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Inventor

Keiichi Nagasaka

Inventor
Isehara, JP

Overview

38→
Patents
2000–2018
Patent span
Physics
Primary field (CPC G)

Patents· 38 as inventor

Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.

G11Bprimary
G11BInformation storage based on relative movement between record carrier and transducer45%
B82YSpecific uses or applications of nanostructures15%
H01FMagnets9%
H10NElectric solid-state devices not otherwise provided for9%
G01RMeasuring electric variables8%
Y10TTechnical subjects covered by former us classification5%
H03BGeneration of oscillations, directly or by frequency-changing, by circuits employing active elements which operate in a non-switching manner4%
A61KPreparations for medical, dental or toiletry purposes1%
A61MDevices for introducing media into, or onto, the body1%
G06FElectric digital data processing1%
PatentTitleYear
10,037,772Low magnetic flux density interface layer for spin torque oscillator20189,990,943Texture-control layer for spin torque oscillator20189,858,952'Microwave assisted magnetic recording head having spin torque oscillator frequency detection'20189,805,746'Low magnetic flux density interface layer for spin torque oscillator'20179,728,210'Texture-control layer for spin torque oscillator'20179,437,222'Spin torque oscillator with high spin torque efficiency and reliability'20169,406,315'AF-mode STO with negative Hk spin polarization layer'20169,378,759'Spin torque oscillator with low magnetic moment and high perpendicular magnetic anisotropy material'20169,336,797'Extended spin torque oscillator'20169,305,574'Negative-polarization spin-torque-oscillator'20169,230,569'Low Bs spin-polarizer for spin torque oscillator'20169,230,597'Magnetic head having a spin torque oscillator (STO) with a hybrid heusler field generation layer (FGL)'20169,099,107'Stabilizing layer for a spin torque oscillator (STO)'20158,988,826'MAMR head with a multi-layered side gap for stable oscillation of the STO'20158,982,502'Hard disk drive with write assist based on detected conditions'20158,970,996'Spin-torque oscillator for microwave assisted magnetic recording'20158,879,205'High spin-torque efficiency spin-torque oscillator (STO) with dual spin polarization layer'20148,773,822'Spin-torque oscillator for microwave assisted magnetic recording'20148,687,319'Magnetic recording apparatus with magnetic recording head capable of recording information on a magnetic recording medium'20148,547,656'Spin-torque oscillator (STO) for microwave-assisted magnetic recording (MAMR) and methods of use thereof'20138,537,497'Magnetic recording head and magnetic recording/reproducing apparatus'20138,345,380'Spin torque oscillator and magnetic recording head and magnetic recording device mounted with the spin torque oscillator'20137,538,987'CPP spin-valve element'20097,450,351'Magnetoresistive element having current-perpendicular-to-plane structure, magnetic head, and magnetic memory apparatus thereof'20087,433,160'Magnetoresistive element and method of manufacturing the same'20087,428,127'CPP magnetoresistive effect element and magnetic storage device having a CPP magnetoresistive effect element'20087,342,751'Magnetoresistive effect having multiple base layers between an electrode and an antiferromagnetic layer, magnetic head, and magnetic recording device'20087,180,713'Magnetoresistive element'20077,116,533'Magnetoresistive sensor'20067,116,528'Magnetoresistive element having current-perpendicular-to-the-plane structure and having improved magnetic domain control'20066,995,960'Spin valve magnetoresistive sensor having CPP structure'20066,927,952'CPP GMR free layer having ferromagnetic layers with parallel magnetization separated by non-magnetic layer'20056,801,413'Magnetic sensor, magnetic head and magnetic recording apparatus'20046,781,799'Current perpendicular-to-the-plane structure spin valve magnetoresistive head'20046,661,624'Spin-valve magnetoresistive device having a layer for canceling a leakage magnetic field'20036,364,961'Spin-valve magnetic head with the pinned layer having different directions for its magnetization axis and its easy axis'20026,355,115'Spin-valve magnetic head with the pinned layer having different directions for its magnetization axis and its easy axis'20026,034,845'Spin-valve magnetic head with the pinned layer having different directions for its magnetization axis and its easy axis'2000

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

2000–2009Patents assigned to FUJITSU LTD (16)· patent assignee history
2000–2009Based in Kawasaki, JP· patent location history
2013–2018Patents assigned to HGST Netherlands BV (16)· patent assignee history
2013–2015Patents assigned to NAGASAKA KEIICHI (6)· patent assignee history
2013–2014Patents assigned to SHIIMOTO MASATO (5)· patent assignee history
2013–2018Based in Isehara, JP· patent location history
2016Based in Kanagawa, JP· patent location history
2017–2018Patents assigned to WESTERN DIGITAL TECH INC (5)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
FUJITSU LTD162000–2009
HGST Netherlands BV162013–2018
NAGASAKA KEIICHIself62013–2015
SHIIMOTO MASATO52013–2014
WESTERN DIGITAL TECH INC52017–2018
Locations
LocationPatentsSpan
Isehara, JP212013–2018
Kawasaki, JP162000–2009
Kanagawa, JP12016