Stability of information in Bloch line memories

Author

Zimmermann, L. ; Miltat, J. ; Pougnet, P.

Author_Institution

SAGEM Centre d´´Etudes d´´Eragny, Cergy Pontoise, France

Volume

27

Issue

6

fYear

1991

fDate

11/1/1991 12:00:00 AM

Firstpage

5508

Lastpage

5510

Abstract

The wall state stability of magnetic bubbles in ferrimagnetic as-grown garnet films suitable for Bloch line memory applications is investigated in order to predict the stability of vertical Bloch line pairs. In the experiment (1, 0) and (0, 2) bubbles are subjected to fast bias pulses (15-ns width) and to an in-plane field. It is found that the winding line pair present in a (0, 2) bubble can be annihilated, resulting in a (1, 0) final state. On the other hand, a (1, 0) bubble can be switched into a (0, 2) bubble with different experimental conditions. These nonconservative switching processes are in most cases irreversible. However, the switching probability never reaches 100%. An interpretation of the annihilation mechanism is given, and the consequences for devices are discussed

Keywords

garnets; magnetic bubble memories; magnetic domain walls; Bloch line memories; annihilation mechanism; fast bias pulses; ferrimagnetic as-grown garnet films; in-plane field; magnetic bubbles; nonconservative switching processes; switching probability; vertical Bloch line pairs; wall state stability; winding line pair; Conducting materials; Conductors; Ferrimagnetic films; Garnet films; Hip; Magnetic materials; Pulse amplifiers; Pulse generation; Space vector pulse width modulation; Stability;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.278885

Filename

278885