A. P. Nosov, I. V. Gribov, N. A. Moskvina, A. V. Druzhinin, S. S. Dubinin

SENSORS OF LOW-FREQUENCY MAGNETIC FIELDS BASED ON FeGa-FeCoGa/METGLAS/QUARTZ STRUCTURES

The paper experimentally demonstrates the possibility of recording low-frequency (20 Hz to 10 kHz) magnetic fields in laminated structures of the composite magnetostrictive thin-film ferromagnet / piezoelectric / magnetostrictive ferromagnet type. Quartz single crystals are used as the piezoelectric material. The composite thin-film-based magnetostrictive ferromagnet is obtained by pulsed laser deposition of magnetostrictive Fe0.72Ga0.28 or Fe0.62Co0.19Ga0.19 thin-film layers on the surface of Metglas-type amorphous ribbons. The possibility of detecting both dc and ac magnetic fields in the frequency range from 20 Hz to 10 kHz by measuring the magnetoelectric voltage coefficient (MEVC) in laminated structures is demonstrated experimentally. The influence of the composition of the thin film layer on magnetic noise in the frequency range of 0.5 to 14 Hz is studied. It is shown that the deposition of thin films improves neither the maximum value of MEVC nor the coefficient of linearity at “high” (20 to 50 Oe) magnetic fields in the whole frequency range under study. However, the deposition of Fe0.62Co0.19Ga0.19 films enables us to achieve higher coefficients of linearity in the region of zero magnetic fields. Besides, the deposition of thin films increases magnetic noise. The obtained results can be useful in the development of sensors of both dc and ac magnetic fields for nondestructive systems and devices operated at elevated temperatures.

Acknowledgments: The work was performed under the state assignment from the Ministry of Education and Science of Russia, theme Function No. AAAA-A19-119012990095-0.

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