High-frequency carrier type thin-film sensor using low-noise crystal oscillator

S. Yabukami; H. Mawatari; Y. Murayama; T. Ozawa; K. Ishiyama; K. I. Arai

doi:10.1109/TMAG.2004.828960

High-frequency carrier type thin-film sensor using low-noise crystal oscillator

S. Yabukami, H. Mawatari, Y. Murayama, T. Ozawa, K. Ishiyama, K. I. Arai

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

Abstract

We have developed a very sensitive high-frequency carrier-type magnetic field sensor based on the giant magneto-impedance effect available at lower frequencies. Our approach is to optimize the sensor structure so as to obtain high impedance. In addition, we optimize the carrier suppressing circuit using a low-noise crystal oscillator to reduce the phase noise of the lower offset frequency (under 1 kHz) as a carrier source. When a small ac magnetic field is applied to the sensor element, a very small AM signal can be detected using a carrier suppressing circuit with a low-noise crystal oscillator. A resolution of 1.7 × 10^-8 Oe/Hz^1/2 was obtained at 501 kHz. The detectable magnetic Held is limited by the thermal noise of room temperature. Resolutions of 1.5 × 10^-7 Oe/Hz^1/2 at 1 kHz and a resolution of 1.1 × 10^-6 Oe/Hz^1/2 at 110 Hz were demonstrated. The resolution was basically limited by the phase noise of the crystal oscillator.

Original language	English
Pages (from-to)	2670-2672
Number of pages	3
Journal	IEEE Transactions on Magnetics
Volume	40
Issue number	4 II
DOIs	https://doi.org/10.1109/TMAG.2004.828960
Publication status	Published - 2004 Jul

Keywords

Carrier suppression technique
Giant magneto impedance
High-frequency carrier-type sensor
Low frequency
Thin film

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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10.1109/TMAG.2004.828960

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title = "High-frequency carrier type thin-film sensor using low-noise crystal oscillator",

abstract = "We have developed a very sensitive high-frequency carrier-type magnetic field sensor based on the giant magneto-impedance effect available at lower frequencies. Our approach is to optimize the sensor structure so as to obtain high impedance. In addition, we optimize the carrier suppressing circuit using a low-noise crystal oscillator to reduce the phase noise of the lower offset frequency (under 1 kHz) as a carrier source. When a small ac magnetic field is applied to the sensor element, a very small AM signal can be detected using a carrier suppressing circuit with a low-noise crystal oscillator. A resolution of 1.7 × 10-8 Oe/Hz1/2 was obtained at 501 kHz. The detectable magnetic Held is limited by the thermal noise of room temperature. Resolutions of 1.5 × 10-7 Oe/Hz1/2 at 1 kHz and a resolution of 1.1 × 10-6 Oe/Hz1/2 at 110 Hz were demonstrated. The resolution was basically limited by the phase noise of the crystal oscillator.",

keywords = "Carrier suppression technique, Giant magneto impedance, High-frequency carrier-type sensor, Low frequency, Thin film",

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AU - Yabukami, S.

AU - Mawatari, H.

AU - Murayama, Y.

AU - Ozawa, T.

AU - Ishiyama, K.

AU - Arai, K. I.

PY - 2004/7

Y1 - 2004/7

N2 - We have developed a very sensitive high-frequency carrier-type magnetic field sensor based on the giant magneto-impedance effect available at lower frequencies. Our approach is to optimize the sensor structure so as to obtain high impedance. In addition, we optimize the carrier suppressing circuit using a low-noise crystal oscillator to reduce the phase noise of the lower offset frequency (under 1 kHz) as a carrier source. When a small ac magnetic field is applied to the sensor element, a very small AM signal can be detected using a carrier suppressing circuit with a low-noise crystal oscillator. A resolution of 1.7 × 10-8 Oe/Hz1/2 was obtained at 501 kHz. The detectable magnetic Held is limited by the thermal noise of room temperature. Resolutions of 1.5 × 10-7 Oe/Hz1/2 at 1 kHz and a resolution of 1.1 × 10-6 Oe/Hz1/2 at 110 Hz were demonstrated. The resolution was basically limited by the phase noise of the crystal oscillator.

AB - We have developed a very sensitive high-frequency carrier-type magnetic field sensor based on the giant magneto-impedance effect available at lower frequencies. Our approach is to optimize the sensor structure so as to obtain high impedance. In addition, we optimize the carrier suppressing circuit using a low-noise crystal oscillator to reduce the phase noise of the lower offset frequency (under 1 kHz) as a carrier source. When a small ac magnetic field is applied to the sensor element, a very small AM signal can be detected using a carrier suppressing circuit with a low-noise crystal oscillator. A resolution of 1.7 × 10-8 Oe/Hz1/2 was obtained at 501 kHz. The detectable magnetic Held is limited by the thermal noise of room temperature. Resolutions of 1.5 × 10-7 Oe/Hz1/2 at 1 kHz and a resolution of 1.1 × 10-6 Oe/Hz1/2 at 110 Hz were demonstrated. The resolution was basically limited by the phase noise of the crystal oscillator.

KW - Carrier suppression technique

KW - Giant magneto impedance

KW - High-frequency carrier-type sensor

KW - Low frequency

KW - Thin film

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High-frequency carrier type thin-film sensor using low-noise crystal oscillator

Abstract

Keywords

ASJC Scopus subject areas

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