Variation of Stripe-Domain Spacing in a Faraday Effect Light Deflector

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Abstract
Stripe‐domain ferromagnetic films with high Faraday rotation and low optical absorption will rotate the angle of polarization of light transmitted through even‐numbered domains an angle φ = FT and through odd‐numbered domains an amount −φ, where F is the Faraday constant and T is the film thickness. The result of the differential rotation is that the film will act like a transmission diffraction grating. Since the orientation and spacing of the stripes may be altered by appropriate applied fields, the film may be used as a laser light deflector. A two dimensional model is proposed for stripe domains in some ferromagnetic films. This model differs from previous models (see Ref. 4–8) in that it includes the dependence of wall width on wall angle and thereby shows that variations in stripe‐domain spacing of more than an order‐of‐magnitude are possible. Variations of this amount were observed experimentally in a YIG platelet which was used as a stripe‐domain light deflector.

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