A spin-wave magnetometer with a positive feedback

Balinskiy, M.; Chiang, H.; Kozhevnikov, A.; Filimonov, Y.; Balandin, A. A.; Khitun, A.

doi:10.1016/j.jmmm.2020.167046

Title: A spin-wave magnetometer with a positive feedback

Journal Article · Tue Jun 02 00:00:00 EDT 2020 · Journal of Magnetism and Magnetic Materials

DOI:https://doi.org/10.1016/j.jmmm.2020.167046· OSTI ID:1851727

Balinskiy, M. ^[1]; Chiang, H. ^[1]; Kozhevnikov, A. ^[2]; Filimonov, Y. ^[3]; Balandin, A. A. ^[1]; Khitun, A. ^[1]

Univ. of California, Riverside, CA (United States). Dept. of Electrical and Computer Engineering
Russian Academy of Sciences (RAS), Moscow (Russian Federation). Kotelnikov Inst. of Radio-Engineering and Electronics
Russian Academy of Sciences (RAS), Moscow (Russian Federation). Kotelnikov Inst. of Radio-Engineering and Electronics; Saratov State Univ. (Russian Federation)

In this work, we demonstrate experimentally the operation of a spin-wave magnetometer integrated into a circuit with a positive feedback. The circuit consists of the passive magnetic and active electric parts. The magnetic part includes a sensing element, which is a magnetic cross junction made of Y₃Fe₂(FeO₄)₃. The electric part includes a non-linear amplifier and a phase shifter. The electric and magnetic parts are connected via micrometer size antennae. Spin waves are excited by two of these antennae while the output inductive voltage produced by the interfering spin waves is detected by the third antenna. Spin waves propagating in the orthogonal arms of the cross can accumulate significantly different phase shifts, depending on the direction and the strength of the external magnetic field. The output inductive voltage reaches its maximum in the case of constructive spin wave interference. The positive feedback provides further signal amplification. It appears possible to enhance the response function, compared to the passive circuits without a feedback, by a factor of ×100 without an increase in the noise level. The experimental data show a prominent response to the external magnetic field variation, exceeding 5 x 10³V/T. The intrinsic noise spectral density of the device can be as low as 10^-16 V²/Hz. The estimated sensitivity of the prototype device is 2 x 10^-12T/√Hz at room temperature. We argue that spin-wave magnetometers can potentially be as sensitive as SQUIDs while operating at room temperature.

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Research Organization:: Univ. of California, Riverside, CA (United States)

Sponsoring Organization:: Russian Science Foundation; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012670; 17-19-01673

OSTI ID:: 1851727

Alternate ID(s):: OSTI ID: 1809524

Journal Information:: Journal of Magnetism and Magnetic Materials, Vol. 514, Issue C; ISSN 0304-8853

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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