Influence of the L21 ordering degree on the magnetic properties of Co2MnSi Heusler films
Influence of the L21 ordering degree on the magnetic properties of Co2MnSi Heusler films
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DOI：
10.1063/1.2931023
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发表时间：
2008-05-15
影响因子：
3.2
通讯作者：
Ando, Y.
中科院分区：
文献类型：
--
作者：
Gaier, O.;Hamrle, J.;Ando, Y.
我们报告了改进的 L2(1) 有序度对 Co2MnSi Heusler 薄膜磁性能的影响。 L2(1)相的不同分数是通过350摄氏度到500摄氏度的不同后生长退火温度获得的。室温磁光克尔效应测量揭示了在425摄氏度的中间退火温度下矫顽力的增加。这可能是一方面钉扎中心数量增加和另一方面立方各向异性常数K-1下降10倍的结果。增加 L2(1) 相的量。此外，布里渊光散射研究表明，Co2MnSi 薄膜中 L2(1) 级数的提高与饱和磁化强度降低约 7% 相关。然而，当 L2(1) 阶数提高时，Co2MnSi 的交换刚度常数增加了约 8%。 (C) 2008 年美国物理研究所。
We report on the influence of the improved L2(1) ordering degree on the magnetic properties of Co2MnSi Heusler films. Different fractions of the L2(1) phase are obtained by different postgrowth annealing temperatures ranging from 350 degrees C to 500 degrees C. Room temperature magneto-optical Kerr effect measurements reveal an increase of the coercivity at an intermediate annealing temperature of 425 degrees C. This is probably a result of an increasing number of pinning centers on the one hand and a drop of the cubic anisotropy constant K-1 by a factor of 10 on the other for an increasing amount of the L2(1) phase. Furthermore, Brillouin light scattering studies show that the improvement of the L2(1) order in the Co2MnSi films is correlated with a decrease of the saturation magnetization by about 7%. The exchange stiffness constant of Co2MnSi, however, increases by about 8% when the L2(1) order is improved. (C) 2008 American Institute of Physics.