Amorphous wire and CMOS IC-based sensitive micromagnetic sensors utilizing magnetoimpedance (MI) and stress-impedance (SI) effects

Tuneable Composites Containing Magnetic Microwires

“…4) Additionally, stress-impedance (SI) and torsion impedance (TI) effects showing high sensitivity of the impedance to the applied stress with a strain gauge factor of 2000-4000 have been found in amorphous wires Zhukov, 2006;Panina et al, 2005;Tejedor et al, 2001;Shen et al, 1997). For MI sensor applications, a CMOC IC circuitry with pulse current operation has been developed (Zhukov et al, 2008;Mohri et al, 2002). As a result, the GMI and SI sensors with the CMOC IC circuitry with advantageous features comparing with conventional magnetic sensors have been developed by different companies Vazquez et al, 2011;Mohri et al, 2001;Honkura, 2002).…”

Electromagnetic sensor technology for biomedical applications

“…One of the most successful solutions utilises a pulse excitation of the GMI element with the help of C-MOS digital circuits (Mohri & Honkura, 2007;Mohri et al, 2002, Shen et al, 1997. The circuit with a C-MOS IC multivibrator as shown in Fig.…”

“…Integration of both GMR and GMI sensing concepts could be a possibility. The discovery of GMI effect in 1993 Beach & Berkowicz, 1994) had a strong impact on the development of micro magnetic sensors operating in the nano-Tesla www.intechopen.com range Mohri et al, 2001Mohri et al, , 2002. In certain soft magnetic materials, such as composites of amorphous thin wires, the impedance change (GMI ratio) is in the range of more than 100 % in the MHz frequency band for the external magnetic fields of 0.1mTesla.…”

Engineering of Magnetic Properties of Magnetic Microwires

“…The GMI effect is satisfactory interpreted in terms of classical electrodynamics considering skin effect in magnetically soft conductor [8][9][10]. High circumferential magnetic permeability typical for amorphous magnetic wires is the necessary feature for observation of high GMI effect [6][7][8].…”