Epitaxial Co/Cr superlattices Co (1120)/Cr(100) on MgO (100) and Co(1100)/Cr (211) on MgO(110) have been grown by molecular beam epitaxy technique. Buffer layer of Mo or CrMo alloy was first deposited on top of the substrate which is crucial to prepare a smooth and well-ordered Cr surfaces and the following superlattices. The epitaxial orientation of Co/Cr (100) superlattices is Co//Cr//MgO , Co//Cr//MgO and Co//Cr//MgO, while that for Co/Cr(211) is Co//Cr//MgO, Co//Cr//MgO and Co// Cr//MgO. (CoxCry)n superlattices with different Co thickness (x), Cr thickness (y) and number of layers (n) have been deposited. The maximum magnetoresistance of the Co/Cr(211) superlattices is 18% comparing with the 4.8% for Co/Cr(100) superlattices. The magnetization measurements also show that the antiferromagnetic coupling in Co/Cr(211) superlattices is stronger than in Co/Cr(100) superlattices. The magnetic properties are strongly influenced by the crystal orientation of the multilayers.
All Science Journal Classification (ASJC) codes