Cross-track noise profile measurement for adjacent-track interference study and write-current optimization in perpendicular recording

摘要: A cross-track noise profile measurement is developed for identifying the source of adjacent-track interference (ATI) fields in perpendicular recording systems. The amplitude as a function position and write current clearly delineates extent, magnitude, polarity stray under different portions head. Experimentally obtained field strength relative to writing good agreement with finite element modeling. For given head disk components, composite picture both also provides way selecting an optimal respect medium dynamic coercivity, saturation, ATI threshold. Further investigation on asymmetries profiles have led two interesting discoveries. first asymmetry that can be attributed radially oriented magnetization soft underlayer. second artifact associated change read sensitivity around track edges due from dc-erased hard layer.