intermittency, and high-dimensional behavior, including chaos. A second microwave drive applied to the sample excites additional spin-wave modes that interact with those arising from the original excitation. These interactions result in additional low-frequency components in the observed auto-oscillations. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362308
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  • 2
    Electronic Resource
    Electronic Resource
    The microwave surface impedance of granular high TC superconductors in dc magnetic fields: Its relationship to frequency dependence (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 4103-4108 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The surface impedance of bulk and thick film granular high temperature superconductors has been studied. The static magnetic field, temperature, and frequency dependence of the surface impedance have been analyzed in terms of the weakly coupled grain model. Accurate quantitative predictions of the frequency dependence of the surface resistance are made using this model. The model also quantitatively accounts for the negative magnetic field coefficient of the effective rf penetration depth. The rf penetration depth is a maximum when the ratio of penetration depth to skin depth is 0.930.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355989
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  • 3
    Electronic Resource
    Electronic Resource
    Characterizing chaos in magnetostatic modes : 35th Annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5727-5729 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The nonlinear behavior seen in ferromagnetic resonance experiments in yttrium iron garnet (YIG) has long proven difficult to model. Time series analysis techniques from nonlinear dynamics have been applied to characterize chaos seen in an experiment involving an YIG film. It is found that this characterization reveals possible shortcomings in some of the common models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347900
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  • 4
    Electronic Resource
    Electronic Resource
    Chaos in magnetostatic modes in an yttrium iron garnet film between 2 and 4 GHz (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5630-5632 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have studied chaos in spin waves in an yttrium iron garnet film between 2 and 4 GHz. We have used dimension and Lyapunov exponents to differentiate the chaos resulting from driving a volume magnetostatic mode or a surface magnetostatic mode.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345908
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  • 5
    Electronic Resource
    Electronic Resource
    Dynamics of transients in yttrium-iron-garnet (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Chaos 7 (1997), S. 803-809 
    Details
    ISSN: 1089-7682
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Yttrium-iron-garnet (YIG) is an important technological material used in microwave devices. In this paper we use dual microwave (1–4 GHz) drives to study the dynamical bifurcation behavior of magnetostatic and spin-wave modes in YIG spheres and rectangular films. The samples are placed in a dc magnetic field and driven by cw and pulse-modulated microwave excitations at magnetostatic mode frequencies. A second microwave drive applied to the sample excites additional spin-wave modes that can interact with those arising from the original excitation and thereby affect the transmission characteristics at the primary frequency. We find a significant decrease in transmission of the primary when the secondary frequency is tuned to approximately half that of the primary drive. This decrease is observed both in the steady state behavior and in the initial overshoot transient associated with pulse modulation of the primary excitation. Results such as these are often treated by extending linear theory to include higher order interaction terms. Herein we present a simple dynamical model that reproduces results that qualitatively resemble the experimental data. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.166280
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  • 6
    Electronic Resource
    Electronic Resource
    Magnetization and ferromagnetic resonance studies in implanted and crystal ion sliced bismuth-substituted yttrium iron garnet films (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 5217-5219 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Bismuth-substituted yttrium iron garnet (Bi-YIG) is the material of choice in the fabrication of optical isolators. Recently some of us have demonstrated an ion-implantation based technique for detaching single-crystal Bi-YIG films from their gadolinium gallium garnet growth substrates, and for their subsequent bonding onto semiconductor wafers. In this article we study the magnetic properties of bubble-type Bi-YIG films with large out-of-plane uniaxial anisotropy in various stages of the separation process. We find that the implantation reduces the perpendicular anisotropy field from approximately 1435 to 750 Oe as a result of increased residual strain. Annealing partially restores the anisotropy to 900 Oe depending on annealing conditions. Chemical etching of the implanted sample separates the Bi-YIG film from the substrate at the sacrificial layer. Upon detachment the perpendicular anisotropy of the sample is nearly fully restored to its original value. The 9 GHz ferromagnetic resonance (FMR) linewidth of these films is large (440–520 Oe) and is only weakly affected by the processing. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369948
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  • 7
    Electronic Resource
    Electronic Resource
    Magnetization and FMR studies of crystal-ion-sliced narrow linewidth gallium-doped yttrium iron garnet (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 6253-6255 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Recent interest in employing single-crystal yttrium iron garnet (YIG) films for miniaturized microwave integrated circuit applications has prompted us to study detaching liquid phase epitaxy (LPE) grown YIG films from their gadolinium gallium garnet (GGG) substrates via crystal ion slicing (CIS). We report studies of magnetization and ferromagnetic resonance (FMR) of narrow linewidth gallium-doped YIG (GaYIG) films in various stages of separation from their 〈111〉 oriented GGG substrates. All samples were diced from the same three-inch wafer of Y3Fe4.6Ga0.4O12 with 4πMeff of 1070 G and 9.45 GHz FMR linewidth of 0.4±0.1 Oe. The CIS separation process involved (1) implantation with helium ions, (2) flash annealing to remove surface damage, and (3) chemical etching to detach the YIG at the implantation damaged layer. The starting films were 10.8-μm thick. Separation occurred 7 to 8 μm from the front surface in the YIG. The implantation (5×1016 cm−2 dosage, 3.8 MeV bias) increased the uniaxial anisotropy of these films. A small cubic anisotropy (∼5 G 60° in-plane periodicity) persisted in both implanted and unimplanted samples. Upon implantation the FMR linewidth increased from 0.4 to 3±0.5 Oe. The detached samples have linewidths ranging from 1.7 to 2.5 Oe. The temperature dependence of the linewidths is roughly exponential decreasing as the temperature is lowered for the unprocessed sample, increasing with reduced temperature for all processed samples. Post-detachment annealing restores the FMR linewidth to 0.55±0.5 Oe. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373422
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  • 8
    Electronic Resource
    Electronic Resource
    Chaos and chaotic transients in yttrium iron garnet (invited) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5396-5400 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Long-lived chaotic transients are a prominent feature of the spin-wave behavior of spheres of yttrium iron garnet (YIG) being perpendicularly pumped in the region of the first-order Suhl instability. These transients may appear after a sudden increase in rf pumping power or during transitions between quasiperiodic auto-oscillations. The transients, which result from the collision of a chaotic attractor with the basins of attraction of multiple stable quasiperiodic attractors, vary in lifetime by more than six orders of magnitude, from milliseconds to hours, as a function of the rf driving field. The average lifetimes of these transients fit an extended Grebogi–Ott–Yorke scaling law. Roughening the surface of the YIG sphere drastically changes the behavior of these transients.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342380
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  • 9
    Electronic Resource
    Electronic Resource
    Electrical transport properties of thin epitaxially grown iron films on GaAs (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 4291-4293 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have determined the components of the magnetoresistance tensor through fifth order in the magnetic direction cosines for four epitaxially grown iron films with thicknesses between 200 and 60 A(ring) at 300, 77, and 4.2 K. We have also determined their magnetic anisotropy parameters from ferromagnetic resonance at 300 K. These phenomenological parameters provide an excellent description of the magnetic field dependence of the planar magnetoresistivity for electric current directed along the [001], [11¯0], and [11¯(2)1/2 ] directions and the applied fields necessary to produce spin flops.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340205
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  • 10
    Electronic Resource
    Electronic Resource
    Magnetostatic modes and chaos in yttrium iron garnet films (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 3197-3208 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nonlinear interactions in yttrium iron garnet cause complex, low-frequency signals seen during ferromagnetic-resonance experiments. Several methods from nonlinear dynamics have been used to measure quantities such as dimensions, Lyapunov exponents, and others, to characterize complex behavior that is measured by ferromagnetic resonance experiments. It is found that these quantities may be more useful in understanding the interactions in yttrium iron garnet than more commonly measured quantities such as oscillation frequency. Very simple numerical models are also used to suggest which quantities are most important in characterizing these spin-wave interactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349303
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