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Giant oscillations in spin-dependent tunneling resistances as a function of barrier thickness in fully epitaxial magnetic tunnel junctions with a MgO barrier

机译:具有MgO势垒的完全外延磁性隧道结中自旋相关隧穿电阻的巨幅振荡与势垒厚度的关系

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Giant oscillations in spin-dependent tunneling resistances as a function of MgO barrier thickness (t_(MgO)) were observed for fully epitaxial magnetic tunnel junctions with Heusler alloy Co_2Cr_(0.6)Fe_(0.4)Al electrodes and a MgO barrier. The oscillations in tunneling resistances were well approximated by a superposition of an exponential function of exp(at_(MgO)+b) and a periodic function of 1 + C cos[(2π/T)t_(MgO)+φ] with significantly large amplitudes C~0.16±0.01 even at 293 K for both parallel and antiparallel magnetization orientations. The period was found to be almost independent of temperature and bias voltage (V). The amplitudes C showed only weak dependence on V at least up to 0.2 V. These features should be a key to understand the origin of the pronounced oscillations.
机译:对于具有Heusler合金Co_2Cr_(0.6)Fe_(0.4)Al电极和MgO势垒的完全外延磁性隧道结,观察到自旋相关的隧穿电阻随MgO势垒厚度(t_(MgO))的剧烈振荡。隧道电阻的振荡可以通过exp(at_(MgO)+ b)的指数函数和1 + C cos [(2π/ T)t_(MgO)+φ]的周期函数的叠加来很好地近似,对于平行和反平行磁化方向,即使在293 K时,振幅C〜0.16±0.01。发现该周期几乎与温度和偏置电压(V)无关。振幅C仅显示出对V的微弱依赖性,至少不超过0.2V。这些特征应该是了解明显振荡起因的关键。

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