Investigation of giant-magneto-impedance (GMI) effect and magnetic hysteresis in microfabricated permalloy/copper device

In this paper, we present the giant-magneto-impedance (GMI) effect in a microfabricated closed Permalloy core which surrounds a copper excitation rod. We measured a 90% change in the inductance value of the device for a sinusoidal excitation at 500 kHz in a 4.5mT range. The change in the device resistance is negligible for excitation frequencies below 1 MHz, and goes above 14% for 30 MHz excitation. Magnetic hysteresis of the device inductance is studied and improved by applying periodic "degauss" pulses during measurement, instead of increasing the amplitude of the excitation current or using traditional annealing processes.


Published in:
Transducers '07 & Eurosensors Xxi, Digest Of Technical Papers, Vols 1 And 2, U1297-U1298
Presented at:
14th International Conference on Solid-State Sensors, Actuators and Microsystems, Lyon, FRANCE, Jun 10-14, 2007
Year:
2007
Publisher:
Ieee Service Center, 445 Hoes Lane, Po Box 1331, Piscataway, Nj 08855-1331 Usa
ISBN:
978-1-4244-0841-2
Keywords:
Laboratories:




 Record created 2012-07-04, last modified 2018-03-17


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