论文标题
W（110）在可变温度下通过软X射线吸收光谱研究的Mn单层的自旋螺旋状态
Spin-spiral state of a Mn monolayer on W(110) studied by soft x-ray absorption spectroscopy at variable temperatures
论文作者
论文摘要
通过软X射线吸收光谱研究研究了钨（110）上外延MN单层的非连线磁态，以补充早期的Spin Polarized STM实验。 X射线吸收光谱（XAS），X射线线性二色性（XLD）和X射线磁性圆形二色性（XMCD）Mn L23-边缘在温度范围为8到300 K，并且与完全占主导地位的AB Initio Initio计算的结果相比。我们表明，抗铁磁（AFM）螺旋和循环螺旋会产生明显不同的Mn L23-EDGE XLD信号，从而使它们区分它们。从我们的结果来看，W（110）上的Mn单层的磁接地态是AFM环形自旋螺旋。基于温度依赖性XA，XLD和田间诱导的XMCD光谱，我们推断出Mn单层在W（110）上的磁性特性随温度而变化，但是这种变化表明，在调查的温度范围内，在Xas分支率和XAS分支速率的温度依赖性中，调查的温度范围为300 k-频率范围为300 k-，并且在XAS依赖率均存在。
The noncollinear magnetic state of epitaxial Mn monolayers on tungsten (110) crystal surfaces is investigated by means of soft x-ray absorption spectroscopy, to complement earlier spin-polarized STM experiments. X-ray absorption spectra (XAS), x-ray linear dichroism (XLD) and x-ray magnetic circular dichroism (XMCD) Mn L23-edge spectra were measured in the temperature range from 8 to 300 K and compared to results of fully-relativistic ab initio calculations. We show that antiferromagnetic (AFM) helical and cycloidal spirals give rise to significantly different Mn L23-edge XLD signals, enabling thus to distinguish between them. It follows from our results that the magnetic ground state of a Mn monolayer on W(110) is an AFM cycloidal spin spiral. Based on temperature-dependent XAS, XLD and field-induced XMCD spectra we deduce that magnetic properties of the Mn monolayer on W(110) vary with temperature, but this variation lacks a clear indication of a phase transition in the investigated temperature range up to 300 K - even though a crossover exists around 170 K in the temperature dependence of XAS branching ratios and in XLD profiles.
