A Magnetometer Based on a Spin Wave Interferometer

ORAL

Abstract

We describe a magnetic field sensor based on a spin wave interferometer. Its sensing element consists of a magnetic cross junction with four micro-antennas fabricated at the edges. Two of these antennas are used for spin wave excitation while two other antennas are used for detection of the inductive voltage produced by the interfering spin waves. The sensitivity attains its maximum under the destructive interference condition. We report experimental data obtained for a micrometer scale Y3Fe2(FeO4)3 cross structure. The change of the inductive voltage near the destructive interference point exceeds 40 dB per 1 Oe. The phase of the output signal exhibits a π-phase shift within 1 Oe. The data are collected at room temperature. Taking into account the low thermal noise in ferrite structures, we estimate that the maximum sensitivity of the spin wave magnetometer may exceed attotesla.

*This was supported by the Spins and Heat in Nanoscale Electronic Systems (SHINES), an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences (BES) under Award # SC0012670. The work of G.M. Dudko, A.V. Kozhevnikov and Y.A. Filimonov is supported b

–

Presenters

  • Alexander Khitun

    • Electrical and Computer Engineering, University of California Riverside
    • University of California Riverside

Authors

  • Michael Balinskiy

    • Electrical and Computer Engineering, University of California Riverside
    • University of California Riverside

  • David Gutierrez

    • Electrical and Computer Engineering, University of California Riverside
    • University of California Riverside

  • Howard Chiang

    • Electrical and Computer Engineering, University of California Riverside
    • University of California Riverside

  • Alexander Kozhevnikov

    • Kotelnikov Institute of Radioengineering and Electronics of the Russian Academy of Sciences

  • Galina Dudko

    • Kotelnikov Institute of Radioengineering and Electronics of the Russian Academy of Sciences

  • Yuri Filimonov

    • Kotelnikov Institute of Radioengineering and Electronics of the Russian Academy of Sciences

  • Alexander Balandin

    • Electrical and Computer Engineering , University of California
    • Electrical and Computer Engineering, University of California Riverside
    • Electrical and computer Engineering, Univ of California - Riverside
    • Department of Electrical and Computer Engineering/Materials Science and Engineering Program, University of California, Riverside
    • Department of Electrical and Computer Engineering, University of California, Riverside
    • Electrical and Computer Engineering, University of California, Riverside
    • University of California Riverside

  • Alexander Khitun

    • Electrical and Computer Engineering, University of California Riverside
    • University of California Riverside