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Influence of Interface Structure of Co/Cu (100) Superlattices on Electronic Structure and Giant Magnetoresistance |
| LU Shuo;SHANG Jia-Xiang;ZHANG Yue |
| School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083 |
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| Cite this article: |
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LU Shuo, SHANG Jia-Xiang, ZHANG Yue 2007 Chin. Phys. Lett. 24 3229-3232 |
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Abstract Electronic structures and magnetoresistance (MR) of Co3Cu5 and Co3Cu7 models as well as their interface atom exchange models Co2CuCoCu4 and
Co2CuCoCu6 are investigated by the first-principles pseudopotential plane-wave method based on density functional theory. Charge transfer, magnetic moment, density of states, spin asymmetry factor, and MR ratio are discussed. The results show that the values of charge transfer and spin asymmetry factor at the Fermi level of Co layers are closely related to the neighbouring background of the Co layer. The Co layer with two sides adjacent to the Cu layer would transfer more charge to the Cu layer than other neighbouring background and have the largest spin asymmetry factor at the Fermi level. The Co layer with two neighbouring Co layers (interior Co) would gain a little
charge and have the smallest spin asymmetry factor at the Fermi level. Two-current model is used to evaluate the MR ratio of Co2CuCoCu_4 (Co2CuCoCu6) to be larger than that of Co3Cu5 (Co3Cu7), which can be explained by the charge transfer and spin asymmetry factor.
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| Keywords:
73.20.At
73.21.Cd
75.47.De
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Received: 10 May 2007
Published: 23 October 2007
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| PACS: |
73.20.At
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(Surface states, band structure, electron density of states)
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73.21.Cd
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(Superlattices)
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75.47.De
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(Giant magnetoresistance)
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