This work was supported in part by the Japanese NEDO in the Normally-Off Computing Project. The authors would like to thank Prof. Y. Suzuki of Univ. of Osaka for giving detailed information on his intensive works on voltage-inducedmagnetizationswitching.TheywouldliketothankProf.H.Nakamura and his research group of Univ. of Tokyo for valuable discussion on processor architectures.