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Influence of the domain structure of nano-oxide layers on the transport properties of specular spin valves

This paper outlines the successful use of NiFe/(Co90Fe10)ioo-~Bx (x = 5 1 0 % ) for soft magnetic, thermally stabilized spin-valves. The GMR effect in the NiFeKoFeB spinvalve increases after annealing. The annealing effect of CoFeB on CoFeB/Cu interfaces is investigated by high resolution TEM-EDX analysis. Merged inductive NiFe/CoFeB spin-valve heads with a read gap length of 0.18 pm and a write gap length of 0.28 pm having Ni0(400W)/NiFe(10~)/CoFeBs(lO~)/Cu(32~)/ CoFeBs(20A)/Ta(lOOW) spin-valve film and high Bs laminated FeZrNiNiFe top poles were fabricated. Their read/write performance were tested on a low noise CoCrigPtgTa2Nb~ thinfilm disk with an Mrt of 0.6 memukm2 and a coercivity of 2600 Oe. A normalized output per track-width of 1000 pVpp/pm and a 50% rolloff linear density (Dso) of 182 kFCI is obtained. This performance well exceeds the performance of 5 Gbit/in2 spinvalve heads. The measured SIN was 26.8 dB for a spin-valve head with with a narrow read track-width of 0.68 pm, and the feasibility of 8 G bit& recording density is studied using a 1/7 code Narrow Band PRML channel.