Site: Hitachi Central Research Laboratory
Planning Office
Higashi-Koigakubo
Kokubunji-shi
Tokyo 185-8601, Japan
Fax: 81-423-27-7695

Date Visited: 22 July 1997

WTEC: E. Hu (report author), L. Jelinski, C. Koch, D. Shaw, C. Uyehara

Hosts:

INTRODUCTION

The Research Cooperation Center Planning Office of Hitachi Central Research Laboratory hosted the WTEC team's visit. We were greeted by Dr. Shigeo Nagashima, Deputy General Manager and Head of the Planning Office. Exact figures were not available as to the representation of nanotechnology research at Hitachi.

RESEARCH AND DEVELOPMENT HIGHLIGHTS

Dr. M. Miyao discussed enhancement of light emission from SiGe quantum well devices:

Dr. T. Katsuyama gave a presentation on exciton-polariton quantum wave devices, with confinement within quantum wires. He discussed a novel means of forming the quantum wires, or quantum whiskers:

Dr. A. Kikukawa discussed some means of ultrahigh density recording using atomic force microscopy (AFM) indentation (Figure D.1).


Figure D.1. Concept for high density data recording using nano-indentation (Hitachi).

Dr. M. Futamoto gave an excellent presentation on "near-term" issues for improved materials for magnetic storage (with charts, etc.).


Figure D.2. Need for storage capacity, in bytes (Hitachi).


Figure D.3. Perpendicular recording using CoCrTa (Hitachi).

Dr. K. Yano discussed single-electron memory schemes (Figure D.5). He had previously worked at ASU with Ferry.

 


Figure D.4. Spin valve structure.


Figure D.5. Single electron memory concept.


Figure D.6. Polysilicon transistors.


Figure D.7. Ladder-shaped memory cell array.

The WTEC team's hosts were pessimistic about single-electron logic, stating that reliability requirements are severe. They stated that memory is different ¾ it is possible to use conventional CMOS circuitry to insert different cell structures.


Published: September 1999; WTEC Hyper-Librarian