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Browse Prior Art Database

Increase of Faraday Rotation in Magneto Optic Films

IP.com Disclosure Number: IPCOM000076026D
Original Publication Date: 1971-Dec-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Ahn, KY: AUTHOR [+2]

Abstract

Magneto-optic readout by Faraday rotation in a given material is increased by depositing thin films of the material on single-crystal substrates. When the direction of the easy axis is parallel to the preferred orientation of the film, a large increase in Faraday rotation is observed with the driving magnetic field along the same preferred direction.

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Increase of Faraday Rotation in Magneto Optic Films

Magneto-optic readout by Faraday rotation in a given material is increased by depositing thin films of the material on single-crystal substrates. When the direction of the easy axis is parallel to the preferred orientation of the film, a large increase in Faraday rotation is observed with the driving magnetic field along the same preferred direction.

Both EuO and EuS have an easy axis of magnetization along the (111) direction and a hard axis along the (100) direction. Films of EuS can be deposited on mica and Al2O3 having highly preferred orientation along the (111) direction. These films are deposited at a pressure of 5X10/-8/ Torr. using an electron-beam gun. The substrates are heated to 450 degrees C and exposed to the vapor beam at the same time. A typical evaporation rate is 5 angstroms/second. The starting material for the evaporation is high density EuS (95-100%) which was heated to 2000 degrees C for 4 hours.

Magneto-optic properties were measured when the films were cooled to about 5 degrees K. The Faraday rotation of a highly oriented film on a mica substrate is about three times that of a randomly oriented polycrystalline film on a quartz substrate. With sapphire substrates, the degree of orientation of the films is less than that of mica, although the Faraday rotation is still more than twice that obtained with the quartz substrates.

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