Active magnetostatic wave delay line

Fetisov, Y. K.; Kaboš, Pavel; Patton, Carl E.

doi:10.1109/20.650254

Cited by 39 publications

(20 citation statements)

References 18 publications

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“…It has been predicted theoretically that temperature gradients can create a thermal spin-transfer torque [23][24][25], but so far there is scarce experimental evidence of this effect [26]. Spin waves with very low wave numbers, called magnetostatic waves, propagating in thin films of ferromagnetic materials were extensively studied in the 1970s and 1980s motivated by their interesting physical properties and potential applications in microwave signal processing devices [27,28]. Their main advantage over other means such as elastic waves is the control of their characteristics by the intensity of the applied static field.…”

mentioning

confidence: 99%

“…For this reason, considerable effort was devoted to finding ways to amplify spin waves with microwave frequencies. Parametric pumping in YIG with an independent microwave source [29], amplification through the interaction between spin waves and charge carriers [30], and active feedback loops [27] have not proved to be of practical application. In this Letter, we show that spinwave packets propagating along films of the very low-loss ferrimagnetic insulator YIG can be amplified by thermal gradients applied across the film thickness.…”

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confidence: 99%

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Amplification of Spin Waves by Thermal Spin-Transfer Torque

2011

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We observe amplification of spin-wave packets propagating along a film of single-crystal yttrium iron garnet subject to a transverse temperature gradient. The spin waves are excited and detected with standard techniques used in magnetostatic microwave delay lines in the 1-2 GHz frequency range. The amplification is attributed to the action of a thermal spin-transfer torque acting on the magnetization that opposes the relaxation and which is created by spin currents generated through the spin-Seebeck effect. The experimental data are interpreted with a spin-wave model that gives an amplification gain in very good agreement with the data.

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confidence: 99%

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Amplification of Spin Waves by Thermal Spin-Transfer Torque

2011

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“…They also provide the base for ferrite thin-film isolators [2] and for a variety of active devices -oscillators [1], active filters [3] and active delay lines [4]. Characteristics of MSW delay lines significantly depend on the reflection of waves from edges of a ferrite film, which causes passband ripples in frequency responces.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Magnetostatic Wave Delay Lines with Side Coupling Between Transducers and Ferrite Film

Zagriadski

Choi

Kim

2002

32nd European Microwave Conference, 2002

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The paper presents a new analytical method for solving electrodynamic problems of the excitation of waves in semi-infinite ferrite waveguides magnetized in an arbitrary direction by a uniform or transversely nonuniform field. Edge effects at the end of the waveguide caused by static demagnetizing are taken into account. The solution is derived from the linearized Landau-Lifshits equation using an orthogonality condition for eigenwaves of a magnetization.Applications of the theory are demonstrated for modeling and numerical calculations of frequency responses of magnetostatic wave delay lines with the side coupling of stripline transducers to a ferrite film. The optimum position of transducers, which provides the minimum insertion loss of delay lines, is determined. It is proved that a side coupling scheme enables to obtain lower loss of delay lines, then other methods usually used. Results of the theory can be also applied for modeling of phased antenna arrays using ferrite waveguides.

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“…The result revealed that an epitaxial growth of Ge film was attained on Si by PLA using a large number of molten droplets [5]. On the other hand, yttrium iron garnet (YIG) is known to be an excellent material for microwave applications, for instance, delay lines [6], filters [7], resonators [8], S/N-enhancers [9], etc. We presented the first report on the preparation of garnet films by PLA using ArF excimer laser [10].…”

Section: Introductionmentioning

confidence: 99%

LPE-like growth of YIG ferrimagnetic thin films by pulsed laser ablation with molten droplets

Morimoto

Matsuo

Minamikawa

et al. 1999

Applied Physics A: Materials Science & Processing

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Yttrium iron garnet (YIG) films were grown by pulsed laser ablation (PLA) on (111) Gadolinium Gallium Garnet (GGG) substrates. The second harmonic of YAG laser (532 nm) with a high laser fluence was employed for producing YIG droplets efficiently. It was found that YIG films prepared at RT substrates have a large number of solidified droplets with various sizes. Highly oriented YIG crystals were grown on the (111) GGG substrate heated at 860 °C by PLA using a large number of molten droplets, suggesting an LPE-like growth. This YIG film shows a small ferrimagnetic resonance linewidth of 7.5 Oe. This value is quite small among films prepared by vapor-phase-epitaxy techniques.

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Active magnetostatic wave delay line

Cited by 39 publications

References 18 publications

Amplification of Spin Waves by Thermal Spin-Transfer Torque

Amplification of Spin Waves by Thermal Spin-Transfer Torque

Modeling of Magnetostatic Wave Delay Lines with Side Coupling Between Transducers and Ferrite Film

LPE-like growth of YIG ferrimagnetic thin films by pulsed laser ablation with molten droplets

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