Magnetic Anisotropy of Perpendicular Media: Measurement and Intermediate Layer Effect
Magnetic Anisotropy of Perpendicular Media: Measurement and Intermediate Layer Effect
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DOI：
10.1109/tmag.2006.888203
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发表时间：
2007-01
影响因子：
2.1
通讯作者：
Hiroaki Nemoto;Ryoko Araki;Y. Hosoe
中科院分区：
文献类型：
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作者：
Hiroaki Nemoto;Ryoko Araki;Y. Hosoe
利用转矩磁强计研究了在不同中间层上形成的垂直磁性薄膜的单轴磁各向异性。我们仔细分析了扭矩曲线的形状，以便我们可以分离二次（Ku 1）和四次（Ku 2）各向异性能量项的大小。然而，事实证明，Ku值包含不可避免的误差所造成的磁各向异性的色散时，他们估计在一个有限的测量磁场（Hext），真正的Ku 2项接近于零，在我们所有的样品。然后，我们利用Hext依赖的视Ku值的分析的磁各向异性色散的垂直介质。通过对不同的内模层的系统研究，直接证明了CoCrPt-SiO2存储层的磁色散不仅是由于在存储层中添加氧化物引起的，而且也是由于在不合适的内模层上晶体生长引起的。我们进一步证明了Pt-Cr/Ru叠层IML成功地避免了磁分散，这导致了优异的记录性能，并且存储层和软磁衬层之间的总间距较小
We investigated the uniaxial magnetic anisotropy of perpendicular magnetic film formed on various intermediate layers (IMLs) using torque magnetometry. We carefully analyzed the shapes of the torque curves so that we could separate the magnitudes of the quadratic (Ku1) and quartic (Ku2) anisotropy energy terms. However, it turned out that the Ku values contained inevitable errors caused by the dispersion of magnetic anisotropy when they were estimated at a finite measurement magnetic field (Hext), and that the true Ku2 terms were close to zero among all of our samples. Then, we utilized the Hext dependence of the apparent Ku values for the analysis of magnetic anisotropy dispersion of perpendicular media. Through a systematic study on various IMLs, it was directly proven that the magnetic dispersion of the CoCrPt-SiO2 storage layer arose not only from the addition of oxide into the storage layer but also from the crystal growth on ill-suited IMLs. We further demonstrated that a Pt-Cr/Ru-laminated IML successfully avoided magnetic dispersion, which led to excellent recording performance with less total spacing between the storage layer and the soft-magnetic underlayer