Atomic-scale spin spiral with a unique rotational sense:: Mn monolayer on W(001)
Atomic-scale spin spiral with a unique rotational sense:: Mn monolayer on W(001)
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DOI：
10.1103/physrevlett.101.027201
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发表时间：
2008-07-11
影响因子：
8.6
通讯作者：
Wiesendanger, R.
中科院分区：
文献类型：
--
作者：
Ferriani, P.;von Bergmann, K.;Wiesendanger, R.
用自旋极化扫描隧道显微镜研究表明，W(001)面上1个单分子层的磁序是沿晶体方向传播的自旋螺旋。螺旋在原子尺度上出现，周期约为2.2 nm，相当于只有10个原子行。从头算结果表明，在软化的铁磁交换耦合作用下，自旋螺旋是由Dzyaloshinskii-Moriya相互作用稳定的左旋摆线。蒙特卡罗模拟解释了纳米尺度迷宫图案的形成，这种图案源于两个可能的旋转域的共存，这是系统的内在特征。
Using spin-polarized scanning tunneling microscopy we show that the magnetic order of 1 monolayer Mn on W(001) is a spin spiral propagating along < 110 > crystallographic directions. The spiral arises on the atomic scale with a period of about 2.2 nm, equivalent to only 10 atomic rows. Ab initio calculations identify the spin spiral as a left-handed cycloid stabilized by the Dzyaloshinskii-Moriya interaction, imposed by spin-orbit coupling, in the presence of softened ferromagnetic exchange coupling. Monte Carlo simulations explain the formation of a nanoscale labyrinth pattern, originating from the coexistence of the two possible rotational domains, that is intrinsic to the system.