Growth conditions to optimize chemical order and magnetic properties in molecular-beam-epitaxy-grown CoPt/MgO(001) thin films
Growth conditions to optimize chemical order and magnetic properties in molecular-beam-epitaxy-grown CoPt/MgO(001) thin films
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优化分子束外延生长的 CoPt/MgO(001) 薄膜的化学顺序和磁性能的生长条件
DOI：
10.1063/1.1538319
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发表时间：
2003
影响因子：
3.2
通讯作者：
C. Ulhaq
中科院分区：
文献类型：
--
作者：
O. Ersen;V. Parasote;V. Pierron;M. Cadeville;C. Ulhaq
通过分子束外延在MgO（001）衬底上生长的CoPt薄膜，当[001]单变体L10结构沿生长方向沿着发展时，有望发展出非常大的单轴磁晶各向异性和高磁导率。本研究调查的生长条件，提供最佳的结构质量的薄膜及其相关的磁性能。衬底表面质量、Pt缓冲层的厚度和织构以及Cr籽晶层的存在与否是影响薄膜中取向良好的晶粒比例的决定因素，而生长温度则主要影响薄膜的L10有序度η。[001]晶粒（Ku001）的单轴磁晶各向异性能在化学计量组成下最大，并随η线性增加。讨论了矫顽力和磁畴尺寸与薄膜的微观结构、L10有序度和磁微观常数的关系。
CoPt films grown on MgO(001) substrates by molecular-beam epitaxy are expected to develop a very large uniaxial magnetocrystalline anisotropy and a high coercivity when the [001] single variant L10 structure develops along the growth direction. The present study investigates the growth conditions that provide the best structural quality of the films and their related magnetic properties. The quality of the substrate surface, the thickness, and the texture of the Pt buffer layer, the presence or absence of a Cr seed layer, are found to be determinants for the fraction of well-oriented grains in the films, whereas the growth temperature mainly pilots the degree of L10 order η. The uniaxial magnetocrystalline anisotropy energy of the [001] grains (Ku001) is maximum at the stoichiometric composition and shows a linear increase with η. The coercive fields and the magnetic domain size are discussed in relation to the microstructure, the degree of L10 order and the magnetic microscopic constants of the films.