Anomalously high low-frequency effective permittivity in a system of metal nanoislands

Boltaev, A. P.; Pudonin, F. A.

doi:10.1134/s1063776108090173

Cited by 16 publications

(12 citation statements)

References 9 publications

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“…The plot of the collected data and a comparison to the theory is presented in Fig. 13 and shows good agreement, suggesting that these ultra-thin Pd films do not possess an "anomalously high" effective permittivity under these experimental conditions [8], [9].…”

Section: Ultra-thin-film Dispersionmentioning

confidence: 55%

“…Ultra-thin metal films have been reported to have an "anomalously high" effective permittivity between 10 5 and 10 8 [8], [9]. The dispersion characteristic of a 9 to 11 Å ultra-thin Pd film with a sheet resistance of 8.33 × 10 6 Ω/□ and relative permittivity ε F = 1ε 0 was entered into the acoustoelectric loss equation (1), from which saW propagation loss was plotted as a function of frequency (Fig.…”

Section: Ultra-thin Film Dispersionmentioning

confidence: 99%

“…Because of their high surface-to-volume ratio, discontinuous, ultrathin films are suitable for use as chemical sensors [6], [7]. These films have also been observed to have unique electrical properties, such as "anomalously high" effective permittivity [8], [9]. observations of the dispersion characteristics of these films on saW devices may help to characterize unique electrical properties, which may be useful in sensor applications.…”

mentioning

confidence: 96%

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In situ observation and measurement of the SAW thin-film acoustoelectric effect

Fisher

Malocha

2012

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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The thin-film acoustoelectric effect in SAW devices describes the interaction of electrical energy between a SAW in a piezoelectric medium and a thin film in the wave's propagation path. The real-time observation of the thin-film acoustoelectric interaction is useful in the design and characterization of SAW sensors (i.e., temperature, humidity, viscosity, voltage, current, Hall effects, etc.). An in situ test fixture was designed to be mechanically, thermally, and electrically stable. Data acquisition software and an electron beam evaporation system were configured for real-time thin-film characterization during film growth. Data have been observed for more than 20 SAW devices and over a wide range of frequencies (i.e., 62 MHz to 1 GHz). The results suggest that the use of the in situ procedure yielded good agreement between theoretical predictions and the measured data, which demonstrates a method for the characterization of a SAW H(2)-gas sensor in real-time.

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Section: Ultra-thin-film Dispersionmentioning

confidence: 55%

Section: Ultra-thin Film Dispersionmentioning

confidence: 99%

mentioning

confidence: 96%

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In situ observation and measurement of the SAW thin-film acoustoelectric effect

Fisher

Malocha

2012

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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“…The effects of a low rF resistivity and high effective permittivity on the aE response are complementary, because a decrease in resistivity shifts the dielectric relaxation frequency upward, whereas a high effective permittivity shifts the relaxation frequency downward. The saW-film interaction occurs at the micron and submicron level because of the saW wavelength and film morphology; thus it is not clear whether the rF resistivity and effective permittivity observed using the EM waves [36]- [39] will be the same when observed with a saW. These parameters change when an ultra-thin Pd film is exposed to hydrogen gas, and may dramatically alter the aE response of the saW.…”

Section: ) Pd Ultra-thin Film Reviewmentioning

confidence: 89%

Study of the acoustoelectric effect for SAW sensors

Fisher

Malocha

2010

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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Research has recently begun on the use of ultrathin films and nanoclusters as mechanisms for sensing of gases, liquids, etc., because the basic material parameters may change because of film morphology. As films of various materials are applied to the surface of SAW devices for sensors, the conductivity of the films may have a strong acoustoelectric effect, whether desired or not. The purpose of this paper is to reexamine the theory and predictions of the acoustoelectric effect for SAW interactions with thin conducting or semi-conducting films. The paper will summarize the theory and predict the effects of thin film conductivity on SAW velocity and propagation loss versus frequency and substrate material. The theory predicts regions of conductivity which result in extremely high propagation loss, and which also correspond to the mid-point between the open and short-circuit velocities. As an example of the verification and possible usefulness of the acoustoelectric effect, recent experimental results of palladium (Pd) thin films on a YZ LiNbO3 SAW delay line have shown large changes in propagation loss, depending on the Pd film thickness, exposure to hydrogen gas, or both. By proper design, a sensitive hydrogen leak detector SAW sensor can be designed.

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“…exhibit effects of giant magnetoresistance [9,10]. Further more, recent investigations of the electrical and physi cal properties of multilayer island films based on Co, W, and FeNi have revealed that these materials possess an anomalously high effective permittivity, which reaches values ε ~ 10 7 -10 8 [11].…”

Section: Introductionmentioning

confidence: 99%

Impedance spectra of thin permalloy films with a nanoisland structure

Belyaev

Drokin

2012

Phys. Solid State

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The behavior of the impedance spectra of island permalloy films prepared through vacuum evap oration onto optically polished glass ceramic substrates has been investigated in the frequency range from 0.0001 to 100 MHz. A resistor-capacitor model of the films has been developed and the model parameters, for which there is a good agreement with experimental data on the frequency dependences of the real and imaginary components of the impedance, have been determined. The specific features in the behavior of the electrical and physical characteristics with variations in the thickness of the sample and the gap between the measuring electrodes have been investigated. It has been found that the relative permittivity of the films under investigation reaches values ε ~ 10 7 -10 8 . The structural relaxation times have been calculated.

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Anomalously high low-frequency effective permittivity in a system of metal nanoislands

Cited by 16 publications

References 9 publications

In situ observation and measurement of the SAW thin-film acoustoelectric effect

In situ observation and measurement of the SAW thin-film acoustoelectric effect

Study of the acoustoelectric effect for SAW sensors

Impedance spectra of thin permalloy films with a nanoisland structure

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