低インピーダンス強磁性トンネル接合ＮｉＦｅ／Ａｌ２Ｏ３／ＮｉＦｅのノイズ測定

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  • Noise Measurements of Low-impedance NiFe/Al2O3/NiFe Tunnel Junctions.
  • テイインピーダンス キョウジセイ トンネル セツゴウ NiFe Al2O3 NiFe ノ ノイズ ソクテイ

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This paper reports noise measurements of low-impedance NiFe/Al2O3/NiFe tunnel junctions. For samples with a junction area of 4 × 4 μm2, the noise spectrum density Sν shows 1/f-like increase at low frequencies. Sν of the 1/f-like noise depends on bias as V2 and decreases with decreasing temperature as Sν (300 K)/Sν (77 K)∼4. In an external magnetic field of 60 Oe, where coupling of the two ferromagnetic layers changes from parallel to antiparallel, Sν at 77 K is strongly enhanced and its frequency dependence has a shoulder-like anomaly. For a sample with a smaller junction area (2 × 2 μm2), Sν(f) also shows a shoulder-like anomaly even at room temperature in a zero field. In the time domain, two-level fluctuation (telegraph noise) was observed. This observation indicates the existence of fluctuators with spatial scale of the order of 1μm2.

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