Abstract
Epitaxial Co/Cr and Ni/Cr superlattices were prepared by using MBE. The crystal structure, interlayer exchange coupling, and magnetoresistance are discussed. The crystal structure of the CO and Ni grown on the bcc-Cr(OO1) were distorted hcp(1120) and, fcc(110), respectively. In the CO/ Cr system, an oscillatory exchange coupling, similar to that in an Fe/Cr system was observed, and the MR ratio was 2% at most. On the other hand, antiferromagnetic coupling was not observed in the Ni/Cr system, and the MR ratio was less than 0.1%. These differences are discussed from the viewpoint of mixing (alloying) at interfaces.
