Browse Prior Art Database

Homogeneous Rotating Field for Bubble Chip with Optical Access

IP.com Disclosure Number: IPCOM000088528D
Original Publication Date: 1977-Jun-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Bekkers, GW: AUTHOR [+2]

Abstract

A compact rotating-field generator suitable for use in experimental and test setups for bubble devices is shown in Figs. 1 and 1A. This generator requires comparatively low drive voltages to provide a high-frequency rotating field uniformly over the chip.

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Homogeneous Rotating Field for Bubble Chip with Optical Access

A compact rotating-field generator suitable for use in experimental and test setups for bubble devices is shown in Figs. 1 and 1A. This generator requires comparatively low drive voltages to provide a high-frequency rotating field uniformly over the chip.

The generator has a coil assembly 10 containing coils 12 and 14 which carry sinusoidal currents 90 Degrees out of phase to apply a rotating uniform field to the ferrite disk 16. The bubble chip 18 is positioned on a copper disk 20. The diameter of the ferrite disk 16 must be at least twice the side length of the bubble chip 18. The distance between the surfaces of the disk 16 and the chip 18 should not be greater than 0.05 x chip diameter. The reflection plate 22 and the top shield 24 increase the efficiency of the device, while the copper disk 20 makes the Z component of the field negligibly small over the chip area. Optical or physical access to the chip 18 is made through the hole 26 in the top shield 24.

While the specific embodiment describes use with a bubble chip, this type of device may also be used to generate a uniform rotating field in an accessible region for any other application.

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