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Thin Single Crystals of Magneto Plumbite Structure Ferrites

IP.com Disclosure Number: IPCOM000073496D
Original Publication Date: 1970-Dec-01
Included in the Prior Art Database: 2005-Feb-22
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Gambino, RJ: AUTHOR

Abstract

Single crystals of spinel ferrites have been grown epitaxially on MgO seeds by the molten salt solvent evaporation method. Bulk single crystals of hexagonal ferrites with the magneto plumbite and related structures have been grown by slowly cooling Na(2)CO(3) fluxed melts. For bubble domain devices, it would be advantageous to grow thin, c-axis, single crystals of hexagonal ferrites. The growth of thin single crystals eliminates the device fabrication steps of cutting and polishing bulk single crystals which, in addition to being costly operations damage the crystals in a manner which adversely affects the performance of the device.

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Thin Single Crystals of Magneto Plumbite Structure Ferrites

Single crystals of spinel ferrites have been grown epitaxially on MgO seeds by the molten salt solvent evaporation method. Bulk single crystals of hexagonal ferrites with the magneto plumbite and related structures have been grown by slowly cooling Na(2)CO(3) fluxed melts. For bubble domain devices, it would be advantageous to grow thin, c-axis, single crystals of hexagonal ferrites. The growth of thin single crystals eliminates the device fabrication steps of cutting and polishing bulk single crystals which, in addition to being costly operations damage the crystals in a manner which adversely affects the performance of the device.

Thin, c-axis single crystals of ferrites with the magneto plumbite structure can be grown by the molten salt solvent evaporation method. Single crystals of BaFe(12)O(19) are grown on (111) MgO seeds by firing a mixture of BaCo(3) and Fe(2)O(3) in a 1 to 6 molar ratio with an equal weight of Na(2)CO(3) at 1250 degrees C in air for 16 hours. The crystals are about 20 mu m thick and typically cover the entire top surface of the seed crystal (approx. 1 cm/2/).

Thin single crystals of compounds with nominal compositions BaFe(8)Ga(4)O(19), BaFe(6)Ga(6)O(19) and BaGa(12)O(19) are grown by solvent evaporation but in these cases random nucleation on a platinum sheet is used. The crystals varied in longest dimension from a few tenths of a mm up to about 7 mm. The largest crystals were...