A soft ferromagnetic multiwire-based inductance coil sensor for sensing applications

Abstract

We present an effective approach to improve the sensitivity of inductance coil sensors by designing a sensor core that consists of multiple soft ferromagnetic microwires. A systematic study of the longitudinally excited magneto-inductive (LEMI) effect has been performed in a non-magnetic copper wire coil with a filler composed of multiple Co-rich amorphous microwires. Melt-extracted microwires of Co68.2Fe4.3B15Si12.5 and glass-coated microwires of Co68B15Si10Mn7 with excellent soft magnetic properties were used for this study. We have shown that the LEMI ratio and field sensitivity of an inductive coil depend strongly upon the filler-to-air ratio inside the coil, the magnetic softness, and the anisotropy axis distribution of the microwire. Relative to a single-microwire based sensor, the LEMI ratio and field sensitivity of a multi-microwire based sensor are enhanced by three to four times, when varying the number of microwires inside the inductive coil. The sensitivity of the sensor using four glass-coated Co68B15Si10Mn7 microwires in the core reaches a maximum value of 1957%/Oe. Our study paves a pathway for the development of novel room-temperature electric contact free magnetic sensors for use in industry, biomagnetism, space science, and geoscience.

Magnetic Property and GMI Effect of MFe2O4 Nanoparticles

“…The above results can be interpreted by considering the disturbance of the magnetic excitation and ac transverse fields due to the presence of the fringe magnetic fields of the SPIO nanoparticles in the sensing element coil. As the concentration of SPIO nanoparticles is increased, the strength of fringe fields also increases, thus disturbing the magnetic excitation in the sensing element to a greater degree and consequently altering the MX [8][9][10][11]. In the present case, the increases of MX ratio ([X/X]) with increasing concentration of SPIO nanoparticles (Fig.…”

“…: 84-943313567. Email: ngothuhuong2013@gmail.com https//doi.org/ 10.25073/2588-1124/vnumap.4079 ferromagnetic materials, including magnetic wires, ribbons, and thin films [5,9]. Further, we have demonstrated a novel method of nanoparticles detection by designing a sensing element shell that consists of multiple rounds soft ferromagnetic ribbon Co rich and its core is super magnetic nanoparticles iron oxide CoFe 2 O 4 , which defined accurate concentration.…”

“…Further, we have demonstrated a novel method of nanoparticles detection by designing a sensing element shell that consists of multiple rounds soft ferromagnetic ribbon Co rich and its core is super magnetic nanoparticles iron oxide CoFe 2 O 4 , which defined accurate concentration. The MX ratio is largest at low frequency range from 2 MHz to 6 MHz [3][4][5][6][7][8][9]. In our researching, the change in the inductance of the coil-system is driven by an AC current in the presence of an external dc magnetic field along the axis of the coil, producing a longitudinally excited magneto-inductance(LEMI) effect.…”

“…As we known, the reactance X of the impedance component is related by the value of relatively permeability (  ). Accordingly, the induction voltage of the SEC ( i U ) could be attributed to the change of the impedance Z the SEC and defined as [9]: …”

Ferromagnetic glass-coated microwires with good heating properties for magnetic hyperthermia

“…The AGCMs present outstanding magnetic properties (e.g. magnetic bistability, giant magneto-impedance effect (GMI), fast domain wall propagation) for a variety of applications in magnetic sensors, microelectronics, security, and biomedical sensors18192021. The capacity of producing long and continuous wires with reduced dimension (diameter, 0.5–100 μm) and circular symmetry yields a significant advantage over other materials.…”