Authors are grateful to Dr. Y. A. Ono of RIKEN and Dr. H. Shinada, and Dr. T. Kohashi of Hitachi, Ltd. for valuable discussions, Mr. N. Moriya of Hitachi, Ltd. and Mr. Y. Ichinosawa of Optnics Precision Co., Ltd. for technical support on the grating experiments. Authors thank Prof. S. Mori, Prof. Y. Ishii, and Dr. H. Nakajima of Osaka Prefecture University for evaluation of the ferrite magnet.
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