Abstract
<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> We report a magnetic characterization of iron thin films of 6 nm prepared on Si (001) substrates by sputtering at different substrate temperatures. Magnetization loops and zero field cooling-field cooling measurements were performed to unveil the magnetic features of such systems. Magnetic parameters show that films prepared at very low temperature (<formula formulatype="inline"> <tex Notation="TeX">${T}_{\rm S}=200$</tex></formula> K) present features of a core-shell granular systems, formed by ferromagnetic iron grains surrounded by an antiferromagnetic iron oxide phase. </para>
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