Analysis of Noise in Magnetoelectric Thin-Layer Composites Used as Magnetic Sensors

作者：Zhuang Xin^*; Sing Marc Lam Chok; Cordier Christophe; Saez Sebastien; Dolabdjian Christophe; Das Jaydip; Gao Junqi; Li Jiefang; Viehland Dwight

来源：IEEE Sensors Journal, 2011, 11(10): 2183-2188.

DOI：10.1109/JSEN.2011.2114648

• Equivalent magnetic noise
• low-noise circuit
• magnetoelectric effect
• magnetoelectric (ME) charge coefficient

Taking advantage of magneto-elasto-electric interactions, new laminated composites of magnetostrictive and piezoelectric layers have been developed for highly sensitivity magnetoelectric (ME) sensors. The ME sensor design chosen in this study was based on long-type Metglas composites laminated together with piezoelectric fibers. In this paper, we analyze the expected limit of the magnetic noise of ME sensor versus its intrinsic characteristics and electronic setup. Theory calculations and experimental results are compared, and are well supported by noise measurements. Moreover, the presented results show very impressive performances in terms of the equivalent magnetic sensor noise. A 65 pT/root Hz equivalent magnetic noise was achieved at 1 Hz, while reaching values as low as 70 fT/root Hz near the ME resonant frequency.

• 出版日期2011-10