Hitachi Maxell, Limited

Hitachi Maxwell, Ltd.

Akira Yano

Satoshi Matsunuma

Tsuyoshi Onuma

Kouichirou Wakabayashi

Kunio Wakai

Tetsuo Mizumura

Yoichi Ogawa

Takanobu Takayama

Tetsunori Koda

Harumi Hieida

Takashi Kubota

Hideo Kusada

Michio Asano

Nobuyuki Inaba

Fumiyoshi Kirino

Teruaki Takeuchi

Enji Fujita

Takashi Naito

Hiroki Yamamoto

Norio Ohta

Katsusuke Shimazaki

Tetsuo Nakazawa

Hiroyuki Awano

Mitsutoshi Honda

Masaki Sekine

Tatsumi Hirano

Hideaki Yamanaka

Katsunori Kojima

The non-aqueous secondary battery of the present invention comprises a positive electrode containing a lithium-containing composite oxide as an active material, a negative electrode, a separator, and a non-aqueous electrolyte. The non-aqueous electrolyte contains polyvalent organic lithium salt, and the content of the polyvalent organic lithium salt is 0.001 parts by mass or more and 1 part by mass or less with respect to 100 parts by mass of all of the components of the non-aqueous electrolyte other than the polyvalent organic lithium salt.

Non-aqueous secondary battery comprising a polyvalent organic lithium salt

A magnetic recording medium based on the perpendicular magnetic recording system includes a substrate; a back layer which is formed on the substrate and which is formed of a soft magnetic material; an in-plane magnetized layer which is formed on the back layer and which has in-plane magnetization; and a recording layer which is formed on the in-plane magnetized layer and which has perpendicular magnetization, wherein the in-plane magnetized layer has a coercivity in an in-plane direction larger than a magnetic field generated by residual magnetization in a perpendicular direction of the recording layer. The influence on the reproduction output, caused by the mirror image effect of the soft magnetic back layer is reduced in wide range recording densities, thereby improving the resolution by decreasing the difference between the reproduction outputs of the magnetic recording medium at the low recording density and at the high recording density.

Magnetic recording medium and magnetic recording apparatus

A magnetic recording medium in which the medium noise is reduced and information can be recorded at a high S/N level, and a method for producing the magnetic recording medium are provided. A magnetic recording apparatus, which is excellent in thermal stability and which makes it possible to perform the high density recording, is provided. When films are formed for the magnetic recording medium based on the perpendicular magnetic recording method, the content of B in a seed layer is made sufficiently larger than the content of B in a recording layer. Accordingly, B is diffused from the seed layer to the recording layer to facilitate the segregation of B at the crystal grain boundary in the recording layer. Thereby, the magnetic interaction between the crystal grains in the recording layer is further reduced. Thus, it is possible to greatly reduce the transition noise.

Magnetic recording medium, method for producing the same, and magnetic recording apparatus

A magnetic recording medium comprises an information-recording film and a ferromagnetic film on a substrate. The information-recording film is composed of, for example, an amorphous ferrimagnetic material having perpendicular magnetization. Further, the ferromagnetic film is composed of a magnetic material which has saturation magnetization larger than that of the information-recording film. Accordingly, the leak magnetic flux from the ferromagnetic film is larger than that from the information-recording film. The magnetic recording medium and a magnetic recording apparatus are obtained, which are excellent in thermal stability and which are preferred to perform super high density recording.

Magnetic recording medium with high thermal stability, method for producing the same, and magnetic recording apparatus

A magnetic recording mediumcomprises, on a substrate, a soft magnetic layer, a seed layer, and a recording layerhaving an artificial lattice structure. The seed layeris formed of Pd and one selected from the group consisting of Si, B, C, and Zr. Accordingly, the magnetic exchange coupling force of the recording layerin the in-plane direction can be weakened. Minute recording magnetic domains can be formed in the recording layer, and the magnetization transition area is distinct as well. Thus, the medium noise is reduced. That is, reproduction can be performed with a low medium noise even when information is recorded at a high density. A magnetic storage apparatus, which is provided with the magnetic recording medium as described above, can achieve an areal recording density of 150 Gigabits/square inch.

Magnetic recording medium, method for producing the same, and magnetic storage apparatus

A magnetic recording medium comprises, on a substrate, a soft magnetic layer, a first seed layer, a second seed layer, and a recording layer having an artificial lattice structure. The first seed layer contains oxide of Fe. The second seed layer contains one of Pd and Pt, Si, and N. The magnetic exchange coupling force in the in-plane direction of the recording layer is weakened by the first seed layer and the second seed layer. Accordingly, minute recording magnetic domains can be formed in the recording layer, and the magnetization transition area is distinct as well. Even when information is recorded at a high density, the information can be reproduced with low noise. A magnetic storage apparatus, which is provided with such a magnetic recording medium, makes it possible to achieve an areal recording density of 150 gigabits/square inch.

An amorphous magnetic recording medium comprising a substrate and an amorphous magnetic layer, where a magnetic domain formation-controlling layer comprising a main phase and 1 to 3 kinds of discrete spherical isolating phases arranged horizontally in lines in the main phase or 1 to 3 kinds of discrete spherical phases vertically stacked one upon another in the main phase is formed on the top side or the bottom side directly or through at least one of other layers to bring the amorphous magnetic layer into a finer magnetic domain structure, can satisfy high density recording.

Amorphous magnetic recording medium, process for producing the same and magnetic recording and reproduction apparatus

A continuous plasma CVD apparatus, characterized in that frequency of high-frequency bias is in the range of 50-900 KHz, a blocking condenser is provided between a thin film and a high-frequency source so that the product C&middot;f of electrostatic capacity C of the blocking condenser and frequency f of the high-frequency source is 0.02 &lsqb;F&middot;Hz&rsqb; or more, and the total of impedances of all the rollers provided in the route of from a substrate unwind roller to a rotating drum is 10 k&OHgr; or more and the total of impedances of all the rollers provided in the route of from the rotating drum to a wind roller is 10 k&OHgr; or more. According to this apparatus, it becomes possible to continuously form a film without causing damage and deterioration of the substrate.

Plasma CVD apparatus

A continuous plasma CVD apparatus, characterized in that frequency of high-frequency bias is in the range of 50-900 KHz, a blocking condenser is provided between a thin film and a high-frequency source so that the product C.multidot.f of electrostatic capacity C of the blocking condenser and frequency f of the high-frequency source is 0.02 [F.multidot.Hz] or more, and the total of impedances of all the rollers provided in the route of from a substrate unwind roller to a rotating drum is 10 k.OMEGA. or more and the total of impedances of all the rollers provided in the route of from the rotating drum to a wind roller is 10 k.OMEGA. or more. According to this apparatus, it becomes possible to continuously form a film without causing damage and deterioration of the substrate.

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Moriya, Japan

Akira Yano