NDLI: Porous silicon/Ni composites of high coercivity due to magnetic field-assisted etching.

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Porous silicon/Ni composites of high coercivity due to magnetic field-assisted etching.

Content Provider	Europe PMC
Author	Granitzer, Petra Rumpf, Klemens Ohta, Toshiyuki Koshida, Nobuyoshi Poelt, Peter Reissner, Michael
Copyright Year	2012
Abstract	Ferromagnetic nanostructures have been electrodeposited within the pores of porous silicon templates with average pore diameters between 25 and 60 nm. In this diameter regime, the pore formation in general is accompanied by dendritic growth resulting in rough pore walls, which involves metal deposits also offering a branched structure. These side branches influence the magnetic properties of the composite system not only due to modified and peculiar stray fields but also because of a reduced interpore spacing by the approaching of adjacent side pores. To improve the morphology of the porous silicon structures, a magnetic field up to 8 T has been applied during the formation process. The magnetic field etching results in smaller pore diameters with less dendritic side pores. Deposition of a ferromagnetic metal within these templates leads to less branched nanostructures and, thus, to an enhancement of the coercivity of the system and also to a significantly increased magnetic anisotropy. So magnetic field-assisted etching is an appropriate tool to improve the structure of the template concerning the decrease of the dendritic pore growth and to advance the magnetic properties of the composite material.
ISSN	19317573
Journal	Nanoscale Research Letters
Volume Number	7
PubMed Central reference number	PMC3460775
Issue Number	1
PubMed reference number	22784792
e-ISSN	1556276X
DOI	10.1186/1556-276x-7-384
Language	English
Publisher	Springer
Publisher Date	2012-07-11
Access Restriction	Open
Rights License	This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Copyright ©2012 Granitzer et al.; licensee Springer.
Subject Keyword	Magnetic field-assisted anodization Porous silicon Magnetic nanostructures 68.65.-k 75.75.-c 81.07.-b
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology Condensed Matter Physics Materials Science

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