PdPtMn/CoFeB synthetic ferrimagnet spin-valve heads

We deposited spin-valve films with a CoFeB/Ru/CoFeB synthetic ferrimagnet pinned trilayer and a PdPtMn anti-ferromagnet layer and investigated their MR responses. We also fabricated spin-valve heads having a Ta(50 Å)/NiFe(20 Å)/CoFeB(15 Å)/Cu(30 Å)/CoFeB(25 Å)/Ru(8 Å)/ CoFeB(15 Å)/PdPtMn(150 Å)/Ta(60 Å) synthetic ferrimagnet spin-valve film. We tested the read/write performance on a low noise CoCrPt-based quaternary alloy thin-film disk. A narrow, effective read track-width of less than 0.4 μm was measured. We obtained a normalized output with respect to track-width of 2500 μVpp/μm. Using a EPR4ML channel with a 16/17 code and an inductive head with a track-width of 0.45 μm, we found a bit error rate to be less than 3.45×10^-6 without error correction at a data rate of 13.3 MB/s and at a linear density of 405 kBPI on the similar disk. Furthermore, from squeeze measurements, we found the track-pitch to be 0.505 μm, which corresponds to a track density of 50.3 kTPI. As a result, we accomplished an areal density of 20.4 Gbit/in² with a linear density of 405 kBPI and a track density of 50.3 kTPI using PdPtMn/CoFeB synthetic ferrimagnet spin-valve heads