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Journal of the Magnetics Society of Japan
Vol. 39 (2015) No. 2 p. 33-36



Magnetic Recording

  Magnetic holography is a rewritable holographic technology with magnetic media. We reported that magnetophotonic crystal (MPC) media are effective to bring high diffraction efficiency because of an enhancement of Faraday rotation angle and deep magnetic fringes. In this paper, we investigated the MPC media with more than 2-pair Bragg mirrors, which may show much higher efficiency due to their enhanced Faraday rotation angle. However, the intensity of diffracted beam of such the MPCs decreased because of the low transmittance due to the absorption of magnetic material. The relationship between the optical properties of magnetic material in MPCs and the diffraction efficiencies were investigated. High optical efficiencies will be achieved by using the magnetic material with high magneto-optical figure of merit such as bismuth substituted gadolinium iron garnet.

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