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Spin tunneling recording heads above 20 Gb/in2 have been fabricated using a bottom tunneling junction stack. The spin tunneling stack is made of Ta/PtMn/CoFe/Ru/CoFe/AlO/NiFe/Ta and stabilized by a permanent magnet abutted junction. The effective junction width is about 0.4 μm wide and lapped to the junction with an optimum stripe height. The barrier has resistance area product of 15-20 Ωμm2, leading to a typical head resistance of around 50 Ω. Isolated pulses during the spin-stand test shows large signal up to 10 mV. On track error rate floor is better than 10-9 and the head signal-to-noise ratio is also better than that of. a conventional spin valve GMR head. The areal density estimated (using BER of 10-5) is above 20 Gb/in2.
Date of Publication: Jan. 2002