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  • 1
    Electronic Resource
    Electronic Resource
    Dynamic control of instability thresholds in yttrium-iron-garnet : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 5734-5736 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Yttrium-iron-garnet (YIG) is an important material used in microwave limiters and other devices. In this work, we use dual microwave (1–4 GHz) drives to study the 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. For both films and spheres, we observe 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. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364652
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Dual driving of magnetostatic modes in yttrium–iron–garnet film experiments (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 1878-1882 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We study experimentally the behavior of magnetostatic wave modes in a rectangular yttrium–iron–garnet film placed in an in-plane magnetic field and subject to multiple drive excitations. Patterned slotlines and coplanar waveguides are used to drive the film with microwave (2–4 GHz) excitations corresponding to magnetostatic wave modes. For a single drive, we observe linear transmission at low drive powers and saturation above the Suhl instability. For sufficiently large powers above the instability, the transmitted power through the film displays periodic low-frequency (kHz) auto-oscillations. A second microwave drive applied to the sample is used to excite additional spin-wave modes that interact with those arising from the original excitation. Such dual-drive experiments can probe the nature of spin-wave mode interactions at high amplitudes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363001
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    Paper (German National Licenses)
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  • 3
    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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    Paper (German National Licenses)
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  • 4
    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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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Cryogenic field-effect transistor with single electronic charge sensitivity (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 631-633 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have fabricated matched pairs of cryogenic field-effect transistors with input charge sensitivity qn=0.01 e/(square root of)Hz at T=1.3 K, low input capacitance 0.4 pF, and extremely high input resistance in excess of 1015 Ω. Low leakage permits dc charge-coupled operation for times up to ∼103 s. The channel noise is characterized by a flat spectrum at high frequencies, and 1/f noise below a corner frequency fc〈1 kHz. These devices can resolve charge differences as small as qn(square root of)fc=0.4e.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.111072
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    Paper (German National Licenses)
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