论文标题
使用L2 $ _1 $ co $ _2 $ mnsi heusler goper的二次和线性磁通型kerr效应光谱的缩放尺度
Scaling of quadratic and linear magnetooptic Kerr effect spectra with L2$_1$ ordering of Co$_2$MnSi Heusler compound
论文作者
论文摘要
Heusler Compound Co $ _2 $ MNSI提供了从B2到L2 $ _1 $结构的晶体学过渡，随着退火温度的升高$ T_A $，是一种模型系统，用于研究结构，磁性，磁性，选项和磁磁（MO）属性的晶体订购影响。在这里，我们介绍了二次磁磁体kerr效应（QMOKE）光谱，具体取决于$ m^2 $，除了线性磁磁通型kerr效应（Linmoke）光谱与$ m $成正比，均在从0.8 \，ev，ev到5.5 \ \，ev的扩展光谱范围中。我们调查了一组Co $ _2 $ MNSI薄膜，该薄膜存放在MGO（001）基板上，并从300 $^\ Circ $ C到500 $^\ Circ $ c。 Linmoke和Qmoke Spectra的幅度与$ T_A $线性缩放，并且这种效果在低于2.0 \（QMOKE Spectra的EV）的谐振峰上很明显。此外，MO参数的光谱完全描述了CO $ _2 $ MNSI的MO响应，直到$ M $中的第二订单，取决于$ T_A $。最后，将光谱与纯L2 $ _1 $订购的CO $ _2 $ MNSI HEUSLER化合物的Ab-Initio计算进行了比较。
The Heusler compound Co$_2$MnSi provides a crystallographic transition from B2 to L2$_1$ structure with increasing annealing temperature $T_a$, being a model system for investigating the influence of crystallographic ordering on structural, magnetic, optic, and magnetooptic (MO) properties. Here, we present quadratic magnetooptic Kerr effect (QMOKE) spectra depending on $M^2$ in addition to the linear magnetooptic Kerr effect (LinMOKE) spectra being proportional to $M$, both in the extended visible spectral range of light from 0.8\,eV to 5.5\,eV. We investigated a set of Co$_2$MnSi thin films deposited on MgO(001) substrates and annealed from 300$^\circ$C to 500$^\circ$C. The amplitude of LinMOKE and QMOKE spectra scales linearly with $T_a$, and this effect is well pronounced at the resonant peaks below 2.0\,eV of the QMOKE spectra. Furthermore, the spectra of the MO parameters, which fully describe the MO response of Co$_2$MnSi up to the second order in $M$, are obtained dependend on $T_a$. Finally, the spectra are compared to ab-initio calculations of a purely L2$_1$ ordered Co$_2$MnSi Heusler compound.
