Tdk Corporation

Nec Corporation

Hoya Corporation

Sae Magnetics (h.k.) Limited

Katsumichi Tagami

Yoshikazu Soeno

Tohru Oikawa

Kazuya Shimakawa

Shinzo Tsuboi

Hiroki Matsukuma

Hirotaka Hokkyo

Tomoyuki Sasaki

Keiji Koga

Mitsuru Takai

Koji Shimazawa

Norikazu Ota

Kazumasa Fukuda

Tsuyoshi Umehara

Nobuya Oyama

Soji Koide

Yoshiyuki Mizoguchi

Kazuhide Yamada

Makoto Yoshida

Tetsuya Roppongi

Naoto Matono

Susumu Aoki

Hiroshi Kiyono

Shuichi Okawa

Takahiro Suwa

Shunji Saruki

Tatsuya Harada

Makoto Moriya

Akimasa Kaizu

Tetsuya Kuwashima

Kazuhiko Maejima

Kenji Inage

Hiroshi Kamiyama

Mitsuyoshi Kawai

Katsumi Suemitsu

Yuuichi Kawaguchi

Toshikazu Hosobuchi

Masahide Kohno

Tohru Oiakawa

Masaki Kubota

An object of the present invention is to provide a silicon spin transport device manufacturing method and silicon spin transport device whereby improved voltage output characteristics can be obtained. The silicon spin transport device manufacturing method comprises: a first step of patterning a silicon film by wet etching and forming a silicon channel layer; and a second step of forming a magnetization free layer and a magnetization fixed layer, which are apart from each other, on the silicon channel layer.

Manufacturing method of silicon spin transport device and silicon spin transport device

A spin transport device which comprises a channel, first and second insulating layers, a magnetization fixed layer, a magnetization free layer, first and second wirings, and satisfies at least one of following conditions A and B, Condition A: The first wiring includes a vertical portion which extends in a thickness direction of the magnetization fixed layer on the magnetization fixed layer, and a horizontal portion which extends from the vertical portion that is apart from the magnetization fixed layer side in a direction crossing the thickness direction of the magnetization fixed layer, and Condition B: The second wiring includes a vertical portion which extends in a thickness direction of the magnetization free layer on the magnetization free layer, and a horizontal portion which extends from the vertical portion that is apart from the magnetization free layer side in a direction crossing the thickness direction of the magnetization free layer.

Spin transport device

A spin transport device is provided, which includes a channel comprised of a semiconductor material, a magnetization fixed layer arranged on the channel via a first insulating layer, a magnetization free layer arranged on the channel via a second insulating layer, and first and second electrodes arranged on the channel, wherein carrier densities of a first region of the channel including a contact surface with the first insulating layer, a second region of the channel including a contact surface with the second insulating layer, a third region of the channel including an opposite surface to the first electrode, and a fourth region of the channel including an opposite surface to the second electrode are higher than an average carrier density of the whole channel. Accordingly, a spin transport device that can realize good spin transportation and electric resistance characteristics while suppressing the scattering of spin can be provided.

A TMR effect element with sufficiently reduced element resistance and restricted popping noise is provided, which comprises a tunnel barrier layer formed primarily of a metal oxide including many electric charge sites. The electric charge sites density n and the mobility &#x3bc; of electrons trapped due to the electric charge sites satisfy a relationship expressed by: 0&#x3c;(n&#x2212;n)&#xb7;(&#x3bc;&#x2212;&#x3bc;)&#xb7;(n&#x3bc;)&#x3c;0.2, where nand nare densities of tunnel electrons when an element resistance is a minimum and maximum respectively during reading signals and &#x3bc;is the mobility of electrons when not trapped.

Tunnel magnetoresistive effect element with limited electric popping output voltage

A thin-film magnetic head that has a configuration in which the element-formed surface and the opposed-to-medium surface are perpendicular to each other, and a light source is sufficiently distanced from the medium surface is provided. The head comprises at least one near-field-light-generating layer for heating a part of a magnetic medium during write operation by generating a near-field light, having a shape tapered toward a head end surface on the opposed-to-medium surface side, and comprising a near-field-light-generating portion having a light-received surface and a tip reaching the head end surface on the opposed-to-medium surface side, and the light-received surface being sloped in respect to the element-formed surface and being provided in a position where an incident light propagating from a head end surface opposite to the opposed-to-medium surface can reach at least a part of the light-received surface.

Thin-film magnetic head with near-field-light-generating layer

The magnetic recording and reproducing apparatus includes: a perpendicular recording magnetic recording medium including a track pattern including track portions and gap portions arranged so as to be alternately adjacent to each other in a cross-track direction, at least part of portions corresponding to the track portions being recording areas having the width substantially the same as the width of the track portions, portions between the recording areas being non-recording areas; and a magnetic head of a perpendicular recording type for applying a recording magnetic field to the recording areas. The anisotropic magnetic field Hk (T) of the recording areas of the magnetic recording medium and the recording magnetic field intensity Fw (t) of the recording magnetic field at the upper surface of the recording areas satisfy the following inequality (I):0.23&#xd7;+1.2&#x2266;&#x2266;0.26&#xd7;+1.6.&#x2003;&#x2003;(I)

Magnetic recording and reproducing apparatus including a magnetic recording medium and a magnetic head for recording data on the magnetic recording medium

A stamper manufacturing method comprises: forming a stamper body so as to have a concave/convex pattern on one surface and a crystalline structure on at least a side toward the other surface; forming a layer having an amorphous structure on the other surface side of the stamper body; and polishing a surface of the layer having the amorphous structure. A resin molded article manufacturing method includes an injection molding process using the stamper as a prototype so as to transfer the concave/convex pattern of the stamper to a resin material. A stamper comprises a stamper body which is formed so as to have a concave/convex pattern on one surface and have a crystalline structure on at least a side toward the other surface. In the stamper, a layer having an amorphous structure and a surface of which is polished is formed on the other surface side of the stamper body.

Method of manufacturing stamper, method of manufacturing resin molded article, and stamper

A thin-film magnetic head for a heat-assisted magnetic recording which can perform a reliable writing immediately only on a desired track by applying a near-field light to a desired position and range is provided. The head comprises: an electromagnetic coil element for writing data signals, having a pole end reaching a head end surface; and a near-field-light-generating portion for heating a portion of a magnetic recording medium during write operation by generating a near-field light, having a generation end reaching the head end surface and provided adjacent to the pole end and in the leading side of the pole end, and a shape of the generation end on the head end surface being a trapezoid with a shorter edge on the trailing side, or being a triangle with an apex on the trailing side and with a bottom on the leading side.

Thin-film magnetic head having near-field-light-generating portion with trapezoidal end

An information recording medium excellent in surface smoothness. The information recording medium has a data track pattern and a servo pattern formed on at least one surface of a substrate by a concave/convex pattern including a plurality of convex portions. The concave/convex pattern has concave portions each having a non-magnetic material embedded therein. An A concave/convex pattern forming the servo pattern includes a plurality of servo convex portions formed in a manner associated with servo data. At least part of the plurality of servo convex portions are formed by a B concave/convex pattern including a plurality of non-servo convex portions. This arrangement makes it possible to maintain excellent surface smoothness within a servo pattern area, thereby enabling the recording/reproducing apparatus to execute stable recording and reproducing on and from the information recording medium.

Information recording medium and recording/reproducing apparatus

A thin-film magnetic head that shows stable read and/or write performances, maintaining the reliability over time by suppressing the wear of the head sufficiently, is provided. The head comprises: a substrate having an element-formed surface and an opposed-to-medium surface; a magnetic head element; an overcoat layer formed on the element-formed surface so as to cover the magnetic head element; a closure provided on the overcoat layer, a surface of the closure being in contact with the upper surface of the overcoat layer; and an element contact pad formed in a sliding-side surface of the head and having a contact surface including a part of the opposed-to-medium surface, a part of an end surface of the overcoat layer and a part of an end surface of the closure, one end of the magnetic head element reaching the contact surface.

Thin-film magnetic head comprising contact pad including portions of closure and substrate and magnetic recording apparatus comprising the head

A magnetic storage device is provided which has significantly reduced power consumption. The magnetic storage device includes: a yoke which is arranged so as to cover part of a line extending in an arbitrary direction; and a magneto-resistive element which is arranged near the line and is capable of writing information using a field occurring from the line. The magnetic storage device is set to satisfy the equation Iw&#x2266;a&#xb7;R+b, where Iw is the write current necessary for the line, R is the magnetoresistance of the yoke, a (mA&#xb7;H)=7.5E&#x2212;11, and b (mA)=0.1.

Magnetic storage device

A magnetic storage device with a significant reduction in power consumption. The magnetic storage device includes: a yoke which is arranged to cover part of a line extending in an arbitrary direction; and a magneto-resistive element which is arranged in contact with the yoke, thereby forming a closed magnetic circuit. The magneto-resistive element is capable of writing information with a field emanating from the yoke. The magnetic storage device satisfies Iw&#x2266;a&#xb7;R, where R is the magnetoresistance of the yoke, Iw is the write current necessary for the line, and a (mA&#xb7;H)=6E&#x2212;11.

The present invention relates to a thin-film magnetic head with a heater. A thin-film magnetic head includes a substrate, a magnetic read head element that has a shield area and is formed on the substrate, a magnetic write head element that has a pole area and is formed on the opposite side of the substrate with respect to the magnetic read head element, an overcoat layer that covers the magnetic read head element and the magnetic write head element and is formed on the substrate, a heater that heats at least during the magnetic read head element or the magnetic write head element in operation and is formed in the overcoat layer, and a slit area that splits the shield area in a shield length direction and is made of lower thermal conductivity material than the one of the shield area.

Thin-film magnetic head with heater spaced further from medium facing surface than split in shield

A magnetic memory is provided in which the margin between a write current and a read current can be reduced. A magnetic storage element includes: a first magnetic layer in which the direction of magnetization can be reversed; a second magnetic layer in which the direction of magnetization is fixed; and a non-magnetic layer which is interposed between the first and second magnetic layers. The write current and the read current are supplied to the magnetic storage element in the stacking direction thereof through a read-write line. Moreover, a bias line which can apply a bias magnetic field to the first magnetic layer during a reading operation is disposed in the vicinity of the magnetic storage element.

Magnetic memory and method for reading-writing information from-to magnetic storage element

A magnetic storage device is provided which has significantly reduced power consumption. In the magnetic storage device, a yoke is arranged so as to circumferentially surround part of a line extending in an arbitrary direction, and a magneto-resistive element to which information can be written by utilizing a magnetic field generated by the line is arranged in the vicinity of the line. In this case, the length of the magnetic path of the yoke is set to 6 &#x3bc;m or less.

Growing community of inventors

Tokyo, Japan

Katsumichi Tagami