Patent
Perpendicular magnetic recording medium and process for manufacture thereof
Reads0
Chats0
TLDR
In this article, a perpendicular magnetic recording medium was proposed, in which each space between crystal grains of a first magnetic recording layer is designed as to allow the layer to also have a function as a continuous layer.Abstract:
An object of the present invention is to provide a perpendicular magnetic recording medium in which each space between crystal grains of a first magnetic recording layer is so designed as to allow the layer to also have a function as a continuous layer, and a method of manufacturing a perpendicular magnetic recording medium. In a perpendicular magnetic recording medium 100 according to the present invention, a first magnetic recording layer 122 a and a second magnetic recording layer 122 b are ferromagnetic layers each having a granular structure in which a grain boundary part made of a non-magnetic substance is formed between crystal grains each grown in a column shape and, in the first magnetic recording layer 122 a , an intergranular distance defined by an average of shortest distances between grain boundary parts each between a crystal grain and its adjacent crystal grain is equal to or shorter than 1 nm.read more
Citations
More filters
Patent
Underlayers for heat assisted magnetic recording (HAMR) media
TL;DR: In this article, a heat assisted magnetic recording (HAMR) media comprising of a magnetic recording layer, a barrier layer, and an amorphous seedlayer was proposed. But the authors did not specify the type of seed layer.
Patent
Perpendicular magnetic recording medium and method of manufacturing the same
TL;DR: In this paper, a perpendicular magnetic recording medium comprises a magnetic recording layer that records a signal, an underlayer formed of Ru or Ru compound below the recording layer, a non-magnetic layer formed of a nonmagnetic material below the underlayer, a soft magnetic layer provided below the non-MAGNIFICENT layer, and a substrate on which the magnetic recording layers, the under layer, the non -magnetic layers, and the soft magnetic layers are formed.
Patent
Perpendicular magnetic recording medium
TL;DR: In this paper, the first non-magnetic underlayer is made of an amorphous nonmagnetic metal material containing a metal element which forms a face-centered cubic (fcc) crystal structure by a simple substance.
Patent
Magnetic disk and method for manufacturing same
TL;DR: In this article, a magnetic disk comprising a granular magnetic recording layer which causes less noise even with a recording capacity thereof of 250 G or more bits per square inch was presented. But the method for manufacturing the same was not described.
Patent
Magnetic disk and method of manufacturing the same
Katsushi Hamakubo,Kae Itoh +1 more
TL;DR: In this paper, a magnetic disk has at least a magnetic layer (6), a carbon-based protective layer (7), and a lubricating layer (8) provided in this order over a substrate, and the lubricating compound contains a compound having a perfluoropolyether main chain in a structure thereof and having a polar group other than at ends of a molecule thereof.
References
More filters
Patent
Magnetic recording medium
Takayama Kazuhisa,Fuji Hiroshi +1 more
TL;DR: In this paper, a magnetic recording medium consisting of a foundation layer 3 and a magnetic layer 5 sequentially formed on a substrate has been proposed, and a protective layer 6 is formed on the magnetic layer.
Patent
Magnetic recording medium.
TL;DR: In this article, the back layer is formed with a coating material contg. a filler, a binder and a silicon compd. The back layer has at least three carboxylate ester bonds and having a number average mol.wt.
Patent
Perpendicular magnetic discrete track recording disk
David Wachenschwanz,Gerardo A. Bertero,David Treves,Andrew Marian Homola,James L. Fremont Chao,Christopher H. Bajorek +5 more
TL;DR: In this article, a method of forming a discrete track recording pattern on a soft magnetic underlayer of a perpendicular magnetic recording disk is presented, where the underlayer is continuous throughout the recording pattern.
Patent
Circuit and method for refreshing data recorded at a density sufficiently high to undergo thermal degradation
TL;DR: In this paper, the refresh indicator can be any parameter that indicates a need to refresh the data prior to occurrence of one or more soft errors, and the refresh operation is performed, wherein the to-berefreshed data is read from and written back to the same storage medium.