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Magnetooptical Properties of MnBi Films Prepared by lonized-Cluster Beam Deposition Technique

Ionized-Cluster Beam (ICB) deposition technique developed by the authors was successfully used to prepare a ferromagnetic MnBi for magnetooptical memory applications. The film deposited simultaneously Mn and Bi onto a glass substrate by the technique, followed by annealing at 300°C for 3 hr was entirely uniform over the large substrate area, and showed a high stability in the thermal writing over a number of cycles. The nucleation and crystal growing processes of the films formed by the method were studied, and it was found that the crystal growth of MnBi starts at the annealing temperature as low as 100°C, which is nearly 1/3 of the corresponding temperature in the conventional vacuum evaporation. These results are interpreted as due to the charged particles and their kinetic energies.