The combination of a merged MR head and a dual-layer perpendicular disk is a promising technology for futui-e high-density recording. High-density recording using this combination was charccterized $0 obtain 3 3 5 0 of 98 kFCI for read operations, a D5,, of 80 kFCI for write operations, and an overwrite of 50 dF5, and the results were compared with those for longitudinal recording. Higher-density recording is expected to be achieved by optimizing the shield gap length in the read element, the pole thickness in the write element, and the Ms value of a disk.
The medium noise in a Cr-rich Co-Cr alloy perpendicular medium was investigated by using an MR head designed for longitudinal recording. Medium with a Cr content of 28 at.% showed a high crystalline orientation and a low write-demagnetization effect. The signal-to-noise ratio ( S N ) of the medium was higher than that of conventional Co-Cr perpendicular media for inductive heads. The advantages of the medium derive from the large inter-particle perpendicular magnetic intexaction (AML) of media, which increased linearly with the Cr content, reaching a maximum value at 28 at.%. This strong interaction in the medium results in a high SIN for a recording system using a single-layer perpendicular medium and an MR head.
Effects of intermediate layers on magnetic properties and read/write performance in CoCrPt perpendicular recording media with an FeHfN soft magnetic underlayer
Numerical simulations of shear-thinning and shear-thickening fluid flows past a circular cylinder are performed using a lattice Boltzmann method. In this study, the property of shear-thinning and shear-thickening fluids is expressed by the Carreau model. We focus on the definition of an effective (representative) Reynolds number for describing the flow of shear-thinning and shearthickening fluids past a circular cylinder. The fluid flows and viscosity profiles are clearly shown for fluids flowing across a circular cylinder depending on the Reynolds and Carreau numbers and the power index. A large value of Carreau number lead to the formation of low-viscosity regions for shear-thinning and high-viscosity regions for shear-thickening around a circular cylinder. Meanwhile, the change in the viscosity around the cylinder is not remarkable for a small Carreau number. The formulation of the effective Reynolds number defined using effective shear rate and viscosity is proposed in order to organize and understand the flow of Carreau-model fluids across a circular cylinder. The effective Reynolds number counseled in this study allows one to completely describe the flow state of Carreau-model fluids past a circular cylinder on an equal footing with Newtonian fluid flows. The usefulness of the effective Reynolds numbers is discussed, and the feature of Carreau-model fluid flows past a circular cylinder is considered in terms of the effective Reynolds number.
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