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.