Abstract
FeSi/Cu compositionally modulated films (CMFs) with different modulation wavelengths have been obtained by rf sputtering. When the thickness of Cu layers is fixed, the saturation magnetization and the Curie temperature of CMFs decrease with a decreasing thickness of magnetic layers. This result is caused by a dead layer effect and dimensional effects. For FeSi/Cu CMFs with the thickness of FeSi layers of 9 Å, a linear thermomagnetic relation, i.e., the two-dimensional magnetism is obtained. Varying the thickness of Cu layers with fixed FeSi layer thickness, it is found that for Cu layers thinner than 15 Å, the exchange coupling between FeSi layers appeared, but it caused the saturation magnetization of CMFs to decrease. A “mictomagnetic-like” phenomenon is observed at low temperature and low fields. This behavior is a consequence of irreversible effects due to the domain wall pinning.
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