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AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsHiroshi Sakakima, Hideaki Adachi, Mitsuo Satomi, Yasuhiro Kawawake, Yasunari Sugita, Kenji Iijima
Estimating the term…
A magnetic recording medium includes a magnetic film for signal recording and a film containing M2Oy as a main component that is magnetically exchange-coupled to the magnetic film to increase the effective V and Ku of the magnetic film and to suppress thermal fluctuation. Herein, M is at least one element selected from Fe, Co, Ni, alkaline earth elements, Y, lanthanoids and Bi and includes at least one selected from Fe, Co and Ni as an essential element, and y is a value satisfying 2.8<y<3.2.
A magnetic recording apparatus comprising a magnetic recording medium and a magnetic head for recording information on the medium, the magnetic recording medium comprising:
A magnetic recording apparatus comprising a magnetic recording medium and a magnetic head for recording information on the medium, the magnetic recording medium comprising:
A magnetic recording apparatus comprising a magnetic recording medium and a magnetic head for recording information on the medium, the magnetic recording medium comprising:
Dependencies are inferred from the claim text.
From the US filing history. Foreign family members aren’t listed.
The record carriers consisting of several layers: having magnetic layers separated by a nonmagnetic layer, e.g. antiferromagnetic layer, Cu layer…
Having magnetic layers separated by a nonmagnetic layer, e.g. antiferromagnetic layer, Cu layer or coupling layer: having three or more magnetic…
Record carriers characterised by the form, e.g. sheet shaped to wrap around a drum: disk carriers
Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor: special dispositions…
Term ended 4 Jun 2021 (estimated)
1. Field of the Invention
The present invention relates to a magnetic recording medium and a magnetic recording apparatus using the same. In particular, the present invention relates to a magnetic recording medium in which thermal fluctuation is suppressed.
2. Description of the Prior Art
These and other advantages of the present invention will become apparent to those skilled in the art upon reading and understanding the following detailed description with reference to the accompanying figures.
FIG. 1 is a cross-sectional view showing an embodiment of a magnetic recording medium of the present invention.
FIG. 2 is a view showing an example of the magnetization curve of a conventional exchange-coupled film.
Hereinafter, preferable embodiments of the present invention will be described with reference to the accompanying drawings.
In the magnetic recording medium shown in FIG. 1, a magnetic film (first magnetic film) 1 for signal recording is magnetically exchange-coupled to a film 2 containing M2Oy as the main component, the films being formed over a substrate 3.
When the film 2 containing M2Oy as the main component is provided, the absolute value of a shift magnetic field s that is defined by Equation 1 below can be restricted to 200 Oe or less, preferably 100 Oe or less.