Synthetic hybrid Co_2FeGe/Ge(Mn) superlattice for spintronics applications

摘要

Herein, we propose and provide evidence for the experimentally and theoretically promising route of exploring spintronics materials with high performance via a synthetic hybrid of half-metallic fer-romagnet and diluted magnetic semiconductor. Crystalline and well-ordered [Co_2FeGe/Ge(Mn)]_n superlattice, which is free of secondary phase separation, were prepared by the hybridization of end members, Co_2FeGe and Ge(Mn), using the molecular beam epitaxy technique. Besides comparable magnetic properties with respect to the Co_2FeGe films, the superlattice sample exhibits superior properties in electric conductivity and spin polarization, thus enhancing in favor of the spin injection efficiency. These results demonstrate the high feasibility of spintronics materials with low saturation magnetization, small coercivity, high Curie temperature, and high spin injection efficiency through the proposed route in this work.