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arXiv 1904.01993cond-mat.mtrl-sci
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退火对Mn2RuxGa薄膜性能影响的研究

Study of the Effect of Annealing on the Properties of Mn2RuxGa Thin Films

K. E. Siewierska, G. Atcheson, K. Borisov, M. Venkatesan, K. Rode, J. M. D. Coey

摘要:

研究了补偿亚铁磁半金属Mn 2 Rux Ga在250 ~ 400 ℃的真空退火薄膜的效果。沉积在(100)MgO衬底上的39.3nm薄膜由于衬底应变引起的1%的四向伸长而表现出垂直磁各向异性。退火的主要变化是补偿温度的修改,其首先从沉积膜的50 K增加到在250摄氏度退火后的185 K,然后在400摄氏度退火后下降到140 K。原子有序度、介电常数、电阻率和反常霍尔效应(AHE)都有微小的变化,但在面内或面外磁场作用下,SQUID磁强计测得的净磁化强度变化更为显著。在室温下,它在20至30 kA/m处饱和,并且在垂直SQUID回路中看到小的软分量,这在正方形AHE磁滞回线中是不存在的。这是由化合物的半金属性质解释的; AHE探测仅在费米能级提供自旋极化电子的4c Mn亚晶格,而SQUID测量相反排列的4c和4a亚晶格磁化的总和。

英文摘要:

The effect of vacuum annealing thin films of the compensated ferrimagnetic half-metal Mn2RuxGa at temperatures from 250 to 400 degree Celsius is investigated. The 39.3 nm films deposited on (100) MgO substrates exhibit perpendicular magnetic anisotropy due to a small 1% tetragonal elongation induced by substrate strain. The main change on annealing is a modification in the compensation temperature, which first increases from 50 K for the as-deposited film to 185 K after annealing at 250 degree Celsius, and then falls to 140 K after annealing at 400 degree Celsius. There are minor changes in the atomic order, coercivity, resistivity and anomalous Hall effect (AHE), but the net magnetization measured by SQUID magnetometry with the field applied in-plane or perpendicular-to-the-plane changes more significantly. It saturates at 20 to 30 kA/m at room temperature, and a small soft component is seen in the perpendicular SQUID loops which is absent in the square AHE hysteresis loops. This is explained by the half-metallic nature of the compound; the AHE probes only the 4c Mn sublattice that provides the spin-polarized electrons at the Fermi level, whereas the SQUID measures the sum of the oppositely-aligned 4c and 4a sublattice magnetisations.

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