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Surface Topography for Field Induced Domain Propagation

IP.com Disclosure Number: IPCOM000083034D
Original Publication Date: 1975-Mar-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Mehta, RR: AUTHOR [+2]

Abstract

Preferred bubble material structures having a serrate surface topography containing a plurality of dams are shown in Fig. 1 or grooves, as shown in Fig. 2.

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Surface Topography for Field Induced Domain Propagation

Preferred bubble material structures having a serrate surface topography containing a plurality of dams are shown in Fig. 1 or grooves, as shown in Fig. 2.

A serration on the surface represents a directional coercive force which is proportional to the slope of the surface. Bias field modulation is used to modulate domain size, which in combination with directional coercivity causes unidirectional bubble translation. Unidirectional bubble translation occurs when there is a modulation of domain size perpendicular to the serration.

The described bubble translation mechanism is, however, inefficient as bubble size modulation occurs predominantly parallel to the serration.

The solution to this problem consists of having either grooves or dams run perpendicular to the serration. The presence of dams or grooves restricts size modulation parallel to the serration, and thus makes bubble translation more efficient.

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