To model magnetic field of RF planar coil for portable NMR applications

A sensitive on‐chip probe–based portable nuclear magnetic resonance for detecting low parasitaemia plasmodium falciparum in human blood

“…For this investigation, we have considered planar spiral coil (PSC)–based probe which generates a high magnetic field perpendicular to the external magnetic field ( B 0 ) and most suitable for localized biological applications. Detailed study on the modelling, simulation and fabrication of PSC for magnetic field has been reported in our recent study (Gupta, 2018; Gupta & Agrawal, 2017; Manish Gupta et al., 2019). We have considered the theoretical performance of micro‐fabricated NMR probes in terms of mass sensitivity.…”

“…Due to the advancement in coil fabrication technologies, several pioneering studies related to micro-coils/miniaturize coilbased probes with different coil dimensions and geometries, that is, Solenoidal, Saddle, Helmholtz, Alderman-Grant, Birdcage and Planar, have been reported in literatures (Dechowa, Forchel, Lanz, & Haase, 2000;Ehrmann et al, 2006;Haase, Hanicke, & Frahm, 1984,;Massin et al, 2002Massin et al, , 2003Minard & Wind, 2001;Misakian, 2000;Olson, Peck, Webb, Magin, & Sweedler, 1995;Peck, Magin, Kruse, & Feng, 1994;Peck, Magin, & Lauterbur, 1995;Stocker, Peck, Webb, Feng, & Magin, 1997;Trumbull, Glasgow, Beebe, & Magin, 2000;Watzlaw, Glöggler, Blümich, Mokwa, & Schnakenberg, 2013;Webb, 1997). Several studies on RF coils we have already presented in our previous reports in Gupta and Agarwal (2017), Gupta, Safvan, and Lobiyal (2019). Recently, Ali, Poenar, and Aditya (2017) came up with a design of micro-NMR probe in which copper micro-coils were buried in the surface of the silicon substrate.…”

Designing a Spintronic Based Magnetoresistive Bridge Sensor for Current Measurement and Low Field Sensing

“…This method was proven to be accurate when compared with COMSOL simulations and experimental measurements for the implemented AMR bridge sensor and for a giant magnetoresistive (GMR)-based current sensor. Several specific optimizations were performed to the model, which reduce complexity significantly and do not require computationally intensive FEM simulations compared with other solutions shown in the literature [31,[33][34][35], which either lack automation or require computationally intense steps. Further developments of the analytical method can focus on geometric corrections for multi-trace or non-linear trace configurations.…”

“…Several approaches from the literature have proposed modeling of the field produced by various configurations of single or multiple loops of wire in the same plane [31,32]. Most solutions focus on complex integral solutions that are usually solved with numerical methods [33], through FEM simulations [34], or serve application-specific purposes [35]. Although most methods that can be found in the literature are accurate up to a certain point, they are not adapted for the specificity required for field estimation in common setups in which magnetoresistive sensors are involved.…”