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Two-Mode Magnetic Switching of a Ferromagnetic Nanowire-Granule-Array Embedded in a Porous Silicon Matrix

Published online by Cambridge University Press:  01 February 2011

K. Rumpf ,
P. Granitzer  and
H. Krenn
K. Rumpf
Affiliation:
Institute of Physics, Karl-Franzens-UniversityGraz, Universitaetsplatz 5, A-8010 Graz, Austria
P. Granitzer
Affiliation:
Institute of Physics, Karl-Franzens-UniversityGraz, Universitaetsplatz 5, A-8010 Graz, Austria
H. Krenn
Affiliation:
Institute of Physics, Karl-Franzens-UniversityGraz, Universitaetsplatz 5, A-8010 Graz, Austria
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Abstract

A low-cost method has been developed to produce metallic, perpendicularly oriented ferromagnetic nanowires embedded in crystalline silicon. The mesoporous silicon structure consists of channels with a diameter of about 60 nm and about 30 μm in depth. The electrochemically prepared ferromagnetic nanosystem is a composition of granules and wires which leads to a peculiar magnetic behaviour. The interesting magnetic properties of this bimodal system are investigated by SQUID-magnetometry. The hysteresis loop shows two switching fields at different magnetic fields, one in the low field range and the other one in the high field range. The first switching field at about 500 Oe is due to the magnetization of the granules, the second switching field nearby 5 T (at room temperature) is caused by dipolar coupling of the nanowires which become single domain at high fields due to Bloch Wall motions. This promising ferromagnetic nanocomposite system is not only interesting in basic research but gives raise to a lot of silicon based applications like spin-injection devices and magnetic field sensors.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 877: Symposium S – Magnetic Nanoparticles and Nanowires , 2005 , S7.2
Copyright
Copyright © Materials Research Society 2005

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