High-temperature multiferroic magnetoelectric sensors

Magnetoelectric (ME) sensors are an important tool to detect weak magnetic fields in the industry; however, to date, there are no high-quality ME sensors available for high-temperature environments such as engines, deep underground, and outer space. Here, a 0.364BiScO(3)-0.636PbTiO(3) piezoelectric ceramic and Terfenol-D alloy with a Curie temperature of 450 and 380 degrees C, respectively, were bonded together by an inorganic glue to achieve a high-temperature ME sensor. The ceramic shows a piezoelectric d(33) coefficient of 780 pC/N at 420 degrees C, and the inorganic glue has a high maximum stress of 9.12 MPa even at 300 degrees C. As a result, the sensor exhibits the maximum ME coefficient alpha(E) of 2.008, similar to 1.455, and similar to 0.906 V cm(-1) Oe(-1) at 20, 200, and 350 degrees C, respectively. Most importantly, the magnetic field detecting precision is as small as 42 nT at 20-350 degrees C. The ME sensor provides an effective solution for the detection of weak magnetic fields in harsh environments. Published under an exclusive license by AIP Publishing.

Automated summary

Magnetoelectric (ME) sensors are important tools for detecting weak magnetic fields, but there are currently no high-quality ME sensors available for high-temperature environments. By bonding a specific piezoelectric ceramic and alloy together using an inorganic glue, a high-temperature ME sensor with excellent piezoelectric performance and maximum stress was achieved. The sensor also exhibited high magnetic field detecting precision at different temperatures.