Figure 1 | Scientific Reports

Figure 1

From: Novel Handheld Magnetometer Probe Based on Magnetic Tunnelling Junction Sensors for Intraoperative Sentinel Lymph Node Identification

Figure 1

MTJ magnetometer probe schematic diagram.

(a) The MTJ sensor bridge is mounted on the end of a small double-sided PCB and positioned inside a cylindrical electromagnet’s aperture, forming the probe tip. The electromagnet consisted of a 90-turn coil wound onto a ferrous core and was used to excite magnetic nanoparticles in either parallel or antiparallel magnetisation with respect to the sensing axis of the probe. (b) Due to the hollow core of the bobbin-shaped electromagnet, from finite element analysis, the magnetic signal can be seen to peak at approximately 2.5 mm from the probe tip, before decaying in a manner similar to that of solid-core electromagnets.

Back to article page