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A Magnetometer Based on a Spin Wave Interferometer.

M Balynsky1, D Gutierrez1, H Chiang1

  • 1Department of Electrical and Computer Engineering, University of California -Riverside, Riverside, California, 92521, USA.

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|September 16, 2017
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Summary
This summary is machine-generated.

This study introduces a novel magnetic field sensor utilizing a spin wave interferometer. This device achieves ultra-high sensitivity, potentially exceeding attotesla, by exploiting destructive interference in spin waves.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Spin waves are collective excitations in magnetic materials.
  • Interferometry is a technique that exploits wave interference to make precise measurements.
  • Magnetic field sensors are crucial for various scientific and technological applications.

Purpose of the Study:

  • To develop a highly sensitive magnetic field sensor.
  • To explore the use of spin wave interferometry for magnetic field detection.
  • To characterize the performance of a Y3Fe2(FeO4)3 based spin wave interferometer.

Main Methods:

  • Fabrication of a magnetic cross junction with micro-antennas.
  • Excitation and detection of spin waves using micro-antennas.
  • Measurement of inductive voltage and phase shifts under varying magnetic fields.

Main Results:

  • The spin wave interferometer demonstrates high sensitivity to external magnetic fields.
  • A change of over 40 dB per 1 Oe in inductive voltage was observed near destructive interference.
  • A π-phase shift was achieved within a 1 Oe field change.

Conclusions:

  • The developed spin wave interferometer is a promising platform for ultra-sensitive magnetic field sensing.
  • The device operates at room temperature and shows potential for attotesla-level sensitivity.
  • Further research into ferrite structures could lead to even more sensitive magnetic sensors.