论文标题
$α$ -Fege $ _2 $嵌入垂直旋转阀设备中的电子和磁性特性
Electronic and magnetic properties of $α$-FeGe$_2$ films embedded in vertical spin valve devices
论文作者
论文摘要
我们研究了亚型$α$ -FEGE $ _2 $，一种新型的分层四方材料，嵌入了带有铁磁Fe $ _3 $ _3 $ SI和CO $ _2 $ _2 $ fesi Electrodes的旋转阀结构中的间隔层。对于两种类型的电极，旋转阀操作都以$α$ -FEGE $ _2 $垫片层的金属传输行为证明。发现自旋阀信号随温度和间隔厚度增加，这是根据铁磁底部和顶部电极之间的磁耦合强度降低的。旋转阀结构的温度依赖性电阻具有特征，这些特征是由55至110〜K之间的铁磁相变。发现金属运输特性以及低温铁磁学与第一原理计算的结果一致。
We studied metastable $α$-FeGe$_2$, a novel layered tetragonal material, embedded as a spacer layer in spin valve structures with ferromagnetic Fe$_3$Si and Co$_2$FeSi electrodes. For both types of electrodes, spin valve operation is demonstrated with a metallic transport behavior of the $α$-FeGe$_2$ spacer layer. The spin valve signals are found to increase both with temperature and spacer thickness, which is discussed in terms of a decreasing magnetic coupling strength between the ferromagnetic bottom and top electrodes. The temperature-dependent resistances of the spin valve structures exhibit characteristic features, which are explained by ferromagnetic phase transitions between 55 and 110~K. The metallic transport characteristics as well as the low-temperature ferromagnetism are found to be consistent with the results of first-principles calculations.
