Contactless magnetic nanoparticle detection platform based on non-linear GMI effect

Magnetic Binary Encoding System Based on 3d Printing and Gmi Detection Prototype

“…A similar behavior was observed in a previous work [25] where a detection platform for the contactless and reusable detection of magnetic nanoparticles was developed. In this study, the larger size of the employed MNPs (mean diameter of 140 nm) led to a larger MNPs remanence after the application of the magnetizing field, H elec and so, more favorable detection conditions.…”

“…In those terms, previous GMI-based sensors for MNPs detection have been successfully developed [20], [21], [22]. More concretely, we have previously analyzed this topic using different geometries as ribbons [23], [24] and wires for the contactless and reusable detection [25] of the magnetic particles. In this work, a detection system is analyzed based on the voltage (amplitude), V, variations (V∝Z) underwent by an amorphous wire of nominal composition (Co 0.94 Fe 0.06 ) 72.5 Si 12.5 B 15 , while scanning over the 3D barcoded piece.…”

Monitoring structural transformations in metamagnetic shape memory alloys by non-contact GMI technology

“…Finally, an implemented 'two-phase lock-in amplifier' provides two output DC voltages which are proportional to the phase and quadrature components of the second harmonic voltage V 2f , whose root mean square permitted to obtain the final output signal, V 2fout . Further details about analog electronics can be consulted in [23]. As previously mentioned, the utilization of the second harmonic voltage, V 2f , was justified by its reported improved sensitivity, when compared to the fundamental one in the characterization of low magnetic fields, i.e.…”

“…In the search for more sensitive sensors, previous works have reported the enhanced sensitivity in the vicinity of zero magnetic fields of the non-linear GMI effect, specifically the second harmonic voltage, V 2f [21,22] compared with the fundamental one. Explicitly, the superior capacity of the second harmonic to design high-sensitivity magnetic detectors was previously analyzed [23][24][25] in situations where very low magnetic fields were involved.…”

Broadband measurements of the surface impedance in ferromagnetic wires as a boundary condition for scattering problems

“…ferromagnetic microwires [2][3][4][5][6], ribbons [7], and thin films [8][9][10]. Apart from fundamental research interest, in the technological context materials exhibiting a large MI effect arise as field/stress-sensitive sensors that can be integrated into a wide range of devices [11][12][13][14][15][16]. Special emphasis has been placed on Co-based and Fe-based glass-coated microwires.…”