Hs. Jung et Wd. Doyle, FeTaN/IrMn exchange-coupled multilayer films as soft underlayers for perpendicular media, IEEE MAGNET, 37(4), 2001, pp. 2294-2297
Soft underlayers of FeTaN/IrMn exchange-coupled films for perpendicular med
ia have been investigated. FeTaN(t(FeTaN))/IrMn(10 mn) multilayer films hav
ing different FeTaN thicknesses t(FeTaN) from 20 nm to 200 mn were prepared
while keeping the total FeTaN thickness at 200 nm. When t(FeTaN) decreased
below 100 mn to 20 run, the exchange bias field increased from 3.6 Oe to 7
7 Oe, and the pinning field from 25 Oe to 105 Oe. The interfacial exchange
energy, J, was 0.10 similar to0.13 ergs/cm(2). As the exchange bias field i
ncreased, the angular reversibility increased from 10 degrees to 57 degrees
in good agreement with the coherent rotational model. Radially oriented mu
ltilayer films of FeTaN (20 nm)/[IrMn(10 mn)/FeTaN(20 nm)](9) were successf
ully prepared on 65 mm disks and showed excellent angular reversibility, a
pinning field > 70 Oe, and a permeability of 70 up to 2 GHz.