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High spin polarization in Co2CrAl-Cr superlattice

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Zitation

Dai, X., Joudan, M., & Felser, C. (2009). High spin polarization in Co2CrAl-Cr superlattice. Journal of Physics D: Applied Physics, 42(8): 084014, pp. 1-5. doi:10.1088/0022-3727/42/8/084014.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0018-99C5-9
Zusammenfassung
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.