Multiple choice

What type of magnetic material is normally used in bubble memories?

  1. Magnetic core

  2. Cobalt

  3. Garnet

  4. Metallic
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Bubble memory technology uses thin films of garnet (typically garnet ferrite) as the magnetic material. These garnet films have magnetic domains that can form stable 'bubbles' representing data bits. Magnetic cores are used in core memory, cobalt has some applications but garnet is the standard for bubble memories, and metallic materials are not suitable for bubble formation.

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