Thermal stability in perpendicular recording media
Thermal stability in perpendicular recording media
复制标题
垂直记录介质的热稳定性
DOI：
10.1016/s0304-8853(01)00358-4
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发表时间：
2001
影响因子：
2.7
通讯作者：
Y. Nakamura
中科院分区：
文献类型：
--
作者：
T. Shimatsu;H. Uwazumi;H. Muraoka;Y. Nakamura
基于使用脉冲磁力计获得的实验结果，讨论了实现高热稳定性和低噪声性能所需的 CoCrPt 基垂直记录介质的磁性和结构特性。实验和理论分析表明，对于热稳定系数KuV/(kT)≈80、厚度为20nm的CoCrPt基介质，晶粒剩磁矫顽力与各向异性场之比的最大可实现值Hr/Hki为～0.35。此外，为了实现接近1.0的大矩形度Mr/Ms2，这是抵抗低记录密度下的热搅动效应所需要的，我们发现垂直磁晶各向异性的值Kuneeded需要比2πMs2大三倍以上。 X 射线衍射图表明，抑制 HCP 结构中的结构缺陷，特别是在初始生长层中，是在 CoCrPt 基介质中诱导更大 Kuvalue 的关键问题。
Magnetic and structural properties of CoCrPt based perpendicular recording media required to achieve both high thermal stability and low-noise performance are discussed, based on experimental results obtained using a pulse magnetometer. Experimental and theoretical analysis reveal that for CoCrPt based media of 20nm thickness having the thermal stability factor KuV/(kT)≈80, the maximum achievable value of the ratio of remanence coercivity to anisotropy field of grains, Hr/Hkis ∼0.35. Furthermore, in order to realize a large squareness Mr/Msof nearly 1.0, which is required to resist the thermal agitation effect at low recording density, we find that the value of perpendicular magnetocrystalline anisotropy, Kuneeded to be more than three times larger than 2πMs2. X-ray diffraction patterns suggested that the suppression of structural imperfections in the HCP structure, particularly in the initial growth layer, is the key issue to induce larger Kuvalue in the CoCrPt based media.