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Organization / Research

Muraoka Laboratory


photo Hiroaki MURAOKA, Professor
Simon J. GREAVES, Associate Professor

Our main interest lies in high-density information storage technology. The core technology is magnetic recording with fast data transfer and large storage capacity, which is applied for hard disk drives, magnetic tape storage, and flexible disk drives. Recently, multi-media information such as digital movie and music that requires very large storage capacity begins to be used in broad applications from consumer electronics to mobile communication. This trend accelerates the areal density increase of magnetic recording.

Recording theories, devices, and systems based on perpendicular recording are being studied in order to attain ultra-high density information storage. Our target is the terabit storage (1 Tbits/inch2 areal density and beyond), in which the bit size corresponds to the area of 25 nm by 25 nm. Single-pole heads and perpendicular disks are investigated through read/write experiments, as shown in Fig 1, to improve the recording performance. A computer simulation utilizing micromagnetics is being carried out to obtain a guideline towards ultra-high density recording. For extremely large capacity storage systems, the RAID storage working on a network, as shown in Fig 2, is also explored.

Research topics:

  1. High areal density hard disk drives
  2. Micromagnetics simulation for high density read/write theory
  3. Head/disk devices for high density magnetic storage
  4. Digital signal processing for high density storage
  5. RAID storage for large capacity file server
Group of Electrical Engineering, Communication Engineering,
Electronic Engineering, and Information Engineering, Tohoku University
6-6-05, Aramaki Aza Aoba, Aoba-ku, Sendai, Miyagi 980-8579, Japan
TEL : 022-795-7186 (Japanese Only)
Email :