Hitachi, Ltd.

Hitachi Global Storage Technologies Japan, Ltd.

Hitachi Global Storage Technologies Netherlands B.v.

Canon Kabushiki Kaisha

Hitachi Global Storage Technologies

Canon Kasei Kabushiki Kaisha

Naoki Koyama

Isamu Yuito

Kazuo Shiiki

Toshio Kobayashi

Hisashi Takano

Hideo Tanabe

Eijin Moriwaki

Masahiro Kitada

Noboru Shimizu

Ryoichi Nakatani

Masaaki Futamoto

Yoshibumi Matsuda

Mikio Suzuki

Kyo Akagi

Takeshi Nakao

Yoshinori Miyamura

Fumio Kugiya

Hirotsugu Fukuoka

Takayuki Munemoto

Tokuho Takagaki

Hideo Todokoro

Tohru Ishitani

Tsuyoshi Ohnishi

Chiaki Ishikawa

Makoto Morijiri

Shinobu Sasaki

Tomohiro Okada

Tadayuki Iwakura

Tetsuya Okai

Hiroshi Umezaki

Harunobu Saito

Yutaka Sugita

Shuichi Kojima

Yoshihiro Hamakawa

Takashi Kawabe

Kouji Okazaki

Izuru Ishii

Ryo Suzuki

Satoshi Shigematsu

Masatoshi Takeshita

Fusaji Shoji

Kanji Kawakami

Koichi Nishioka

Shigeru Tadokoro

Norikazu Tsumita

Haruhiko Matsuyama

Tooru Takeura

Norihiro Ookawa

Yooji Maruyama

Youji Maruyama

Masatoshi Arasawa

Erika Umeki

Ryuta Urano

Isamu Yuitoo

Azusa Hori

Yukimasa Okada

Yoozi Maruyama

A tunnel magnetoresistance effect magnetic head having between magnetic shield layers, an antiferromagnetic layer, a pinned layer which has the direction of magnetization pinned by exchange coupling with the antiferromagnetic layer, an insulating layer, and a free layer whose direction of magnetization rotates relatively to external magnetic fields, wherein the antiferromagnetic layer is of an antiferromagnetic substance composed mainly of IrMn, the pinned layer is made up of a first pinned layer of CoFe alloy in contact with the antiferromagnetic layer and a second pinned layer of CoFeB alloy which is antiferromagnetically coupled with the first pinned layer, and the first and second pinned layers have the amount of magnetization such that the difference M1&#x2212;M2 is in the range of 0&#x3c;M2&#x2212;M1&#x3c;0.5 (nm&#xb7;T) and also have the magnetostriction constants such that the difference |&#x3bb;1&#x2212;&#x3bb;2| is no larger than 5.0&#xd7;10.

Magnetic head of magnetoresistance effect type with high resistance to external stress

A conductive rubber roller comprising a conductive core material and provided thereon a rubber layer; the rubber layer being formed by using a rubber composition containing as rubber components at least a polar rubber and an ethylene oxide-propylene oxide-allyl glycidyl ether terpolymer; the ethylene oxide-propylene oxide-allyl glycidyl ether terpolymer having a melt peak temperature of from 20 to 30&#xb0; C. and a melt enthalpy change &#x394;H of from 40 to 70 mJ/mg as measured with a differential scanning calorimeter; and the allyl glycidyl ether in the ethylene oxide-propylene oxide-allyl glycidyl ether terpolymer being in a copolymerization ratio of from more than 10 mol % to 20 mol % or less.

Conductive rubber roller

In one embodiment, a seed layer, an underlayer, and a magnetic domain control layer are laminated on both sides of a magnetoresistive sheet unit. A lower electrode film is thinly formed on an upper portion of the magnetic domain control film. A portion of the lower electrode film near the magnetoresistive sheet unit does not protrude substantially from an upper surface of the magnetoresistive sheet unit. Should the portion protrude, a step from the upper surface of the magnetoresistive sheet unit is about 14 nm or less. This portion and the upper surface of the magnetoresistive sheet unit are formed into a flat surface. An upper electrode film is formed thickly on an upper portion of the lower electrode film on an outside thereof so as to circumvent the flat surface. A protective layer, an upper gap film, and an upper magnetic shield film are also formed.

Magnetoresistive head and fabricating method thereof, and read write separation type head

Even if the track and gap widths are made narrow in a read head, a narrow track head has so far been unable to afford satisfactory off-track characteristics because of a wide shield spacing over electrodes. The invention provides a magnetic head wherein, in the height direction of a magnetoresistive element, the spacing between an upper magnetic shield and a lower magnetic shield at an air bearing surface is narrower than the spacing between the upper and lower magnetic shields formed over a thickest portion of each of electrodes in contact with associated magnetic domain control layers.

Magnetic head with a narrow spacing between magnetic shields at air bearing surface

Disclosed is a magnetic disk apparatus including a magnetic reproducing head portion, and a magnetic recording head including an upper magnetic core having a end portion and a rear portion. As a resist for a frame which is used for forming the rear portion, a negative resist or an electron beam resist is used, whereby the frame is formed without any adverse effect of halation from a coil insulating film. That is, it is possible to manufacture a magnetic recording head in which the rear portion of an upper magnetic core is not emerged at the face opposed to a medium, and hence to obtain a magnetic disk apparatus exhibiting an areal recording density of 5 Gbit/inor more by mounting a magnetic recording/reproducing head including such a magnetic recording head.

Thin film magnetic head and magnetic disk apparatus including the same

The magnetoresistance effect element is of a multilayered structure having at least magnetic layers and an intermediate layer of an insulating material, a semiconductor or an antiferromagnetic material against the magnetic layers, and the magnetoresistance effect element has terminals formed at least on the opposite magnetic layers, respectively, so that a current flows in the intermediate layer. The film surfaces of all the magnetic layers constituting the magnetoresistance effect element are opposed substantially at right angles to the recording surface of a magnetic recording medium. Therefore, the area of the magnetic layers facing the recording surface of the magnetic recording medium can be extremely reduced, and thus the magnetic field from a very narrow region of the high-density recorded magnetic recording medium can be detected by the current which has a tunneling characteristic and passes through the intermediate layer.

Method for manufacturing magnetic head device

Magnetic apparatus with perpendicular recording medium and head having multilayered reproducing element using tunneling effect

A magnetic disk apparatus includes a magnetic reproducing head portion, and a magnetic recording head including a lower magnetic core and an upper magnetic core having a end portion and a rear portion. The rear portion is formed using a negative resist or an electron beam resist to form a frame for plating above the end portion of the upper magnetic core head.

Manufacturing method of a thin film magnetic head

In a composite magnetic head comprising a magnetoresistive read head including a magnetic thin film having a magnetoresistive effect and soft magnetic members interposing the soft magnetic film between them through a non-magnetic insulation layer, an induction type write head including poles formed in a moving direction of a medium and a conductor crossing the poles, and disposed in the proximity of the magnetoresistive head, and a substrate supporting these heads, the present invention discloses a composite magnetic head characterized in that part of a floating surface inclusive of the magnetic head constituent members has recesses and the read/write operations to and from the medium are effected by the portion interposed by these recesses.

Combination perpendicular magnetic head having shield material formed at both ends of an upper pole of a write element

The magnetoresistance effect element is of a multilayered structure having at least magnetic layers and an intermediate layer of an insulating material, a semiconductor or an antiferromagnetic material against the magnetic layers, and the magnetoresistance effect element has terminals formed at least on the opposite magnetic layers, respectively, so that a all the magnetic layers constituting the magnetoresistance effect element are opposed substantially at right angles to the recording surface of a magnetic recording medium. Therefore, the area of the magnetic layers facing the recording surface of the magnetic recording medium can be extremely reduced, and thus the magnetic field from a very narrow region of the high-density recorded magnetic recording medium can be detected by the current which has a tunneling characteristic and passes through the intermediate layer.

Magnetic head with conductors formed on endlayers of a multilayer film having magnetic layer coercive force difference

Magnetic head having track width defined by trench portions filled with magnetic shield material

In a composite magnetic head comprising a magnetoresistive read head including a magnetic thin film having a magnetoresistive effect and soft magnetic members interposing the soft magnetic film between them through a non-magnetic insulation layer, an induction type write head-including poles formed in a moving direction of a medium and a conductor crossing the poles, and disposed in the proximity of the magnetoresistive head, and a substrate supporting these heads, the present invention discloses a composite magnetic head characterized in that part of a floating surface inclusive of the magnetic head constituent members has recesses and the read/write operations to and from the medium are effected by the portion interposed by these recesses.

Method of fabricating a magnetic head by focused ion beam etching

Magnetic disk apparatus including magnetic head having multilayered reproducing element using tunneling effect

Disclosed is a magnetic disk apparatus including a magnetic reproducing head portion, and a magnetic recording head including an upper magnetic core having a end portion and a rear portion. As a resist for a frame which is used for forming the rear portion, a negative resist or an electron beam resist is used, whereby the frame is formed without any adverse effect of halation from a coil insulating film. That is, it is possible to manufacture a magnetic recording head in which the rear portion of an upper magnetic core is not emerged at the face opposed to a medium, and hence to obtain a magnetic disk apparatus exhibiting an areal recording density of 5 Gbit/in or more by mounting a magnetic recording/reproducing head including such a magnetic recording head.

Growing community of inventors

Kokubunji, Japan

Naoki Koyama