Effects of Nuclear Radiation on Magnetic Bubble Domain Materials and Devices.
Abstract
The work covered in this report deals mainly with experiments to study transient radiation induced information loss in magnetic bubble domain devices. Two shift registers of 96 and 84 bits each were tested. These devices consisted of T-bar propagation loops with a chevron stretcher and thick permalloy (4000 A) magnetoresistive detector on a glass overlay. This overlay was mounted on proton implanted (YGdTm)3(GaFe)5o(12) material. Stored information was read out electrically before and after exposure to electrons. Experiments were performed with the stored domain pattern both stationary and propagating during exposure. Radiation-induced changes usually involved only 1 or 2 bits (bubbles) and the probability of a failure (change of one or more bits) per shot averaged less than 40%. The output of the domain detector was monitored during e-beam exposure and indicates a threshold of >3 x 10 to the 11th power rads(Si)/sec in a 30 ns pulse for generation of false read signals.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1974
- Accession Number
- ADA015857
Entities
People
- R. A. Williams