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采用KKR-CPA-LDA方法研究了CuMnAl,CoMnAl和CuCoMnAl四元合金中磁性原子磁矩和Co-Mn间的交换作用.通过与实验结果对比,揭示了Mn的磁矩和Co的磁矩以及它们的相互作用随成分变化的规律.研究发现,在Cu50Mn25+xAl25-x合金中超过化学配比并占据Al位的Mn原子是反铁磁的,而且由于近邻环境的不同,其磁矩大于原有Mn原子的磁矩.在Co50Mn25+<
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关键词:
- KKR-CPA-LDA计算 /
- Co-Mn间交换作用
Comparing with the experimental data, the composition dependence of atomic moment and Co-Mn exchange interaction in CuMnAl, CoMnAl and CuCoMnAl alloys have been investigated by KKR-CPA-LDA calculation. It has been found that, due to the different surrounding environments, the magnetic moment of excess Mn atom occupying Al sites is larger than that of the original Mn atoms on B sites in Cu50Mn25+xAl25-x alloys. When the Mn content increases in Co50Mn25+xAl25-x alloys, the moment of Co atom increases monotonically, while the Mn moment almost has the same value. In Cu50-xCoxMn25Al25 alloys, it has been revealed that the moment of Co decreases resulting from the decrease of the moment of Mn atom with the substitution of Co for Cu. These results indicate that the atomic moments of Mn and Co atoms are positively related. It has also been found that the Co-Mn exchange interaction can be enhanced by increasing Mn content and its strength comes not only from the added Co but also from the contribution of Mn.-
Keywords:
- KKR-CPA-LDA calculation /
- Co-Mn exchange interaction
[1] Yu S Y, Ma L, Liu G D, Liu Z H, Chen J L, Cao Z X, Wu G H 2007 Appl. Phys. Lett. 90 242501
[2] Yu S Y, Cao Z X, Ma L, Liu G D, Chen J L, Wu G H 2007 Appl. Phys. Lett. 91 102507
[3] Kainuma R, Imano Y, Ito W, Sutou Y, Morito H, Okamoto S, Kitakami O, Oikawa K, Fujita A, Kanomata T, Ishida K 2006 Nature(London) 439 957
[4] Ma L, Zhang H W, Yu S Y, Zhu Z Y, Chen J L, Wu G H 2008 Appl. Phys. Lett. 92 032509
[5] Kainuma R, Ito W, Umetsu R Y, Oikawa K, Ishida K 2008 Appl. Phys. Lett. 93 091906
[6] Ogura M, Akai H 2007 J. Phys.: Condens. Mat. 19 365215
[7] Kubler J, Williams A R, Sommers C B 1983 Phys. Rev. B 28 1745
[8] Webster P J 1969 Contemp. Phys. 10 559
[9] Khoi L D, Veillett P, Campbell I A 1978 J. Phys. F: Met. Phys. 8 8
[10] Zhang M, Bruck E, De Boer F R, Li Z Z, Wu G H 2004 J. Phys. D: Appl. Phys. 37 2049
[11] Kulkova S E, Kulkov S S, Subashiev A V 2006 Comput. Mater. Sci. 36 249
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[1] Yu S Y, Ma L, Liu G D, Liu Z H, Chen J L, Cao Z X, Wu G H 2007 Appl. Phys. Lett. 90 242501
[2] Yu S Y, Cao Z X, Ma L, Liu G D, Chen J L, Wu G H 2007 Appl. Phys. Lett. 91 102507
[3] Kainuma R, Imano Y, Ito W, Sutou Y, Morito H, Okamoto S, Kitakami O, Oikawa K, Fujita A, Kanomata T, Ishida K 2006 Nature(London) 439 957
[4] Ma L, Zhang H W, Yu S Y, Zhu Z Y, Chen J L, Wu G H 2008 Appl. Phys. Lett. 92 032509
[5] Kainuma R, Ito W, Umetsu R Y, Oikawa K, Ishida K 2008 Appl. Phys. Lett. 93 091906
[6] Ogura M, Akai H 2007 J. Phys.: Condens. Mat. 19 365215
[7] Kubler J, Williams A R, Sommers C B 1983 Phys. Rev. B 28 1745
[8] Webster P J 1969 Contemp. Phys. 10 559
[9] Khoi L D, Veillett P, Campbell I A 1978 J. Phys. F: Met. Phys. 8 8
[10] Zhang M, Bruck E, De Boer F R, Li Z Z, Wu G H 2004 J. Phys. D: Appl. Phys. 37 2049
[11] Kulkova S E, Kulkov S S, Subashiev A V 2006 Comput. Mater. Sci. 36 249
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