Laminated Patents (Class 360/125.24)
  • Patent number: 8958176
    Abstract: The present invention generally relates to a write head pole laminate structure. The write head pole structure can include multiple multi-layer magnetic structures that are separated by a non-magnetic material that is amorphous or microcrystalline. Each multi-layer magnetic structure includes one or more first magnetic layers that are spaced from one or more second magnetic layers by a non-magnetic layer such that the one or more first magnetic layers are substantially identical to the one or more second magnetic layers. In such a design, the one or more second magnetic layers are antiparallel to the one or more first magnetic layers so that a zero total net magnetic moment is present for the multi-layer magnetic structure when current is removed from the write head pole.
    Type: Grant
    Filed: December 22, 2010
    Date of Patent: February 17, 2015
    Assignee: HGST Netherlands B.V
    Inventors: Jeffrey R. Childress, Alexander M. Zeltser
  • Patent number: 8929028
    Abstract: A perpendicular magnetic write head having a laminated trailing return pole structure that reduces magnetic eddy currents in the return pole for improved write head efficiency. The trailing magnetic return pole includes multiple magnetic layers. Each magnetic layer is separated from an adjacent magnetic layer of the return pole by a non-magnetic layer. The non-magnetic layer terminates at a region that is removed from the air bearing surface in order to allow contact between the magnetic layers at the ABS, thereby preventing stray magnetic fields from emitting from the magnetic layers of the write pole.
    Type: Grant
    Filed: December 21, 2010
    Date of Patent: January 6, 2015
    Assignee: HGST Netherlands B.V.
    Inventors: Wen-Chien D. Hsiao, Yimin Hsu, Jennifer Leung
  • Patent number: 8824102
    Abstract: A thin-film magnetic head includes a main magnetic pole layer, write shield layer, gap layer, and thin-film coils, which are laminated on a substrate. A return magnetic pole layer is spaced from the medium-opposing surface on the side opposite to the write shield layer with the main magnetic pole layer intervening therebetween. A connecting magnetic layer is formed using a magnetic material to connect the return magnetic pole layer to the write shield layer on the side closer to the medium-opposing surface than is the thin-film coil. The thin-film coil is wound as a flat spiral around the write shield layer. A part of the thin-film coil wound as the flat spiral is disposed only at a position distanced from the substrate than is the main magnetic pole layer.
    Type: Grant
    Filed: May 3, 2011
    Date of Patent: September 2, 2014
    Assignees: Headway Technologies, Inc., Sae Magntics (H.K.) Ltd.
    Inventors: Yoshitaka Sasaki, Hiroyuki Ito, Shigeki Tanemura, Kazuki Sato, Atsushi Iijima
  • Patent number: 8282843
    Abstract: A method of manufacturing a perpendicular magnetic head having a writing element that writes magnetic information to a recording medium includes forming a main magnetic pole part generating a magnetic field on a substrate; removing at least a part of the substrate and a material existing at a circumference of the main magnetic pole part to expose an entire circumference of the main magnetic pole part at a surface that becomes an opposing medium surface (ABS) opposite to the recording medium; forming a shield gap film that is made of a nonmagnetic material so as to cover the entire circumference of the main magnetic pole part at least at the surface that becomes the ABS; and forming a shield layer so as to cover an entire circumference of the shield gap film at least at the surface that becomes the ABS.
    Type: Grant
    Filed: November 10, 2009
    Date of Patent: October 9, 2012
    Assignee: TDK Corporation
    Inventors: Tatsuhiro Nojima, Hisayoshi Watanabe, Masachika Hashino
  • Patent number: 8125733
    Abstract: A perpendicular magnetic recording head includes a main magnetic pole layer; and a return yoke layer laminated on the main magnetic pole layer with a magnetic gap layer formed of a nonmagnetic material disposed on an opposing surface opposite a recording medium. The return yoke layer includes a first throat part opposing the main magnetic pole layer at a side close to the recording medium-opposing surface with a first gap spacing corresponding to a film thickness of the magnetic gap layer; and a second throat part extending to a deeper side than the first throat part in a height direction and opposing the main magnetic pole layer with a second gap spacing greater than the first gap spacing. A throat height determining layer is provided on the main magnetic pole layer or the magnetic gap layer, the throat height determining layer defining a dimension of the first throat part of the return yoke layer in the height direction and formed of an inorganic nonmagnetic material.
    Type: Grant
    Filed: February 26, 2008
    Date of Patent: February 28, 2012
    Assignee: TDK Corporation
    Inventors: Hisayuki Yazawa, Kiyoshi Kobayashi
  • Patent number: 7561379
    Abstract: A perpendicular writer includes a surface, a main pole proximate the surface, a return pole proximate the surface, and a back yoke connecting the main pole to the return pole distal the surface. The return pole is configured such that a magnetization of a portion of the return pole adjacent the surface is held substantially parallel to the surface during a write operation.
    Type: Grant
    Filed: October 28, 2005
    Date of Patent: July 14, 2009
    Assignee: Seagate Technology LLC
    Inventors: Shaoping Li, Lei Wang, Chunhong Hou, Song S. Xue, Daniel John Brown
  • Patent number: 7551394
    Abstract: A magnetic head comprises a pole layer, a shield layer, a gap layer disposed between the pole layer and the shield layer, and a coil. The shield layer incorporates a first layer, a second layer, a third layer and a fourth layer that are disposed on the gap layer one by one. The first layer has an end face located in a medium facing surface. The second layer has: a first surface located in the medium facing surface; a second surface touching the first layer; and a third surface opposite to the second surface. The third layer touches the third surface of the second layer. An end face of each of the third and fourth layers closer to the medium facing surface is located at a distance from the medium facing surface.
    Type: Grant
    Filed: July 12, 2006
    Date of Patent: June 23, 2009
    Assignees: Headway Technologies, Inc., SAE Magnetics (H.K.) Ltd.
    Inventors: Yoshitaka Sasaki, Hiroyuki Itoh, Shigeki Tanemura, Hironori Araki, Dong-Hong Li, Tatsushi Shimizu, Tatsuya Shimizu
  • Patent number: 7485378
    Abstract: A magnetic film capable of generating strong magnetic fields even in a high frequency region, a manufacturing method therefore and a thin film magnetic head capable of recording even in a high frequency region are provided. In one embodiment, the magnetic film is manufactured by using a 88FeNi film of 200 nm thick having minimum Hk of 0.32 Oe (25.6 A/m) as a main magnetic film and selecting a 20 wt % FeNi film of a similar FeNi alloy plating film having low Hk and low Hc as an interlayer material. A stacked film comprising (88FeNi/20FeNi)×10 layers is prepared so that the total thickness of the main magnetic film is 2 ?m. The 88FeNi film is prepared by application of a DC current in a 88FeNi plating bath, and the 20FeNi film is prepared by pulse plating successively in the same bath.
    Type: Grant
    Filed: March 18, 2005
    Date of Patent: February 3, 2009
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Gen Oikawa, Kazue Kudo, Youji Maruyama, Hiromi Shiina
  • Patent number: 7463450
    Abstract: A thin film magnetic head has a configuration in which a main magnetic pole film having a magnetic pole end portion on a medium opposing surface (ABS) side facing a magnetic disk, a write shield film facing the magnetic pole end portion so as to form a recording gap film on the medium opposing surface side, and a thin film coil wound around at least a part of the write shield film are laminated. Further, the thin film magnetic head has an upper yoke magnetic pole film whose size is larger than that of the main magnetic pole film at a part more distant from the ABS than the recording gap film, and this upper yoke magnetic pole film is bonded to the side of the main magnetic pole film close to the thin film coil. In the upper yoke magnetic pole film, an end portion on the ABS side is retracted in a direction apart from the ABS in accordance with an increase in film thickness which is measured from the surface of the main magnetic pole film.
    Type: Grant
    Filed: May 23, 2005
    Date of Patent: December 9, 2008
    Assignees: Headweay Technologies, Inc., Sae Magnetics (H.K.) Ltd.
    Inventors: Yoshitaka Sasaki, Hiroyuki Itoh, Takehiro Kamigama, Tatsushi Shimizu
  • Patent number: 7453668
    Abstract: The present invention provides a method of manufacturing a thin film magnetic head capable of assuring recording characteristics by determining throat height with high precision. A TH specifying layer is formed so as to extend to a position P1 while being adjacent to a gap layer, and an auxiliary insulating layer is similarly formed so as to extend from the position P1 while being adjacent to the gap layer and specify throat height on the basis of the position P1. After that, a main insulating layer is formed so as to cover a thin film coil on the auxiliary insulating layer, and a yoke layer is formed so as to extend while being partially on the TH specifying layer. The throat height is determined accurately and stably on the basis of the position P1 by the auxiliary insulating layer.
    Type: Grant
    Filed: October 18, 2005
    Date of Patent: November 18, 2008
    Assignee: TDK Corporation
    Inventors: Susumu Aoki, Reiichi Kurumisawa, Norikazu Ota, Yasuyuki Notsuke, Yuichi Watabe
  • Publication number: 20080112081
    Abstract: The present invention provides a perpendicular magnetic write head capable of preventing unintended erasure of information due to spread of a magnetic field for writing. A leading shield, two side shields, and a trailing shield are disposed around (a front end portion of) a main magnetic pole layer. A nonmagnetic layer having a uniform thickness formed by ALD is provided between the front end portion and two side shields. Consequently, intervals are constant in any positions. Spread of magnetic fields for recording in a write track width direction is suppressed sufficiently more than the case where the intervals vary among positions.
    Type: Application
    Filed: November 8, 2007
    Publication date: May 15, 2008
    Applicant: SAE MAGNETICS (H.K.) LTD.
    Inventor: Naoto Matono