A new projection description for a cubic quasiperiodic crystal (CQC), including a projection matrix, diffraction-intensity calculation and a linear phason matrix, has been proposed. The simulated electron diffraction patterns with appropriate phason parameters agree well with the experimental ones obtained for a rapidly solidified V6Nil6Si7 alloy. The transition from the CQC to its crystalline approximants is treated using the linear-phason-strain concept.
The coercivity of Co-based ͑CoCrTa and CoCrPt͒, disk media was found to depend on temperature. The thinner the film, the smaller the switching unit (K u V), and the larger dH c /H c dT. dH c /H c dT for CoCrTa ͑400 Å͒ on different underlayers or intermediate layers is generally larger than that of CoCrPt ͑400 Å͒ on different underlayers or intermediate layers. The temperature dependence of coercivity in Co-based disk media is caused by the temperature dependence of crystalline anisotropy of Co and small switching unit of the media.
As track density increases, it has become even more critical to understand the track edge. In this study, the impact of media design on the track edges in perpendicular magnetic recording has been investigated. This study shows that soft under layer thickness and intergranular exchange coupling have significant impact on both track edge erasure and write width. In the range we studied, head-tokeeper spacing and media coercivity have a strong impact on write width, but not on track edge erasure. On the other hand, media design does not impact transition curvature significantly. Experimental observations were supported by media micromagnetic modeling results and write field simulation using a finite element model. Analyzing the write bubble helps to understand the dependence of adjacent track encroachment on media design. Cross track profiles of various signal-to-noise ratio (SNR) components can provide valuable insights into different track edge mechanisms.
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