Optical magnetic-field measuring apparatus having improved tempe

Details Optical magnetic-field measuring apparatus having improved tempe Optical magnetic-field measuring apparatus having improved tempe

1983-10-26

1986-04-08

Karlsen, Ernest F.

Electricity: measuring and testing

Magnetic

Magnetometers

350375, G01R 3302, G02B 530, G02F 129, G02F 131

Patent

active

045815798

ABSTRACT:
In a magnetic-field measuring apparatus having a Faraday rotation property, a medium having the Faraday rotation property includes at least one magnetic garnet thin film having a composition represented by a general formula of R.sub.3 (Fe.sub.5-x M.sub.x)O.sub.12 (where R is at least one element selected from a group consisting of La, Sm, Lu, Ca and Bi, or at least two elements selected from the group with Y being added thereto, M is at least one element selected from a group consisting of Ga, Ge, Al, Si, Sc, In and Cr, and a range of x is 0.ltoreq.x.ltoreq.1.5), and magnetized in a direction of light transmission, whereby an overall temperature characteristic of a ratio (4.pi.Ms/Ho) of a saturation flux density 4.pi.Ms to a collapse field Ho of a strip domain of the thin film is improved. The magnetic-field measuring apparatus offers a stable measurement of magnetic-field irrespective of a temperature change.

REFERENCES:
Fowlis et al, "Rapid Method for Determining the Magnetization and Intrinsic Length of Magnetic Bubble Domain Materials", Magnetism and Magnetic Materials 1971, American Institute of Physics, pp. 240-243.

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