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Magnetization reversal in sputtered Co and oxidized Co ͑CoOx͒ layers are studied using transport measurements and magneto-optic Kerr effect. When associated in a magnetic tunnel junction, the two magnetic layers show a strong ferromagnetic coupling. Using the tunnel magnetoresistive effect as a probe for micromagnetic studies, we show the existence of an unexpected domain structure in the soft Co layer. This domain structure originates from the duplication of the domain structure of the harddoi:10.1103/physrevb.61.11643 fatcat:nw7r6m5lsrbpxkakgxmsfpthku