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15 May 2003

Volume 93, Issue 10, pp. 5855-8792

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Phase control of nonadiabatic parametric amplification of spin wave packets

A. A. Serga, S. O. Demokritov, B. Hillebrands, Seong-Gi Min, and A. N. Slavin

J. Appl. Phys. 93, 8585 (2003); http://dx.doi.org/10.1063/1.1557855 (3 pages) | Cited 2 times

Online Publication Date: 9 May 2003

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The influence of the phase shift between the signal and pumping wave on the process of parametric amplification of microwave spin wave pulses has been examined. The experiment was specifically made in the nonadiabatic regime, where the pumping field is strongly localized in a region on the order of the spin wave carrier wavelength. In this regime all previous experiments exhibited a strong random modulation (beating) of the amplified output signal. For a fixed phase shift between the signal and the pumping carrier waves the output signal was found to be stable, and no beating was observed. The amplitude of the amplified output pulse varies from the maximum value (corresponding to the maximum gain factor of 15 dB) to the minimum value (corresponding to almost no gain) when the phase shift between signal and pumping wave is changed. The measured phase interval between two consecutive minima in the phase dependence of the output power is equal to π. © 2003 American Institute of Physics.
Show PACS
75.30.Ds Spin waves
75.70.Ak Magnetic properties of monolayers and thin films
75.50.Gg Ferrimagnetics
76.50.+g Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance
75.40.Gb Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.)

FEM analysis on the effects of soft magnetic film as a noise suppressor at GHz range

Ki Hyeon Kim, Shinji Ikeda, Masahiro Yamaguchi, and Ken-Ichi Arai

J. Appl. Phys. 93, 8588 (2003); http://dx.doi.org/10.1063/1.1557766 (3 pages) | Cited 6 times

Online Publication Date: 9 May 2003

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To investigate the rf electromagnetic noise attenuation properties by soft magnetic films, the finite element method is applied to analyze electromagnetic field and loss generation in a coplanar transmission line with soft magnetic thin film at GHz range. The coplanar transmission line is with the total width of 400 μm and 50 μm width of signal line, 3 μm thickness, respectively, and has 50 Ω characteristic impedance. The change of the magnetic field distribution, the induced surface current density on the coplanar transmission line and hence the rf noise suppression by magnetic films are significant as a function of the magnetic film width/slit width (10/3, 20/3, and 50/3 μm) and magnetic film thickness (0.1, 0.3, 0.5, and 1 μm). © 2003 American Institute of Physics.
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85.70.Ay Magnetic device characterization, design, and modeling
84.40.Az Waveguides, transmission lines, striplines
02.70.Dh Finite-element and Galerkin methods

Iron and Permalloy based magnetic monolithic tunable microwave devices

Bijoy Kuanr, L. Malkinski, R. E. Camley, Z. Celinski, and P. Kabos

J. Appl. Phys. 93, 8591 (2003); http://dx.doi.org/10.1063/1.1557856 (3 pages) | Cited 20 times

Online Publication Date: 9 May 2003

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We fabricated a series of magnetic monolithic tunable microwave notch-filters and phase shifters. In contrast to previous work with molecular beam epitaxy grown metallic ferromagnets, our devices were created by magnetron sputtering. Single crystal GaAs (001) was used as a substrate. Iron and Permalloy were used as magnetic materials in a coplanar waveguide geometry. The transmission characteristics of the filters were observed to depend on substrate quality, film deposition parameters (Argon pressure, growth rate, power, etc.), and grain size. In addition we observed a substantial increase in the resonance frequency for the Fe based notch-filters. This increase in the resonance frequency is due to a growth-induced uniaxial anisotropy field of 40 kA/m in the Fe films. This is an unexpected and important result especially because the observed anisotropy is growth and not field induced. The resonance frequency shifted from 9.3 GHz at zero applied magnetic field to 15 GHz for an applied static magnetic field as low as 72 kA/m (0.9 kOe). The Fe based notch filter attenuation was greater than 35 dB/cm over the whole applied field range at the resonance condition. The phase shift of the Fe structures was up to 100°/cm at 8 GHz. The Permalloy based filters show, over the same magnetic field range, a shift in the resonance frequency from 2 to 9 GHz. The attenuation of the Permalloy filters at resonance (6 dB/cm) is substantially lower than in the Fe based filters. © 2003 American Institute of Physics.
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85.70.Kh Magnetic thin film devices: magnetic heads (magnetoresistive, inductive, etc.); domain-motion devices, etc.
75.70.Ak Magnetic properties of monolayers and thin films
75.50.Bb Fe and its alloys
84.40.Dc Microwave circuits
84.30.Vn Filters
84.40.Az Waveguides, transmission lines, striplines
75.30.Gw Magnetic anisotropy
81.15.Cd Deposition by sputtering

Microwave signal processing using dipole-exchange spin waves

Yu. V. Kobljanskyj, G. A. Melkov, V. S. Tiberkevich, V. I. Vasyuchka, and A. N. Slavin

J. Appl. Phys. 93, 8594 (2003); http://dx.doi.org/10.1063/1.1557857 (3 pages) | Cited 5 times

Online Publication Date: 9 May 2003

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A microwave signal processor using short (wave number k∼104 cm−1) phase-conjugated dipole-exchange spin waves (DESWs) propagating in yttrium–iron–garnet films has been developed. A DESW pulse having low group velocity (νg∼103 cm/s) and low relaxation parameter (effective linewidth ΔH=0.2 Oe) was excited by a narrow (W=10 μm) strip-line transducer, experienced wave front reversal in a parametric interaction with a double-frequency pumping field created by a dielectric resonator, and was received again at the input transducer. As a result, a controlled delay of an input microwave pulse of more than 1 μs with insertion loss of 40 dB/μs was achieved. © 2003 American Institute of Physics.
Show PACS
75.30.Ds Spin waves
85.70.Kh Magnetic thin film devices: magnetic heads (magnetoresistive, inductive, etc.); domain-motion devices, etc.
76.50.+g Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance
75.70.Ak Magnetic properties of monolayers and thin films
75.40.Gb Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.)
75.30.Et Exchange and superexchange interactions
84.40.Dc Microwave circuits
75.50.Gg Ferrimagnetics

Microwave and magnetic properties of barium hexaferrite films having the c-axis in the film plane by liquid phase epitaxy technique

S. D. Yoon and C. Vittoria

J. Appl. Phys. 93, 8597 (2003); http://dx.doi.org/10.1063/1.1557791 (3 pages) | Cited 16 times

Online Publication Date: 9 May 2003

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We report the growth of thick barium hexaferrite (BaFe12O19,BaM) films on m-planes ([1math00] or [10math0]) sapphire (Al2O3) substrates by the liquid phase epitaxy deposition technique. The procedure entailed the deposition of seed layers of BaFe12O19 onto the substrate by the pulsed laser ablation deposition and then dipping the substrate into a molten flux for 2 h. The total thickness ranged from 60 μm to 200 μm. The vibrating sample magnetometer (VSM) measurement data showed that the film exhibited magnetic uniaxial anisotropy axis in the film plane. The coercive field was relatively small, range of Hc was from 0.007 kOe to 0.08 kOe, and the saturation magnetization (4πMs)≅4.42 kG. The ferrimagnetic resonance (FMR) linewidth (ΔH) at 59.9 GHz was ∼0.08 kOe. This value of ΔH should be contrasted with previous FMR linewidth measurement of films deposited by the PLD technique which showed a ΔH of ∼1.20 kOe. © 2003 American Institute of Physics.
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81.15.Lm Liquid phase epitaxy; deposition from liquid phases (melts, solutions, and surface layers on liquids)
75.70.Ak Magnetic properties of monolayers and thin films
68.55.-a Thin film structure and morphology
75.50.Gg Ferrimagnetics
76.50.+g Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.30.Gw Magnetic anisotropy
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