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(a) Scanning probe micrograph of a sample prepared at . [(b) and (c)] Topography and conductive micrograph obtained under an applied voltage of −1 V between the tip and the sample, black and white colors stand for high and low intensity values, respectively.
(a) ZFC at intermediate fields of granular Fe chains prepared at ; (b) magnetization loops at low temperatures; (c) TRM curves at and ; and (d) magnetization projection along the applied field in loops at .
Schematic representation of the oxidation processes of both types of samples. (a) Samples passivated at room conditions and (b) samples oxidized at low temperature.
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