Lecture image placeholder

Premium content

Access to this content requires a subscription. You must be a premium user to view this content.

Monthly subscription - $9.99Pay per view - $4.99Access through your institutionLogin with Underline account
Need help?
Contact us
Lecture placeholder background
VIDEO DOI: https://doi.org/10.48448/j8v1-f112

technical paper

MMM 2022

November 07, 2022

Minneapolis, United States

Evaluation of Coplanar Line Type Thin Film Magnetic Field Sensor with Narrow Slits.

In our previous work, we developed the highly sensitive thin film sensor and indicated the successful measurement of Magnetocardiogram signals without the magnetic shielding 1. But the sensitivity was poor around the ferromagnetic resonance frequency (in GHz bands) since the sensor had the severe reflection loss because of the impedance mismatching 2. In this research, we have improved the impedance matching of the sensor by employing the slits in the magnetic thin-film and evaluated the appropriate slit width. As shown in Fig. 1, the proposed sensor composes of CoNbZr, SrTiO, and Cu/Cr films. The CoNbZr film was annealed in rotating and static magnetic fields to induce transverse magnetic anisotropy. Several sensors having 6, 10, 26, 36, and 50 mm slit widths were fabricated and evaluated from the phase and the amplitude of the transmission coefficient (S21) measured by the network analyzer (Advantest Corp., R3767CG). In the measurement, the DC magnetic field of 0-20 Oe was applied to the longitudinal direction of the coplanar by a Helmholtz coil. The amplitude of S21 was improved about five times larger by employing the narrow slits. Although the changes of the amplitude and the phase by the magnetic field were small as the narrow slit, the maximum amplitude of S21 became large. Fig. 2 shows the sensor sensitivity versus the slit width. The sensitivity of the sensor was evaluated by assuming it to be proportional to the product of the phase and the amplitude gradients as the magnetic field and the carrier signal strength 3. The appropriate slit width was around 10 mm for the coplanar line type thin film magnetic field sensor and the sensitivity will enhance more than 10 times higher than the sensor without slits 1. However, it is expected that the sensor can get higher sensitivity by using amplitude modulation.


1 S. Yabukami et al, J. Magn. Soc. Jpn., Vol. 38, pp. 25-28 (2014) 2 T. Ishihara et al, Journal of Magnetic of Japan, vol. 6 (2022) 3 N. Horikoshi et al, Journal of Magnetic of Japan, vol. 29, pp. 472 (2005)


Transcript English (automatic)

Next from MMM 2022

Magnetism and Electron Spin Resonance (ESR) in Mo doped LaMnO3
technical paper

Magnetism and Electron Spin Resonance (ESR) in Mo doped LaMnO3

MMM 2022

Ramanathan MahendiranYong Heng Lee
Yong Heng Lee and 1 other author

07 November 2022

Stay up to date with the latest Underline news!

Select topic of interest (you can select more than one)


  • All Lectures
  • For Librarians
  • Resource Center
  • Free Trial
Underline Science, Inc.
1216 Broadway, 2nd Floor, New York, NY 10001, USA

© 2023 Underline - All rights reserved