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Structural,electronic and magnetic properties of the Mn-Ni(110) c(2×2) surface alloy

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【作者】 李登峰； 肖海燕； 祖小涛； 董会宁； 高飞；

【Author】 Li Deng-Feng~(a)b)+),Xiao Hai-Yan~(b)),Zu Xiao-Tao~(b)), Dong Hui-Ning~(a)),and Gao Fei a)Department of Mathematics and Physics,Chongqing University of Posts and Telecommunications,Chongqing 400065,China b)Department of Applied Physics,University of Electronic Science and Technology of China,Chengdu 610054,China c)Pacific Northwest National Laboratory,P.O.Box 999,Richland,WA 99352,USA

【机构】 Department of Mathematics and Physics,Chongqing University of Posts and Telecommunications； Department of Applied Physics,University of Electronic Science and Technology of China； Pacific Northwest National Laboratory,P.O.Box 999,Richland,WA 99352,USA；

【摘要】 <正>Using first-principles total energy method,we study the structural,the electronic and the magnetic properties of the MnNi(110) c(2×2) surface alloy.Paramagnetic,ferromagnetic,and antiferromagnetic surfaces in the top layer and the second layer are considered.It turns out that the substitutional alloy in the outermost layer with ferromagnetic surface is the most stable in all cases.The buckling of the Mn-Ni(110) c(2×2) surface alloy in the top layer is as large as 0.26 A(1 A=0.1 nm) and the weak rippling is 0.038 A in the third layer,in excellent agreement with experimental results.It is proved that the magnetism of Mn can stabilize this surface alloy.Electronic structures show a large magnetic splitting for the Mn atom,which is slightly higher than that of Mn-Ni(100) c(2×2) surface alloy(3.41 eV) due to the higher magnetic moment.A large magnetic moment for the Mn atom is predicted to be 3.81μB.We suggest the ferromagnetic order of the Mn moments and the ferromagnetic coupling to the Ni substrate,which confirms the experimental results.The magnetism of Mn is identified as the driving force of the large buckling and the work-function change.The comparison with the other magnetic surface alloys is also presented and some trends are predicted.

【Abstract】 Using first-principles total energy method,we study the structural,the electronic and the magnetic properties of the MnNi(110) c(2×2) surface alloy.Paramagnetic,ferromagnetic,and antiferromagnetic surfaces in the top layer and the second layer are considered.It turns out that the substitutional alloy in the outermost layer with ferromagnetic surface is the most stable in all cases.The buckling of the Mn-Ni(110) c(2×2) surface alloy in the top layer is as large as 0.26 A(1 A=0.1 nm) and the weak rippling is 0.038 A in the third layer,in excellent agreement with experimental results.It is proved that the magnetism of Mn can stabilize this surface alloy.Electronic structures show a large magnetic splitting for the Mn atom,which is slightly higher than that of Mn-Ni(100) c(2×2) surface alloy(3.41 eV) due to the higher magnetic moment.A large magnetic moment for the Mn atom is predicted to be 3.81μB.We suggest the ferromagnetic order of the Mn moments and the ferromagnetic coupling to the Ni substrate,which confirms the experimental results.The magnetism of Mn is identified as the driving force of the large buckling and the work-function change.The comparison with the other magnetic surface alloys is also presented and some trends are predicted.

【关键词】 manganese； nickel； magnetic surface alloy； density of states； density functional theory；
【Key words】 manganese； nickel； magnetic surface alloy； density of states； density functional theory；
【基金】 Project supported by the Special Funds of the National Natural Science Foundation of China(Grant No.10947102);the Foundation of Education Committee of Chongqing,China(Grant No.KJ090503);the Foundation of Science Committee of Chongqing,China (Grant No.CSTC 2007BB4385);the Doctoral Foundation of Chongqing University of Posts and Telecommunications,China (Grant No.A2008-64)
  • 【文献出处】 Chinese Physics B ,中国物理B , 编辑部邮箱 ,2010年08期
  • 【分类号】TG145
  • 【下载频次】14
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