Perpendicular magnetic recording media based on Co-Pd multilayer with granular seed layer

Cu/Zr nanoscaled multi-stacks fabricated by accumulative roll bonding

“…For example, nanoscaled multilayers usually exhibit high yield strength, which is close to 1/2 or 1/3 of their theoretical value at room temperature. Those containing magnetic layers are also attractive when used as magnetic recording media or microelectromechanical system [2][3][4]. What is more, nanoscaled multilayers consisting of two metallic layers with negative mixing enthalpy have been widely used to study the mechanism of thermally induced solid state amorphization [5][6][7].…”

Soft x-ray magnetic circular dichroism study of [Co/Pd] multilayered perpendicular magnetic films

“…3,4 A sputter-deposited multilayered film consisting of Co and Pd thin layers 5 ͑hereafter abbreviated as ͓Co/Pd͔ n , where n is the lamination number of the Co and Pd layers͒ has attracted much attention as a perpendicular magnetic recording medium for high-density magnetic recording. [6][7][8][9][10][11][12][13][14] The ͓Co/Pd͔ n film possesses a high perpendicular magnetic anisotropy constant (K u ) and a squareness ratio ͑SQR͒ of unity 5 even when it is sputter-deposited at room temperature. The strong perpendicular magnetic anisotropy of the ͓Co/Pd͔ n film derives from the surface magnetic anisotropy caused by the hybridization of the Co 3d and the Pd 4d orbitals.…”

Co/Pd multilayers for perpendicular magnetic recording media

“…Alternatively, work has been done to decrease the thickness of the seedlayer to minimize the distance between the recording head and the soft underlayer. Matsunuma et al reported a Pd-SiN seedlayer, 3 nm thick, to have a coercivity of 3.9 kOe and 13.7 nm grain size [6]. Medium presented in this paper was deposited on a 7 nm seedlayer (2 nm InSn/5 nm Pd) at room temperature to achieve extremely high coercivities, estimated to be nearly 20 kOe, with relatively small grains (12.1 nm).…”

“…Achieving acceptable values for grain size and coercivity while keeping seedlayer thickness small has been a challenge for PMR media [4][5][6]. The seedlayer should be as thin as possible in order to reduce ''spacing loss'' between the recording head and the soft underlayer.…”