【摘要】 用高真空多靶离子束溅射沉积技术制备Fe/Al2 O3 /Fe隧道结样品 ,观测和分析了“三明治”结构的双Hc磁滞特性 .通过样品的V I特性研究了隧道结两层电极之间电子输运的自旋偏振隧穿效应以及结电阻与零场结偏压的关系更多还原

【Abstract】 Using ion-beam-sputtering technique with plasma oxidization to create an isolating layer of Al-2O-3, we have fabricated some Fe/Al-2O-3/Fe magnetic tunnel junctions(MTJ) samples. The base pressure of the vacuum chamber equipped with a Kauffman gun was 8.0×10 -5 Pa, and the argon (99.99%) pressure was 2.0×10 -2 Pa when sputtering. The hysteretic curve and V-I character of the junction samples were studied, the double Hc hysteretic loop and a nonlinear V-I curve were observed, which demonstrated that the conductance of the tunneling junctions originates from the spin polarized tunneling effect. Under zero magnetic field the junction resistance changes with the increase of applied junction voltage bias were studird.更多还原