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Browse Prior Art Database

Automotion of Unichiral Bubbles

IP.com Disclosure Number: IPCOM000089198D
Original Publication Date: 1977-Sep-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 22K

Publishing Venue

IBM

Related People

Slonczewski, JC: AUTHOR

Abstract

Bubble automotion is a term applied to the movement of magnetic bubble domains by application of time-varying magnetic field pulses having no spatial gradients to particular types of bubbles. In one type of automotion, time-varying z-fields h(z)(t) are applied to magnetic bubble domains to rapidly modulate their size and to move them by reaction forces on the wall magnetization vectors in the bubble. In another type of automotion, time-varying in-plane magnetic fields h(x)(t) have been used to directly act on vertical Bloch lines in the bubble domain wall structure.

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Automotion of Unichiral Bubbles

Bubble automotion is a term applied to the movement of magnetic bubble domains by application of time-varying magnetic field pulses having no spatial gradients to particular types of bubbles. In one type of automotion, time-varying z-fields h(z)(t) are applied to magnetic bubble domains to rapidly modulate their size and to move them by reaction forces on the wall magnetization vectors in the bubble. In another type of automotion, time-varying in-plane magnetic fields h(x)(t) have been used to directly act on vertical Bloch lines in the bubble domain wall structure.

The present technique describes automotion of unichiral bubble domains of the type shown above. These domains have no vertical Bloch lines in their wall magnetization, and the wall moments point in the same direction around the entire wall. These unichiral bubbles can be automoted in the direction x by combining alternating time varying magnetic fields h(y)(t) and h(z)(t) at the same frequency. Adjustment of the phase angle between h(y)(t) and h(z)(t) optimizes the automotion velocity. The automotion direction reverses with change in chirality. The automotion velocity V is nearly orthogonal to h(y)(t), and depends on the phase relationship between h(y)(t) and h(z)(t), as well as on their amplitudes.

The availability of four external parameters (h(z), h(z), frequency, and phase) permits a systematic way for independently adjusting the amplitudes of the radial and transla...