Browse Prior Art Database

Automotion of Unichiral Magnetic Bubble Domains

IP.com Disclosure Number: IPCOM000087222D
Original Publication Date: 1976-Dec-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 24K

Publishing Venue

IBM

Related People

Dekker, P: AUTHOR [+2]

Abstract

By the principle of "automotion", magnetic bubble domains are moved by spatially uniform, time varying magnetic fields, without the need for magnetic overlay structures. In the present technique, unichiral magnetic bubbles having no vertical Bloch lines, as shown in Fig. 1, are moved by application of an asymmetric, time varying z-field pulse h(z) and a constant in-plane magnetic field h(y).

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Automotion of Unichiral Magnetic Bubble Domains

By the principle of "automotion", magnetic bubble domains are moved by spatially uniform, time varying magnetic fields, without the need for magnetic overlay structures. In the present technique, unichiral magnetic bubbles having no vertical Bloch lines, as shown in Fig. 1, are moved by application of an asymmetric, time varying z-field pulse h(z) and a constant in-plane magnetic field h(y).

The motion of the unichiral bubble domains, shown in Fig. 1, is due to the difference in dynamic behavior between the "loaded" heavy part of the bubble domain wall, where the magnetization of the wall is anti-parallel to h(y), and the normal part of the wall, where the magnetization of the wall is parallel to h(y). When a fast step occurs in the z bias field, as indicated by the z-field pulse in Fig. 2A, the heavy part of the domain wall cannot immediately respond. Since the normal part of the wall does immediately respond, the net velocity of the bubble domain center is approximately V/2, where V is the velocity of the normal wall. V is normal to the direction of h(y).

When the step in the z-field bias is caused by a slow variation with respect to time, both wall parts respond by equal and opposite displacements and hence the bubble center does not move. Reversal of the polarity of the z-field pulses changes the signature of V. V is given by the following expression: V = c(h(z)xh(y))/h(z)h(y).

In a particular example, unichiral...