フェライト メモリ コアの高速磁束反転におよぼす外部磁場の影響

抄録

The influence of an external magnetic field on the magnetization reversal of ferrite core was investigated. Switching speed of ferrite core is found to increase by applying an external magnetic field.
In a low drive magnetic field region, a transverse output which corresponds to an uniform rotation mode is observed by applying an external magnetic field. This fact shows the existence of a mixture of magnetization reversal modes under external magnetic field, viz. an uniform rotation superposed on domain wall motion or on nonuniform rotation as the case may be. The ratio of magnetization by the uniform rotation mode to total magnetization reversal is about 2 or 3% at drive magnetic field=30.0 Oe and external magnetic field=45.0 Oe.
GILBERT equation as the equation of motion of magnetization reversal was adopted and output waveforms by magnetization reversal are calculated under appropriate condition and are compared with experimental results.