On the in-plane uniaxial anisotropy formation by using Fe-Co-Zr-N films: A theoretical and experimental investigation
On the in-plane uniaxial anisotropy formation by using Fe-Co-Zr-N films: A theoretical and experimental investigation
复制标题
利用 Fe-Co-Zr-N 薄膜形成面内单轴各向异性：理论和实验研究
DOI：
10.1016/j.jmmm.2016.04.031
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发表时间：
2016
影响因子：
2.7
通讯作者：
H. Leiste
中科院分区：
文献类型：
--
作者：
K. Seemann;S. Beirle;H. Leiste
本文介绍了一种简单的理论方法来研究薄膜中面内单轴各向异性的演化。为了说明在外部静磁场中退火铁磁膜期间形成单轴各向异性的条件是什么，通过引入它们的退火温度依赖性，建立了平均能量平衡。在这一点上，一个一维链状排列的Fe和Co元素的“各向同性”和单轴各向异性状态的数值计算被假定。结果表明，可以达到一个临界能量和退火温度（温度阈值），从单轴各向异性的出现。相比之下，根据Neél理论的计算提供了诱导单轴各向异性的激活能。用磁控溅射制备的Fe_（40）Co_（37）Zr_（11）N_（12）薄膜对计算结果进行了实验验证，得到了约250 meV的激活能。退火温度高于473 K（200 °C）时，可以产生显著的单轴各向异性。这与量子力学的数值估计相关，该估计产生了约449 K（176 °C）的临界退火温度。如果假定（5Fe+5Co）线上至少有10个铁磁原子的短程有序排列，计算得到的临界能量为243 meV，与已验证的实验符合得很好。
In the present paper a simple theoretical approach for the in-plane uniaxial anisotropy evolution in thin films is introduced. In order to show, what are the conditions for a uniaxial anisotropy formation during annealing a ferromagnetic film in an external static magnetic field, a Hamiltonian, i.e., mean energy balances were established with introducing their annealing temperature dependence. At this point, a 1-dimesional chain-like arrangement of Fe and Co elements for an “isotropic” and uniaxial anisotropy state for the numerical computation was assumed. It was shown that a critical energy and annealing temperature (temperature threshold) can be attained from which a uniaxial anisotropy arises. Comparatively, calculations according to the Neél theory delivered the activation energy for inducing a uniaxial anisotropy. The experimental verification of the calculations, by using Fe40Co37Zr11N12films which were produced by reactive magnetron sputtering, yielded the activation energy of about 250 meV. Annealing temperatures above 473 K (200 °C) enabled marked uniaxial anisotropies. This correlated with the numerical quantum mechanical estimations which yielded a critical annealing temperature of approximately 449 K (176 °C). The calculated critical energy of 243 meV was in a good agreement with the verified experiments if one assumes a short range order of at least 10 ferromagnetic atoms in line (5Fe+5Co) for computation.
通过考虑涡流产生，对具有面内单轴各向异性的铁磁薄膜中的高频磁矩动力学进行 3D 理论研究
DOI：
--
发表时间：
2012
期刊：
影响因子：
--
作者：
K. Seemann;H. Leiste;K. Krüger
通讯作者：
K. Krüger