Vertical magnetic recording medium, method for manufacturing vertical magnetic recording medium, and magnetic recording/reproducing device

Abstract

A vertical magnetic recording medium includes at least a lining layer, a seed layer, an intermediate layer and a vertical magnetic recording layer in this order on a nonmagnetic substrate. The seed layer is an hcp-structured (002) crystalline orientation layer, and the intermediate layer includes a first intermediate layer composed of a bcc-structured (110) crystalline orientation layer and a second intermediate layer composed of an hcp-structured (002) crystalline orientation layer in this order. The bcc-structured (110) crystalline orientation layer is preferably a structure containing a Cr of 60 atom% or more. The magnetic recording medium makes it possible to record / reproduce high-density information by achieving separation of crystal grains, a fine crystal grain diameter and vertical orientation of the vertical magnetic recording layer at the same time.

Description

technical field The present invention relates to a perpendicular magnetic recording medium, its manufacturing method, and a magnetic recording and reproducing apparatus using the magnetic recording medium. Background technique In recent years, the scope of application of magnetic recording devices such as magnetic disk devices, floppy disk devices, and magnetic tape devices has significantly increased, and while their importance has increased, the recording density of magnetic recording media used in these devices has continued to be significantly improved. improve. Especially since the introduction of MR head and PRML technology, the increase in areal recording density has become more intense. In recent years, GMR head and TuMR head have been introduced, and the increase continues at a rate of about 30-40% every year. Thus, magnetic recording media are required to achieve higher recording density in the future, and for this purpose, higher coercive force, higher signal-to...

AI Technical Summary

Problems solved by technology

However, in seed layers such as Mg and Ti, since there is a large difference in the lattice constant a between the Ru of the intermediate layer and the (002) crystal orientation plane, the noise due to the deterioration of the crystal orientation increases, so the recording and reproduction characteristics deteriorate.

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