Inventor · disambiguated record
Ikuya Tagawa
Also filed as: TAGAWA IKUYA
34 granted patents·6 pending applications·473 citations·filing 1997–2018
97Inventor score
Files withFUJITSU LTD23HITACHI GLOBAL STORAGE TECH7HGST Netherlands BV6HITACHI GLOBAL STORAGE TECH NL1JOHNS WILLIAM D1
Top patents by PatentIndex Score
40 records- 0195US8995088B1Heat sink for a spin torque oscillator (STO) in microwave assisted magnetic recording (MAMR)HGST Netherlands BV·Filed 2013·Granted Mar 31, 2015·54 cites·20 claims
- 0294US8570684B1Implementing integrated spin-torque oscillator and interface bias control for hard disk drivesHGST Netherlands BV·Filed 2012·Granted Oct 29, 2013·25 cites·22 claims
- 0393US8917465B1Implementing spin torque oscillator power-on oscillation checker using ramped STO bias differentiator in microwave-assisted magnetic recording (MAMR) hard disk drivesHGST Netherlands BV·Filed 2014·Granted Dec 23, 2014·22 cites·20 claims
- 0492US9355668B2Hard disk drive with contact detection using a spin torque oscillatorHGST Netherlands BV·Filed 2013·Granted May 31, 2016·16 cites·14 claims
- 0592US7450349B2Magnetic head with soft magnetic shield and magnetic storageHITACHI GLOBAL STORAGE TECH·Filed 2005·Granted Nov 11, 2008·16 cites·18 claims
- 0691US8848317B2Magnetic data recording system with mirror image asymmetric magnetic write elementsHGST Netherlands BV·Filed 2012·Granted Sep 30, 2014·15 cites·15 claims
- 0791US7518825B2Thin film magnetic head wherein at least one of a return pole, a first shield, and a second shield has a reverse taperHITACHI GLOBAL STORAGE TECH·Filed 2005·Granted Apr 14, 2009·13 cites·17 claims
- 0891US6510024B2Magnetic head and method of manufacturing the sameFUJITSU LTD·Filed 2001·Granted Jan 21, 2003·34 cites·2 claims
- 0990US8760779B2Energy-assisted magnetic recording head and systems thereof with environmental conditions controlJOHNS WILLIAM D·Filed 2011·Granted Jun 24, 2014·25 cites·19 claims
- 1089US8553507B1Write track shift control in shingled-microwave-assisted magnetic recording (MAMR-SMR)HGST Netherlands BV·Filed 2012·Granted Oct 8, 2013·11 cites·17 claims
- 1188US7830631B2Controlling an overshoot amplitude level based on a recording data pattern in a magnetic disk driveHITACHI GLOBAL STORAGE TECH·Filed 2007·Granted Nov 9, 2010·9 cites·12 claims
- 1285US6828046B2Soft magnetic film of FeCoMO having a high saturation flux density, a moderate soft magnetism and a uniaxial magnetic anisotropyFUJITSU LTD·Filed 2001·Granted Dec 7, 2004·19 cites·21 claims
- 1382US5920449ARecording head for single layer magnetic film perpendicular magnetization mediumFUJITSU LTD·Filed 1997·Granted Jul 6, 1999·38 cites·9 claims
- 1481US8643972B2Magnetic storage apparatus, head drive controller, and head drive control methodSHIROISHI YOSHIHIRO·Filed 2012·Granted Feb 4, 2014·8 cites·24 claims
- 1580US6751052B1Thin film magnetic head with short lower magnetic pole pieceFUJITSU LTD·Filed 2000·Granted Jun 15, 2004·16 cites·20 claims
- 1680US6614620B2Thin film magnetic headFUJITSU LTD·Filed 2001·Granted Sep 2, 2003·15 cites·13 claims
- 1776US7468852B2Method of demagnetizing magnetic recording medium and apparatus for carrying out sameHITACHI GLOBAL STORAGE TECH·Filed 2006·Granted Dec 23, 2008·3 cites·19 claims
- 1872US6822831B2Magnetic thin film, magnetic thin film forming method, and recording headFUJITSU LTD·Filed 2002·Granted Nov 23, 2004·13 cites·8 claims
- 1971US6970324B2Thin film head with nickel-iron alloy non-magnetic substratum between non-magnetic gap layer and upper magnetic pole layerFUJITSU LTD·Filed 2002·Granted Nov 29, 2005·12 cites·9 claims
- 2071US6567239B1Thin film magnetic head including a coil insulating resin filler and an insulating metallic layer covering at least partly the insulating resin filler on a datum planeFUJITSU LTD·Filed 2000·Granted May 20, 2003·12 cites·6 claims
- 2170US6624972B1Magnetic head, method of manufacturing magnetic head and information recording apparatusFUJITSU LTD·Filed 2000·Granted Sep 23, 2003·8 cites·7 claims
- 2268US6094325ASpin valve head reducing barkhausen noiseFUJITSU LTD·Filed 1998·Granted Jul 25, 2000·20 cites·7 claims
- 2367US6002555AThin film magnetic headFUJITSU LTD·Filed 1998·Granted Dec 14, 1999·19 cites·12 claims
- 2466US7016149B2Recording magnetic head and magnetic storage device using the sameFUJITSU LTD·Filed 2002·Granted Mar 21, 2006·6 cites·10 claims
- 2565US6282776B1Magnetic head and method of manufacturing the sameFUJITSU LTD·Filed 1998·Granted Sep 4, 2001·18 cites·9 claims
- 2663US6507448B2Information recording device having a function of erasing information in a standby stateFUJITSU LTD·Filed 2000·Granted Jan 14, 2003·5 cites·6 claims
- 2761US6813824B2Method of producing thin film magnetic headFUJITSU LTD·Filed 2002·Granted Nov 9, 2004·7 cites·5 claims
- 2859US6876524B2Magnetoresistive transducer having stronger longitudinal bias fieldFUJITSU LTD·Filed 2001·Granted Apr 5, 2005·8 cites·11 claims
- 2951US7486485B2Perpendicular hard disk drive resistive against external magnetic fieldHITACHI GLOBAL STORAGE TECH·Filed 2005·Granted Feb 3, 2009·0 cites·20 claims
- 3051US7408738B2Magnetic recording system with improved magnetic shieldHITACHI GLOBAL STORAGE TECH·Filed 2005·Granted Aug 5, 2008·0 cites·20 claims
- 3148US7428115B2Magnetic hard disk drive with countermeasure against spike noiseHITACHI GLOBAL STORAGE TECH·Filed 2005·Granted Sep 23, 2008·0 cites·18 claims
- 3245US6001468AMagnetic headFUJITSU LTD·Filed 1997·Granted Dec 14, 1999·6 cites·10 claims
- 3342US2005135006A1Magnetic headFUJITSU LTD·Filed 2005·Application pending·0 cites
- 3441US6720075B2Magnetic recording medium and magnetic recording medium driver for the medium with N-type ferrimagnetic recording layerFUJITSU LTD·Filed 2002·Granted Apr 13, 2004·0 cites·4 claims
- 3541US2005175864A1Magnetic thin film and magnetic head using the sameFUJITSU LTD·Filed 2005·Application pending·0 cites
- 3640US10283146B2System and method for reading data recorded on ferroelectric storage medium by means of a near-field transducerWESTERN DIGITAL TECH·Filed 2018·Granted May 7, 2019·0 cites·19 claims
- 3740US2011141616A1Magnetic recording head and magnetic disk storage deviceHITACHI GLOBAL STORAGE TECH NL·Filed 2010·Application pending·0 cites
- 3837US2001013992A1Thin film magnetic head with tip sub-magnetic pole and method of manufacturing the sameFUJITSU LTD·Filed 2001·Application pending·0 cites
- 3937US2001043445A1Thin film magnetic head with tip sub-magnetic pole and method of manufacturing the sameFUJITSU LTD·Filed 2001·Application pending·0 cites
- 4037US2002024765A1Thin film magnetic head and magnetic head assembly employing the sameFUJITSU LTD·Filed 2001·Application pending·0 cites
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →