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Electronic Structure and Magnetic Properties of SmCo7-xZrx |
| ZHANG Chang-Wen1;LI Hua1;DONG Jian-Min1;GUO Yong-Quan2;LI Wei2 |
| 1School of Physics and Microelectronics, Shandong University, Jinan 250100
2Institute of Functional Materials, Central Iron & Steel Research Institute, Beijing 100081 |
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| Cite this article: |
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ZHANG Chang-Wen, LI Hua, DONG Jian-Min et al 2006 Chin. Phys. Lett. 23 1581-1584 |
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Abstract The electronic structure and magnetism of SmCo7-xZrx alloy are investigated using the spin-polarized MS-X. method. The results show that a few of electrons are transferred to the Sm(5d0) orbital due to orbital hybridization between Sm and Co atoms. The exchange interactions between 3d and 5d electrons are more important than the polarization effects of the conductive electrons, thus it is the main reason resulting in the long-range ferromagnetic order in SmCo7-xZrx. The Curie temperature of SmCo7-xZrx is generally lower than that of corresponding pure Co, which may be explained by the weaker average coupling strength between Co lattices due to some negative couplings mainly occurring of 2e site. The calculated results for the Sm5Co32Zr2 cluster may lead to a better understanding of why SmCo7-xZrx is stable phase. Since the spin-up DOS peak of d electrons at EF arises and the bonding of electrons at EF strengthens with increasing Zr concentration, which results in the internal energy of the system decrease, the stable ferromagnetic order forms in SmCo7-xZrx.
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| Keywords:
75.50.Cc
75.10.Lp
71.70.Gm
71.20.Eh
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Published: 01 June 2006
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| PACS: |
75.50.Cc
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(Other ferromagnetic metals and alloys)
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75.10.Lp
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(Band and itinerant models)
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71.70.Gm
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(Exchange interactions)
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71.20.Eh
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(Rare earth metals and alloys)
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