Journal article Open Access

Low-frequency magnetic sensing by magnetoelectric metglas/bidomain LiNbO3 long bars

Andrei V Turutin; João V Vidal; Ilya V Kubasov; Alexander M Kislyuk; Mikhail D Malinkovich; Yurii N Parkhomenko; Svetlana P Kobeleva; Andrei L Kholkin; Nikolai A Sobolev


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    "title": "Low-frequency magnetic sensing by magnetoelectric metglas/bidomain LiNbO3 long bars", 
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    "keywords": [
      "Magnetic sensors, lithium niobate, bidomain crystals, magnetoelectric effect, cantilever, low frequency"
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    "publication_date": "2018-04-30", 
    "creators": [
      {
        "orcid": "0000-0003-1090-3441", 
        "affiliation": "National University of Science and Technology MISiS, Leninsky av. 4, Moscow 119049, Russia & Department of Physics and I3N, University of Aveiro, 3810-193 Aveiro, Portugal", 
        "name": "Andrei V Turutin"
      }, 
      {
        "affiliation": "Department of Physics and CICECO, Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, Portugal", 
        "name": "Jo\u00e3o V Vidal"
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      {
        "affiliation": "National University of Science and Technology MISiS, Leninsky av. 4, Moscow 119049, Russia", 
        "name": "Ilya V Kubasov"
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        "affiliation": "National University of Science and Technology MISiS, Leninsky av. 4, Moscow 119049, Russia", 
        "name": "Alexander M Kislyuk"
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        "affiliation": "National University of Science and Technology MISiS, Leninsky av. 4, Moscow 119049, Russia", 
        "name": "Mikhail D Malinkovich"
      }, 
      {
        "affiliation": "National University of Science and Technology MISiS, Leninsky av. 4, Moscow 119049, Russia", 
        "name": "Yurii N Parkhomenko"
      }, 
      {
        "affiliation": "National University of Science and Technology MISiS, Leninsky av. 4, Moscow 119049, Russia", 
        "name": "Svetlana P Kobeleva"
      }, 
      {
        "affiliation": "Department of Physics and CICECO, Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, Portugal & ITMO University, St. Petersburg 197101, Russia", 
        "name": "Andrei L Kholkin"
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      {
        "orcid": "0000-0002-9420-8130", 
        "affiliation": "National University of Science and Technology MISiS, Leninsky av. 4, Moscow 119049, Russia & Department of Physics and I3N, University of Aveiro, 3810-193 Aveiro, Portugal", 
        "name": "Nikolai A Sobolev"
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    "description": "<p>We present an investigation into the magnetic sensing performance of magnetoelectric bilayered metglas/bidomain LiNbO<sub>3</sub>&nbsp;long thin bars operating in a cantilever or free vibrating regime and under quasi-static and low-frequency resonant conditions. Bidomain single crystals of Y&thinsp;&thinsp;+&thinsp;&thinsp;128&deg;-cut LiNbO<sub>3</sub>&nbsp;were engineered by an improved diffusion annealing technique with a polarization macrodomain structure of the &#39;head-to-head&#39; and &#39;tail-to-tail&#39; type. Long composite bars with lengths of 30, 40 and 45&thinsp;mm, as well as with and without attached small tip proof masses, were studied. ME coefficients as large as 550 V (cm&nbsp;&nbsp;Oe)<sup>&minus;1</sup>, corresponding to a conversion ratio of 27.5 V Oe<sup>&minus;1</sup>, were obtained under resonance conditions at frequencies of the order of 100 Hz in magnetic bias fields as low as 2 Oe. Equivalent magnetic noise spectral densities down to 120 pT Hz<sup>&minus;1/2</sup>&nbsp;at 10 Hz and to 68 pT Hz<sup>&minus;1/2</sup>&nbsp;at a resonance frequency as low as 81 Hz were obtained for the 45&thinsp;mm long cantilever bar with a tip proof mass of 1.2&thinsp;g. In the same composite without any added mass the magnetic noise was shown to be as low as 37 pT Hz<sup>&minus;1/2</sup>&nbsp;at a resonance frequency of 244 Hz and 1.2 pT Hz<sup>&minus;1/2</sup>&nbsp;at 1335 Hz in a fixed cantilever and free vibrating regimes, respectively. A simple unidimensional dynamic model predicted the possibility to drop the low-frequency magnetic noise by more than one order of magnitude in case all the extrinsic noise sources are suppressed, especially those related to external vibrations, and the thickness ratio of the magnetic-to-piezoelectric phases is optimized. Thus, we have shown that such systems might find use in simple and sensitive room-temperature low-frequency magnetic sensors, e.g. for biomedical applications.</p>"
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