A Magnetic Sensor Based on the Nonlinear Effect of Co-Rich Amorphous Wire

Area of Science:

• Physics
• Materials Science
• Electrical Engineering

Background:

• Amorphous magnetic materials exhibit unique electromagnetic properties.
• The nonlinear behavior of magnetic cores is crucial in various electronic applications.

Purpose of the Study:

• To investigate the induction of DC voltage in a coil with a FeCoSiB amorphous wire core under AC current and DC magnetic field.
• To characterize the relationship between induced DC voltage and AC current parameters (frequency, amplitude) and applied DC magnetic field.
• To develop a magnetic sensor based on the observed phenomenon.

Main Methods:

• A 40-turn coil was wound around a 0.1 mm diameter, 8 mm length FeCoSiB amorphous wire.
• AC current was applied to the coil, and the induced DC voltage was measured under varying AC current frequencies and amplitudes, and applied DC magnetic fields.
• A magnetic sensor prototype was constructed using the coil, an amplifier, and a low-pass filter.

Main Results:

• A DC voltage was observed to be induced by a DC magnetic field.
• The magnitude of the induced DC voltage was dependent on AC current frequency, amplitude, and applied DC magnetic field.
• A peak DC voltage of approximately 90 mV/Gauss was recorded at 78 mA AC current and 6.8 MHz frequency.
• The phenomenon is potentially linked to the nonlinearity of the FeCoSiB amorphous wire core.

Conclusions:

• The study demonstrates a novel method for inducing DC voltage using AC current and a DC magnetic field in a coil with a FeCoSiB amorphous wire core.
• This effect has been successfully utilized to develop a functional magnetic sensor.
• Further research into the nonlinear magnetic properties of amorphous wires could lead to advanced sensor technologies.