论文标题
在B20-MNSI膜的居里温度下
On Curie temperature of B20-MnSi films
论文作者
论文摘要
B20型MNSI是原型磁性天际材料。 MNSI的薄膜显示出比其散装对应物更高的居里温度。但是，目前尚不清楚哪种机制导致居里温度的升高。在这项工作中，我们在SI（100）和SI（111）底物上种植了MNSI膜，其结构有很大变化。通过控制MN的厚度和退火参数，获得了多晶和纹理性质的纯MNSI相以及MNSI和MNSI1.7的混合相。出乎意料的是，所有这些MNSI膜显示出高达43 k的居里温度。居里温度可能独立于我们可访问性内的结构参数，包括高于阈值，应变，细胞体积和MNSI1.7混合物的膜厚度。然而，所有样品都观察到明显的声子软化，这可能归因于化学计量的过量MN，从而导致Curie温度升高。
B20-type MnSi is the prototype magnetic skyrmion material. Thin films of MnSi show a higher Curie temperature than their bulk counterpart. However, it is not yet clear what mechanism leads to the increase of the Curie temperature. In this work, we grow MnSi films on Si(100) and Si(111) substrates with a broad variation in their structures. By controlling the Mn thickness and annealing parameters, the pure MnSi phase of polycrystalline and textured nature as well as the mixed phase of MnSi and MnSi1.7 are obtained. Surprisingly, all these MnSi films show an increased Curie temperature of up to around 43 K. The Curie temperature is likely independent of the structural parameters within our accessibility including the film thickness above a threshold, strain, cell volume and the mixture with MnSi1.7. However, a pronounced phonon softening is observed for all samples, which can tentatively be attributed to slight Mn excess from stoichiometry, leading to the increased Curie temperature.
