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  • 1
    Electronic Resource
    Electronic Resource
    Magnetically tunable sound velocity in iron borate (1980)
    Springer
    Applied physics 23 (1980), S. 195-198 
    Details
    ISSN: 1432-0630
    Keywords: 75.80+q ; 62.20 Dc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The weak ferromagnet FeBO3 exhibits a strong dependence of the transverse sound velocity on the external magnetic field. This dependence has been measured for phonons up to the GHz region. The results can be explained satisfactorily by the interaction of the phonon and magnon dispersion branches.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00899718
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  • 2
    Electronic Resource
    Electronic Resource
    Determination of the ferrimagnetic precession cone of in-plane magnetized garnet films using optical modulation technique (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 3977-3981 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic garnet films of composition (A, Bi)3(Fe, B)5 O12 are grown by liquid phase epitaxy on [111] oriented substrates of Gd3 Ga5 O12, where A=yttrium or lutetium and B=aluminum or gallium. The ferrimagnetic resonance (FMR) of in-plane magnetized films is studied by analyzing the modulation of light, which passes the film parallel to the film normal. Modulation efficiencies up to 1.8% at 2.9 GHz are observed at a wavelength of 0.633 μm. From the measured modulation intensities the precession angles of the FMR are derived. The dependence of the precession cone on the excitation frequency or on the external induction shows a foldover effect which, however, is smaller than for the FMR of perpendicularly magnetized films. Maximum precession angles up to 14° are achieved and the experiments indicate that saturation occurs. Light modulation is also observed at the first harmonic frequency, but the intensity is about 300 times weaker than at the fundamental frequency. ©1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363372
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  • 3
    Electronic Resource
    Electronic Resource
    Enhancement of the nonreciprocal magneto-optic effect of TM modes using iron garnet double layers with opposite Faraday rotation (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 2902-2905 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Garnet films of composition Lu3−xBixFe5−yGayO12 are grown by liquid-phase epitaxy on [111]-oriented substrates of gadolinium gallium garnet. Faraday rotation and saturation magnetization are measured as a function of substitution levels, which range up to x=1.4 and y=1.8, respectively. Nonreciprocal propagation of the TM0 is studied at a wavelength of 1.3 μm. It is shown that the difference between forward and backward propagation constants can be optimized using double layers with opposite sign of the Faraday rotation. Agreement between experiments and calculations is excellent. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359516
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  • 4
    Electronic Resource
    Electronic Resource
    Dynamic conversion of optical modes in magnetic garnet films induced by resonances of periodic stripe domains (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 3272-3278 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic garnet films of composition (Y,Bi)3(Fe,Al)5O12 are grown by liquid phase epitaxy on [111] oriented substrates of Gd3Ga5O12. They support periodic lattices of parallel stripe domains. A simple strip antenna is used to excite the domain wall resonance and the two branches of the domain resonance in the frequency range up to 5 GHz. The resonance frequencies and the dynamic components of the magnetization are calculated using a hybridization model. Good agreement between calculated and measured resonance frequencies is obtained if the quality factor of the film is larger than 0.6. Optical modes are coupled into the waveguiding film. The excited domain resonances cause dynamic conversion of transverse electric and transverse magnetic modes by the Faraday and the Cotton–Mouton effects. Mode coupling and conversion are calculated by the perturbation theory. The dynamic conversion efficiencies are measured at the fundamental and the first harmonic frequency and at zero diffraction order as a function of the static induction applied in the film plane parallel to the stripes. Conversion efficiencies up to 18% are achieved at a frequency of 2.8 GHz. From the experimental data the precession angles are derived.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357448
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  • 5
    Electronic Resource
    Electronic Resource
    Influence of growth conditions and annealing parameters on the near-infrared optical absorption of epitaxial magnetic garnet films (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 436-440 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Several series of epitaxial films of nominal pure and bismuth-, aluminum-substituted yttrium iron garnet are grown on [111]-oriented paramagnetic substrates from PbO-fluxed melts. The growth rate is varied systematically by changing the supercooling. The optical absorption at a wavelength of 1330 nm and the concentrations of the impurities Pb2+, Pb4+, Pt4+, Si4+, and Ca2+ are measured. The absorption shows a minimum at a certain growth rate vmin, which increases linearly with the saturation temperature of the melt. The minimum of the absorption constant reaches values below 0.3 cm−1. The as-grown films contain a surplus of four-valent impurities, the minimum concentration of which correlates with the minimum of the optical absorption. The absorption of samples with growth rates higher than vmin can be reduced considerably by annealing in hydrogen atmosphere at 430 °C for a few minutes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350674
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  • 6
    Electronic Resource
    Electronic Resource
    Chaos in magnetic garnet thin films (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 4157-4159 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Ferromagnetic resonance in thin magnetic garnet films has been studied at excitation frequencies of 10 GHz and from room temperature to 4.2 K. Powers sufficient to drive the magnetization to large precession angles have been studied. Second-order Suhl instabilities of the main resonance have been observed as an onset of auto-oscillations of the magnetization. These oscillations include regular and irregular oscillations, very noisy collective oscillations, as well as spiking. They have been observed in real time and by spectral analysis. In pure yttrium iron garnet (YIG) films the oscillations have been observed in the frequency range from 0.5 to 2 MHz at 300 and 4.2 K. In going from 300 to 4.2 K the threshold power level pth in YIG films is lowered by three orders of magnitude, while the frequency of the regular oscillations are nearly independent of temperature. If pth is connected to the intrinsic damping parameter γ, then γ is temperature dependent, which is in fair agreement with the large number of narrow resonance features observed in the films. Preliminary simulations using a model extending the S theory of Zakharov and Nakamura for large precession angles give time evolutions that are qualitatively similar to the experimental observations. Regular and weekly irregular oscillations are found for one spin-wave mode coupled to a linear resonance circuit, i.e., a phonon mode. More irregularity is found for two coupled spin-wave modes excited to large precession angles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340525
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  • 7
    Electronic Resource
    Electronic Resource
    Dynamical conversion of optical modes in garnet films induced by ferrimagnetic resonance (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 648-652 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is demonstrated that ferrimagnetic resonance can be applied to induce a dynamical conversion of optical modes in a magnetic garnet film. The fundamental and first-harmonic Fourier components of the converted mode are measured as a function of frequency and bias field; a dynamical conversion efficiency of 2% is obtained. The amplitude of the first harmonic depends very critically on the orientation of the magnetization with respect to the film normal. The results are confirmed by calculations on the basis of Faraday rotation and Cotton–Mouton effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339794
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  • 8
    Electronic Resource
    Electronic Resource
    Ferrimagnetic resonance in garnet films at large precession angles (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 4839-4843 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Perpendicular ferrimagnetic resonance in (111) oriented epitaxial garnet films is excited by strong rf drive fields causing large foldover effects. The precession angle of the magnetization is derived from the measured change of Faraday rotation of linearly polarized light passing through the films. Precession angles of over 60° have been observed. Measurements of the steady-state precession angles are in good agreement with calculations on the basis of Gilbert equations. The transient behavior of the precession, however, is slower than calculated. Conditions to achieve large precession angles are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338988
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  • 9
    Electronic Resource
    Electronic Resource
    Experimental investigation of the nonreciprocal phase shift of a transverse electric mode in a magneto-optic rib waveguide (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 2918-2920 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic garnet films of composition (Nd,Lu,Bi)3(Fe,Al,Ga)5O12 are grown by liquid-phase epitaxy on [111] oriented substrates of gadolinium gallium garnet. They have positive uniaxial anisoptropy and support lattices of parallel stripe domains. A monomode optical rib waveguide is prepared by photolithography and ion-beam etching parallel to the (112¯) direction, which is the preferred direction of the stripe domains. A magnetic domain pattern can be created such that a domain wall is located at the rib center while the adjacent walls stick to the flanks of the rib. At a wavelength of 1.3 μm a nonreciprocal phase shift of the guided fundamental transverse electric mode is observed. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.123965
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  • 10
    Electronic Resource
    Electronic Resource
    Nonreciprocal phase shift of TE modes induced by a compensation wall in a magneto–optic rib waveguide (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 4292-4294 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Garnet films of composition (Gd, Bi)3(Fe, Ga)5O12 are grown by liquid–phase epitaxy on (111) oriented substrates of gadolinium gallium garnet. The films are close to compensation. Using laser annealing straight vertical compensation walls (CW) are generated. Monomode rib waveguides are fabricated by ion beam etching so that a CW is located close to a rib center. The CW induces a nonreciprocal phase shift of the TE0 mode. The dependence of this phase shift on the position of the CW within the rib is calculated. Experimentally a phase shift of 0.7 cm−1 at 1.3 μm wavelength is observed. The deviation from the theoretical value is discussed. Such waveguides are essential to realize polarization–independent optical isolators. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1428633
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