Publication

Electron transport in multilayered Co/Cu nanowires

Jean-Philippe Ansermet
1995
Journal Articles

Abstract

The magnetoresistance (MR) of magnetic multilayers formed by electrodeposition of Co and Cu in the parallel pores of nanoporous polycarbonate membranes was measured in the current-perpendicular-to-plane (CPP-MR) geometry, with Co acid Cu thicknesses in the range 2-50 nm. Ratios reaching 20% at ambient temperature and 30% at 20 K were obtained. A systematic study of the magnetoresistance as a function of the Co and Cu thicknesses was interpreted in terms of a two-current model. The volume and interface resistance asymmetry parameters could be deduced and the ability to determine the spin diffusion length by this method was discussed. An estimate of the Cu spin flip length has been found. Comparison of the data at 20 and 300 K showed that the product of the resistance change and the maximum resistance is temperature invariant.

Official source

https://infoscience.epfl.ch/entities/publication/125963f2-0030-46ee-9758-01f5f7e4a68a

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Jean-Philippe Ansermet
1995
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/125963f2-0030-46ee-9758-01f5f7e4a68a

About this result

Related concepts (21)

Electrical resistance and conductance

The electrical resistance of an object is a measure of its opposition to the flow of electric current. Its reciprocal quantity is , measuring the ease with which an electric current passes. Electrical resistance shares some conceptual parallels with mechanical friction. The SI unit of electrical resistance is the ohm (Ω), while electrical conductance is measured in siemens (S) (formerly called the 'mho' and then represented by ℧). The resistance of an object depends in large part on the material it is made of.

Negative resistance

In electronics, negative resistance (NR) is a property of some electrical circuits and devices in which an increase in voltage across the device's terminals results in a decrease in electric current through it. This is in contrast to an ordinary resistor in which an increase of applied voltage causes a proportional increase in current due to Ohm's law, resulting in a positive resistance. While a positive resistance consumes power from current passing through it, a negative resistance produces power.

Eddy current

In electromagnetism, eddy currents (also called Foucault's currents) are loops of electric current induced within conductors by a changing magnetic field in the conductor according to Faraday's law of induction or by the relative motion of a conductor in a magnetic field. Eddy currents flow in closed loops within conductors, in planes perpendicular to the magnetic field. They can be induced within nearby stationary conductors by a time-varying magnetic field created by an AC electromagnet or transformer, for example, or by relative motion between a magnet and a nearby conductor.

Related publications (1)

Electron transport in multilayered Co/Cu nanowires

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