Publication

Investigation of Giant-Magneto-Impedance (GMI) effect and magnetic hysteresis in microfabricated Permalloy/Copper device

Radivoje Popovic, Pavel Kejik
2007
Conference Papers

Abstract

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.

Official source

https://infoscience.epfl.ch/entities/publication/cda86fb7-6a82-4ff8-bbe2-eee612af0a32

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Radivoje Popovic, Pavel Kejik
2007
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/cda86fb7-6a82-4ff8-bbe2-eee612af0a32

About this result

Related concepts (32)

Inductance

Inductance is the tendency of an electrical conductor to oppose a change in the electric current flowing through it. The flow of electric current creates a magnetic field around the conductor. The field strength depends on the magnitude of the current, and follows any changes in current. From Faraday's law of induction, any change in magnetic field through a circuit induces an electromotive force (EMF) (voltage) in the conductors, a process known as electromagnetic induction.

Magnetic hysteresis

Magnetic hysteresis occurs when an external magnetic field is applied to a ferromagnet such as iron and the atomic dipoles align themselves with it. Even when the field is removed, part of the alignment will be retained: the material has become magnetized. Once magnetized, the magnet will stay magnetized indefinitely. To demagnetize it requires heat or a magnetic field in the opposite direction. This is the effect that provides the element of memory in a hard disk drive.

Inductor

An inductor, also called a coil, choke, or reactor, is a passive two-terminal electrical component that stores energy in a magnetic field when electric current flows through it. An inductor typically consists of an insulated wire wound into a coil. When the current flowing through the coil changes, the time-varying magnetic field induces an electromotive force (emf) (voltage) in the conductor, described by Faraday's law of induction. According to Lenz's law, the induced voltage has a polarity (direction) which opposes the change in current that created it.

Related publications (6)

Investigation of Giant-Magneto-Impedance (GMI) effect and magnetic hysteresis in microfabricated Permalloy/Copper device

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