Abstract
Since few decades, research in the magnonic area, which studies the phenomenon of spin waves propagation in magnetic materials, has grown simultaneously with the emergence of the so-called spintronic and nano-structured magnetic materials. Recent works exposed the interest of such devices for designing magnetic field sensors, considering the dependence of the transmission parameter S <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">21</sub> regarding the external applied magnetic field, for excitation frequency of several GHz. In this paper, we have investigated the ability of spin wave propagation phenomenon to be used as a magnetometer by characterizing its expected performances, particularly the output sensitivity, expressed in unit of V/T. The sensing element is designed from a YIG film (10 mm x 5 mm x 19.4 μm) deposited on GGG substrate. It is placed on a microstrip antenna transducer made of two copper lines, respectivelyto excite and measure the spin waves. The excitation is provided by a sine electromagnetic wave at a fixed frequency f <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> = 1.146GHz. The induced spin waves propagate along the main length direction of the YIG material and induce a voltage signal at the output antenna at the carrier frequency f <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> . When the external DC magnetic field varies, it yields a modulated signal. The dedicated and reduced electronic conditioning circuitry, based on a I/Q quadrature demodulator, allows to extract the field variations information with an output sensitivity of about 20V/T. Considering that the dominating noise sources are those due to the electronic conditioning circuitry, a sensor equivalent magnetic noise √ level of several nT/ Hz in white noise region was obtained.
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