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In this work, we have studied the magneto-optical (MO) and the dynamic behavour of exchanged-coupled (EC) layers between the Nd16Tb14Fe52Co18 (at. %) films for the read-out (RO) layers and the Tb22Fe70Co8 (at. %) films for the storage (ST) layers. In the five layered SiNx/NdTbFeCo/TbFeCo/SiNx/Al-Ti films, the Kerr rotation angles (θk) increased compared to those of the four layered films with either a mono-RO or a mono-ST layer at R (thickness ratio of ST to RO)≤3. The coercivity (Hc) significantly increased from 1.19 KOe-2.77 KOe to 2 KOe-5.6 KOe in an entire range of R. This was ascribed to an occurrence of the exchange-coupling between RO and ST layer. Squareness ratio monotonously increased from 0.75 to 1.0 as R increased from 1.5 to 6. The maximum carrier-to-noise ratio (CNR) of the five layered magneto-optical disk enhanced from 36.5 dB to 47.6 dB as R increased from 1.5 to 6. This was attributed to the improved Hc and the enhanced squareness due to the exchange-coupling. The composite of the experimental results suggests that thinner RO layer is favorable to obtain the high MO properties and the improved dynamic characteristics.

MAGNETIC, MAGNETO-OPTICAL AND DYNAMIC CHARACTERISTICS OF EXCHANGED-COUPLED NdTbFeCo/TbFeCo FILMS For 532 NM RECORDING MEDIA