Pt Content Dependence of the Switching Field Distributions of CoPtCr-SiO$_{2}$ Perpendicular Media Characterized by Subtracting the Effect of Thermal Agitation
Pt Content Dependence of the Switching Field Distributions of CoPtCr-SiO$_{2}$ Perpendicular Media Characterized by Subtracting the Effect of Thermal Agitation
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通过减去热搅拌的影响来表征 CoPtCr-SiO$_{2}$ 垂直介质的转换场分布的 Pt 含量依赖性
DOI：
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发表时间：
2007
影响因子：
2.1
通讯作者：
Y. Nakamura
中科院分区：
文献类型：
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作者：
T. Shimatsu;T. Kondo;K. Mitsuzuka;S. Watanabe;H. Aoi;H. Muraoka;Y. Nakamura
通过扣除热扰动的影响，表征了CoPtCrSiO<sub>2</sub>垂直介质的开关场分布（SFD）与Pt含量的关系，并讨论了与微观结构的关系.在~10 Oe/s和~ 108 Oe/s的磁场扫描速率下测量了直流退磁（DCD）磁化曲线和微小直流退磁（M-DCD）磁化曲线。<sup></sup>根据DCD曲线和M-DCD曲线的差异，估算了SFD的宽度Δ SFD，并将其定义为Δ<sub>Hr</sub>/<sub>Hr</sub>（~ 10 Oe/s）和Δ<sup>HrP</sup>/<sup>HrP</sup>（~<sup>108</sup> Oe/s）。<sub></sub><sub></sub>通过减去热搅拌的影响，DeltaH<sub>0</sub>/H<sub>0</sub>，其特征在于的值的DeltaSFD是近一半的DeltaH<sub>r</sub>/H<sub>r</sub>为10 nm厚的介质。Δ H<sub>0</sub>/H<sub>0</sub>在10原子%Pt含量下为约0.10，并且随着Pt含量增加而增加，在30原子%Pt含量下达到0.17。Δ H<sub>0</sub>/H<sub>0</sub>的增加可能是由于在hcp CoPtCr晶格中的堆垛层错密度的增加和fcc层的形成。一个简单的计算的基础上的磁化强度的相干切换显示，c轴分布的结果在DeltaH<sub>0</sub>/H<sub>0</sub>约为0.08，独立的Pt含量。这些结果表明，由晶粒间各向异性场变化引起的Δ SFD很小，仅为0.02-0.03
The switching field distributions (SFD) of CoPtCr-SiO<sub>2</sub> perpendicular media as a function of Pt content were characterized by subtracting the effect of thermal agitation, and discussed in relation to the microstructure. DC demagnetizing (DCD) magnetization curves and minor dc demagnetizing (M-DCD) magnetization curves were measured at applied field sweep rates of ~10 Oe/s and ~10<sup>8</sup> Oe/s. We estimated the width of SFD, DeltaSFD, from the difference between the DCD and M-DCD curves, and defined them as DeltaH<sub>r</sub>/H<sub>r </sub> (at ~ 10 Oe/s) and DeltaH<sub>r</sub> <sup>P</sup>/H<sub>r</sub> <sup>P</sup> (at ~10<sup>8</sup> Oe/s). The values of DeltaSFD characterized by subtracting the effect of thermal agitation, DeltaH <sub>0</sub>/H<sub>0</sub>, were nearly half those of DeltaH<sub>r </sub>/H<sub>r</sub> for 10-nm-thick media. DeltaH<sub>0</sub>/H<sub>0 </sub> was about 0.10 at 10 at%Pt content, and increased as the Pt content increased, reaching 0.17 at 30 at%Pt content. The increase in DeltaH<sub>0</sub>/H<sub>0</sub> was probably caused by an increase in the stacking fault density and the formation of fcc layers in the hcp CoPtCr lattice. A simple calculation based on the coherent switching of magnetization revealed that the c-axis distribution results in DeltaH <sub>0</sub>/H<sub>0</sub> of about 0.08, independent of Pt content. These results suggest that the DeltaSFD due to the grain-to-grain anisotropy field variation was small, only 0.02-0.03