Direction Control for Bubble Automotion
Original Publication Date: 1978-Feb-01
Included in the Prior Art Database: 2005-Feb-20
In bubble automotion, magnetic fields couple to Bloch lines in the bubble domain wall, causing precession of these Bloch lines. This in turn leads to a reaction force which displaces the bubble center. In one type of automotion, a steady in-plane field H(ip) exists in the plane of the bubble medium, and a pulsed z-field is applied which has no spatial gradients. In order to reverse the direction of automotion under such a drive, H(ip) is changed, since the bubbles automote in a direction orthogonal to H(ip). This is particularly true for sigma bubbles, which are bubbles having two vertical Bloch lines in their domain walls. Automotion of magnetic bubble domains has been described by Argyle et al in the AIP Conference Proceedings (joint MMM-Intermag Conference, Pittsburgh, Pa.) No. 34, p.