大隧
大隧-
采用高自旋极化率（P）的材料是产生大的隧穿磁电阻（TMR）效应的关键之一，而半金属（half-metal）铁磁材料的自旋极化率P理论上可达100%。
However , the large tunneling MR effect is strongly dependent upon electrode material , which is of high spin polarization . On the other hand , half-metallic material is theoretically predicted to be perfect spin polarization , nearly 100 % .