关键词：自旋电子学；纳米技术；自旋电子学；自旋金属氧化物
摘 要：Spintronics is the advanced branch of nanoelectronics making use of specially engineered materials that can impart spin functionality in the electrons, in addition to its well-known property of charge. Spin field effect transistor (spin-FET) is a spin-device consisting of ferromagnetic source and drain electrodes to impart spin-functionality into the device with the spin field effect transistor action realized with an electric field applied through the gate voltage. The whole concept relies on controlling the spin precession from source to the drain through a spin-conducting channel by applying a voltage on the gate region. An interesting class of materials is the half-metallic ferromagnetic compounds having majority spin density of states at the Fermi level (E_F) showing metallic behaviour, while minority spin density of states at a certain gap below the E_F. CrO_2 is such a half-metallic oxide with theoretical predicted 100% degree of spin-polarization and high Curie temperature (T_C) of ～395 K making it appropriate for spin-device applications. Hence, nanotechnology is the technology of the future, giving rise to the design of new kinds of materials (electronic & magnetic) and devices based on them, all set to revolutionize the world.