Hitachi, Ltd.

Mitsuru Sekino

Minoru Hiroshima

Shinzo Matsumoto

Yoshinori Taniguchi

A high-density magnetic bubble memory device using magnetic bubbles having a diameter not larger than 2 .mu.m comprises a magnetic layer capable of sustaining the bubbles therein, and a propagation pattern formed in or on a surface of the magnetic layer. In the device, a relation H/d.ltoreq.0.8 is satisfied wherein H is the thickness of the magnetic layer and d the diameter of the bubble. When the propagation pattern is made of a permalloy, h/d (h: bubble height in that case) is not larger than 0.8. When the propagation pattern is formed through ion implantation, h'/d (h': bubble height in that case) is not larger than 0.6.

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Mobara, Japan

Mitsuru Sekino