Magnetic anisotropy of epitaxial Co/Mn superlattices: An angular-dependent ferromagnetic resonance study.
Magnetic anisotropy of epitaxial Co/Mn superlattices: An angular-dependent ferromagnetic resonance study.
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外延 Co/Mn 超晶格的磁各向异性：角度相关的铁磁共振研究。
DOI：
10.1103/physrevb.53.11562
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
Ounadjela
中科院分区：
文献类型：
--
作者：
Farle;Henry;Ounadjela
通过铁磁共振研究了外延 [${\mathrm{Co}}_{24\mathrm{}\mathrm{\AA{}}}$/Mn(${\mathit{t}}_{\mathrm{Mn}}$)${]}_{12}$ 超晶格的磁各向异性与 Mn 层厚度的函数关系。对于固定的钴层厚度，我们发现 Mn 层的临界厚度为 10\char21{}12 \AA{} 时从 (111) fcc 钴结构过渡到 (0001) hcp 钴结构。这可以从单轴磁晶各向异性从接近零急剧增加到 2\ifmmode\times\else\texttimes\fi{}${10}^{6}$ erg/${\mathrm{cm}}^{3}$ 看出。垂直面内共振线宽类似地增加了 4 倍，表明结构缺陷数量大幅增加。谐振场的完全面外角度依赖性产生二阶和四阶单轴磁各向异性常数，而铁磁共振线宽的完全面外角度依赖性给出磁均匀性的测量。理论模型很好地解释了实验结果，该模型使我们能够估计 Co 层内的缺陷数量并讨论其起源。 \textcopyright{} 1996 美国物理学会。
The magnetic anisotropy of epitaxial [${\mathrm{Co}}_{24\mathrm{}\mathrm{\AA{}}}$/Mn(${\mathit{t}}_{\mathrm{Mn}}$)${]}_{12}$ superlattices is studied as a function of the Mn layer thickness by means of ferromagnetic resonance. For fixed cobalt layer thickness one finds a transition from a (111) fcc to a (0001) hcp cobalt structure at a critical thickness of 10\char21{}12 \AA{} for the Mn layers. This is seen from the sharp increase of the uniaxial magnetocrystalline anisotropy from nearly zero to 2\ifmmode\times\else\texttimes\fi{}${10}^{6}$ erg/${\mathrm{cm}}^{3}$. A similar enhancement of the perpendicular to in-plane resonance linewidth by a factor of 4 indicates a strong increase of the number of structural defects. The complete out-of-plane angular dependence of the resonance field yields the second- and fourth-order uniaxial magnetic anisotropy constants whereas that of the ferromagnetic resonance linewidth gives a measure of the magnetic homogeneity. The experimental results are well explained by a theoretical model which allows us to estimate the number of defects within the Co layers and to discuss their origin. \textcopyright{} 1996 The American Physical Society.