High sensitive orthogonal fluxgate magnetometer using Metglas ribbon

Fluxgate effect in twisted magnetic wire

“…The orthogonal fluxgate usually works at 2 nd harmonics. A "fundamental-mode orthogonal fluxgate" [2,3] should use large dc current bias, which makes the sensor unpractical.…”

Advances in Magnetic Field Sensors

“…As this sensor is saturated only in one polarity, the basic offset stability is poor and it can be improved by periodic switching of the excitation bias. The authors in [45] achieved a sensitivity of 1.8 , offset stability of 1.2 nT/hour and a noise level of about 100…”

“…Almost all commercially available AMR sensors use a "barber pole" structure, in which aluminum stripes sputtered on permalloy strips deflect the direction of the current by 45 and make the characteristics linear. Four such meander-shaped elements are connected into a Wheatstone bridge.…”

Fast method of locating metallic foreign body in the human body

“…We have chosen a 2-mm-wide, 15-ȝm-thick metgals 2705M Co 76 Fe 2 Mn 4 B 12 Si 6 ribbon as a material for the fluxgate core, which has higher sensitivity as well as a better linearity of input-output characteristics compared with vitrovac 6025 [4].The ribbon was bent in a non-magnetic steel skeleton of race-track shape. The excitation coil was wound around the core with 200 turns of a 0.21-mm diameter copper wire.…”