We have investigated the evolution of the in-plane magnetic hysteresis behavior of Co/Cu(001) films (in the monolayer range) by means of the transverse magneto-optical Kerr effect. Shortly after the onset of long-range order, the deposition was stopped and the almost square hysteresis loop which resulted revealed a small coercive field (Hc=0.9 G) indicating a Curie temperature Tc close to room temperature. Further Co deposition in small increments showed a dramatic increase of Hc. An increase of 9% in the thickness resulted in a variation of Hc in the range 0.9 G
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Schumann et al. (1993) studied this question.
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