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Antireflection Coatings for the Enhancement of Magneto Optic Effects in Amorphous Rare Earth Transition Metal Alloys

IP.com Disclosure Number: IPCOM000079977D
Original Publication Date: 1973-Oct-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Cuomo, JJ: AUTHOR [+3]

Abstract

Kerr magneto-optic effects in amorphous rare earth transition metal alloys are enhanced by using antireflection coatings.

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Antireflection Coatings for the Enhancement of Magneto Optic Effects in Amorphous Rare Earth Transition Metal Alloys

Kerr magneto-optic effects in amorphous rare earth transition metal alloys are enhanced by using antireflection coatings.

In practice, specific combinations of coatings on magnetic films must be fabricated and tested to determine if the coating is: (a) effective as an antireflection coating; (b) enhances the magneto-optic effect; and (c) does not degrade the magnetic properties of the magnetic film.

Films of SiO satisfy the above criteria as a Kerr enhancement layer on sputtered thin films of amorphous Gd-Co alloys. Other materials with a high- refractive index, which will serve to act as antireflection coating materials on metal surfaces are Al(2)O(3), Si(3)N(4), ZnO, AlN, ZnS, TiO(2), and the like. Si and Ge in thin film form will also serve as an antireflection coating, and an enhanced Kerr contrast will be obtained when such materials are deposited on rare earth intermetallic alloys.

The organic coating, parylene, is also a good candidate, since its index is about 1.7 and has good pinhole-free characteristics.

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