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Abstract
Arrays of nanometer-scale iron particles were fabricated by scanning tunneling microscopy assisted chemical vapor deposition. This allowed precise control over the particles' dimensions (diameters down to 9 nm) and their arrangement. The temperature dependence of the switching fields of these elongated particles revealed a thermally activated nucleation/propagation type of magnetization reversal even for our smallest particles. Improved high sensitivity Hall magnetometry allowed magnetic viscosity measurements which confirmed an activation volume much smaller than the particle size.
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