Enter inventor name

Yohji Maruyama

USPTO Granted Patents = 50 (Patent Applications = 1)

Average Co-Inventor Count = 4.3

ph-index = 11

Forward Citations = 380(Granted Patents)

Forward Citations (Not Self Cited) = 377(Dec 10, 2025)

Inventors with similar research interests:

Location History:

Saitama-ken, JP (2013)
Saitama, JP (2010 - 2016)
Iruma, JP (1999 - 2017)

Company Filing History:

Hgst Netherlands, B.v.

patents

10 out of 2,636

Hitachi Global Storage Technologies Netherlands B.v.

patents

4. 4 out of 227

Hitachi Global Storage Technologies Japan, Ltd.

patents

5. 1 out of 5,313

Western Digital Technologies, Inc.

patents

6. 1 out of 1

Hitachi Global Technologies Japan, Ltd.

patent

Years Active: 1999-2017

Loading Chart...

Areas of Expertise:

Microwave-Assisted Magnetic Recording

Magnetic Recording Head

Perpendicular Magnetic Recording

Thin Film Magnetic Head

Magnetic Shielding

Magnetic Disk Drive

High-Density Recording

Magnetic Sensor Technology

Electromagnetic Field Generation

Data Storage Solutions

Magnetic Head Design

Recording Equalizer

50 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 9672846 - STO bias control for MAMR head reliability (2017-06-06),

2. 9330687 - Microwave-assisted recording head with stable oscillation (2016-05-03),

3. 9230573 - Magnetic recording head with non-magnetic bump structure formed on spin torque oscillator (2016-01-05),

4. 9230566 - Perpendicular magnetic write head having a controlled magnetization state shield (2016-01-05),

5. 9142227 - Microwave assisted magnetic recording (MAMR) write head and system (2015-09-22),

6. 9099127 - Dual magnetic sensor for multi-input magnetic recording (2015-08-04),

7. 9076462 - Magnetic head having a short yoke with a tapered coil structure (2015-07-07),

8. 8786986 - Head-slider including thin-film magnetic-recording head having reduced thermal protrusion (2014-07-22),

9. 8570683 - Low permeability material for a side shield in a perpendicular magnetic head (2013-10-29),

10. 8542462 - Perpendicular magnetic recording head having a non-magnetic film recessed from the air bearing surface for improved high-density magnetic recording (2013-09-24),

11. 8537493 - Magnetic head for perpendicular recording (2013-09-17),

12. 8477455 - Noise and particle shield for contact sensor in a slider (2013-07-02),

13. 8373940 - Magnetic head having a facing electrode pair for generating an electromagnetic field and applying energy to the magnetic recording layer (2013-02-12),

14. 8351156 - Perpendicular magnetic recording head having a main pole and first and second magnetic films peripheral to the main pole and having different depths from an air bearing surface (2013-01-08),

15. 8300358 - Magnetic head having write pole, first soft magnetic films separately disposed on both sides of the main pole, and a second soft magnetic film disposed on a trailing side of the main pole (2012-10-30),

Title: Innovations by Yohji Maruyama in Magnetic Recording Technology

Introduction

Yohji Maruyama, based in Iruma, Japan, is a prolific inventor known for his significant contributions to the field of magnetic recording technology. With an impressive portfolio of 50 patents, Maruyama's innovative solutions have advanced the reliability and efficiency of data storage devices.

Latest Patents

Among his latest patents, Maruyama developed a "STO bias control for MAMR head reliability." This invention focuses on a magnetic recording head that includes a spin torque oscillator (STO) positioned over the main pole, which generates a high-frequency magnetic field on a magnetic medium. The controller in this system adjusts the bias currents to optimize the recording process.

Another notable innovation is his patent for a "Microwave-assisted recording head with stable oscillation." This invention describes a magnetic recording head designed for microwave-assisted magnetic recording. It features a spin torque oscillator that produces a high-frequency magnetic field at stable frequency and amplitude, contributing to more reliable data recording on disks.

Career Highlights

Yohji Maruyama has held influential positions at prominent companies throughout his career. Notably, he worked at Hitachi, Ltd. and HGST Netherlands B.V., where he collaborated on groundbreaking technologies in magnetic recording.

Collaborations

Maruyama has worked closely with esteemed colleagues such as Hisashi Takano and Kazue Kudo. Their collaboration has fostered innovative advancements in the industry, underscoring the importance of teamwork in technological development.

Conclusion

Yohji Maruyama's contributions to magnetic recording technology through his numerous patents exemplify his role as a leading inventor in the field. His innovations are pivotal in enhancing the performance and reliability of data storage devices, ensuring that the industry continues to evolve and meet the demands of modern technology.

This text is generated by artificial intelligence and may not be accurate.

Please report any incorrect information to support@idiyas.com