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Magnetoresistance in 82Ni-Fe/Al-Al2O3/Co Junction-Dependence of the Tunneling Conductance on the Angle between the Magnetizations of Two Ferromagnetic Layers

The magnetoresistance of a ferromagnetic tunneling junction in 82Ni-Fe/ Al-Al<inf>2</inf>O<inf>3</inf>/Co, prepared by electron beam evaporation in a 1×10<sup>-6</sup> Torr vacuum, was studied. Tunneling was confirmed to occur by measuring the I-V characteristic and its temperature dependence, which were in good agreement with Stratton's tunneling theory. The hysteresis curve of the magnetoresistance corresponds well to that of the magnetization. The magnetoresistance ratio δR/R was 2.7% and 3.5% at room temperature and 77K respectively. The dependence of the tunneling conductance (G) on the angle (θ) between the magnetizations of the two ferromagnetic layers was also measured. The G values can be expressed as G=G<inf>0</inf>(l+ϵcosθ) (where G<inf>0</inf> and ϵ are constants), which agrees well with the theory proposed by Slonczewski.