Abstract
Fe/body-centered-tetragonal(bct) Mn superlattices on (0 0 1)-oriented Ge substrates have been prepared by molecular beam epitaxy (MBE). X-ray measurements confirm the high quality of the samples, which all show increased lattice spacing in growth direction compared with bulk bcc Fe. RHEED reflection position analysis proves a different growth behavior of the Fe/Mn and Mn/Fe interfaces. Magnetic measurements show a long period of the oscillatory exchange coupling, but no two-monolayer oscillation. Moreover, all samples show a dramatic reduction of the saturation magnetization (Ms), up to 50%, with increasing Mn layer thickness, probably due to the formation of an antiferromagnetic alloy at the Mn/Fe interface. A giant magnetoresistance (GMR) effect is observed for strong antiferromagnetically coupled Fe layers, which depends on the Mn layer thickness in the superlattice. None of the samples exhibited a ferro- or ferrimagnetic state of bct Mn.
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