Optical magnetic-field measuring apparatus

Details Optical magnetic-field measuring apparatus Optical magnetic-field measuring apparatus

G - Physics

01

R

324/48

G01R 33/032 (2006.01)

Patent

CA 1206524

ABSTRACT OF THE DISCLOSURE 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 R3(Fe5-xMx)O12 (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 < x < 1.5), and magnetized in a direc- tion 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.

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