Noncollinear magnetism of Cr and Mn nanoclusters on Ni(111): Changing the magnetic configuration atom by atom
Noncollinear magnetism of Cr and Mn nanoclusters on Ni(111): Changing the magnetic configuration atom by atom
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Ni(111)上Cr和Mn纳米团簇的非共线磁性：逐个原子改变磁性构型
DOI：
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
S. Blügel
中科院分区：
文献类型：
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作者：
S. Lounis;P. Mavropoulos;R. Zeller;P. Dederichs;S. Blügel
The Korringa-Kohn-Rostoker Green-function method for noncollinear magnetic structures was applied on Mn and Cr nanoclusters deposited on the Ni(111) surface. We consider various dimers, trimers, and tetramers. We obtain collinear and noncollinear magnetic solutions, brought about by the competition of antiferromagnetic interactions. It is found that the triangular geometry of the Ni(111) substrate, together with the intracluster antiferromagnetic interactions, is the main cause of the noncollinear states, which are secondarily affected by the cluster-substrate exchange interactions. The stabilization energy of the noncollinear, compared to the collinear, states is calculated to be typically of the order of $100phantom{
ule{0.3em}{0ex}}mathrm{meV}∕ ext{atom}$, while multiple local-energy minima are found, corresponding to different noncollinear states, differing typically by $1char21{}10phantom{
ule{0.3em}{0ex}}mathrm{meV}∕ ext{atom}$. Open structures exhibit sizable total moments, while compact clusters tend to have very small total moments, resulting from the complex frustration mechanisms in these systems.
The Korringa-Kohn-Rostoker Green-function method for noncollinear magnetic structures was applied on Mn and Cr nanoclusters deposited on the Ni(111) surface. We consider various dimers, trimers, and tetramers. We obtain collinear and noncollinear magnetic solutions, brought about by the competition of antiferromagnetic interactions. It is found that the triangular geometry of the Ni(111) substrate, together with the intracluster antiferromagnetic interactions, is the main cause of the noncollinear states, which are secondarily affected by the cluster-substrate exchange interactions. The stabilization energy of the noncollinear, compared to the collinear, states is calculated to be typically of the order of $100phantom{
ule{0.3em}{0ex}}mathrm{meV}∕ ext{atom}$, while multiple local-energy minima are found, corresponding to different noncollinear states, differing typically by $1char21{}10phantom{
ule{0.3em}{0ex}}mathrm{meV}∕ ext{atom}$. Open structures exhibit sizable total moments, while compact clusters tend to have very small total moments, resulting from the complex frustration mechanisms in these systems.
Pt(111) 和 Au(111) 上 Co 团簇的磁矩、交换耦合和交叉温度
DOI：
10.1088/0953-8984/19/9/096203
发表时间：
2007
期刊：
Journal of Physics: Condensed Matter
影响因子：
--
作者：
O. Sipr;S. Bornemann;J. Minar;S. Polesya;V. Popescu;A. Simunek;H. Ebert
通讯作者：
H. Ebert