Abstract
The electronic structure, magnetic properties and interface effects in Co2CrAl–Cr superstructures have been investigated by the use of first principle calculations. The results show that at the interface, a large magnetic moment and a high spin polarization can be induced by a strong ferromagnetic exchange interaction at the Cr–Co interface. However, at the CrAl–Cr interface, both the magnetic moment and the spin polarization of the Cr atoms are decreased due to a Cr–Cr antiferromagnetic interaction. It can also be found that the interface effect is only a short range effect. So, high spin polarization in Co2CrAl–Cr superlattice can be obtained. Based on this theoretical analysis, a large giant magnetoresistance effect can be expected in the Co2CrAl–Cr superlattices with proper thickness of the Cr spacer layers.
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