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Fabrication of nanometer-sized ferromagnetic probe
(a) Simplified picture of the electrochemical etch of the iron wire through a bubble in the etching solution. (b) The SEM image of the bubble etched iron wire. The inset image enlarged the iron wire at the bubble interface where severe iron etching occurred.
(a) The iron wire etched and sharpened to a needlelike tip. (b) High magnification of the SEM image shows the top of the iron tip.
A very sharp nickel tip was fabricated by the optimizing process, which resulted in a radius on the apex of the tip.
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