Origin of Large Perpendicular Anisotropy in Co_3Pt Alloy Thin Film
Origin of Large Perpendicular Anisotropy in Co_3Pt Alloy Thin Film
复制标题
Co_3Pt合金薄膜大垂直各向异性的成因
DOI：
10.3379/jmsjmag.23.1855
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发表时间：
1999
影响因子：
--
通讯作者：
T. Suzuki
中科院分区：
文献类型：
--
作者：
Y. Yamada;T. Suzuki
研究了沉积在Al2O3（00·1）衬底上的Co3Pt合金薄膜的磁性各向异性为107 erg/cm3的原因。磁各向异性常数Ku随着衬底沉积温度的增加而增大，在Ts≈400℃时达到最大值。在这些薄膜中发现了Co3Pt有序相。x射线衍射估计的序参量S在Ts≈400℃时达到最大值。当Ts大于约380℃时，Ku和S对Ts的行为相似。样品的Ku值越大，S值越高，但在S=0时，Ku值仍为107 erg/cm3。在Ts≈330℃时，降低沉积速率可以增强Ku和S。在这些实验结果的基础上，提出了一个模型来解释Ku对s的依赖。在这个模型中，假设观测到的Ku包括无序相和有序相的两个组成部分。在此模型的基础上，可以较好地量化无序相和有序相对总磁各向异性的贡献。
The origin of a magnetic anisotropy of the order of 107 erg/cm3 observed in Co3Pt alloy thin films deposited onto Al2O3(00·1) substrates is investigated. The magnetic anisotropy constant Ku increases with the substrate deposition temperature Ts, which exhibits a maximum at Ts ≈ 400°C. The Co3Pt ordered phase is found to exist in these films. The order parameter S estimated by X-ray diffraction reaches a maximum at Ts ≈ 400°C. The behaviors of Ku and S with respect to Ts are similar when Ts is greater than about 380°C. The samples show a larger Ku with higher S. However, Ku still remains 107 erg/cm3 at S=0. Both Ku and S can be enhanced by reducing the deposition rate at Ts ≈ 330°C. On the basis of these experimental results, a model is proposed to account for the dependence of Ku on S. In this model, the observed Ku is assumed to include two components of the disordered and ordered phases. The contributions of the disordered and ordered phases to the total magnetic anisotropy can be reasonably well quantified on the basis of the model.