Title :
Dynamical response on magnetic soft underlayers
Author :
Nibarger, J.P. ; Lopusnik, R. ; Silva, T.J. ; Jung, H.S.
Author_Institution :
Magnetic Technol. Div., NIST, Boulder, CO, USA
fDate :
March 30 2003-April 3 2003
Abstract :
In this paper, we have made the first direct dynamical measurements of both exchange coupled and non-exchange coupled magnetic soft underlayer (SUL) materials suitable for perpendicular recording. We have found that damping increased by a factor of 2 to 3 for the exchange coupled sample compared to the non-exchange coupled samples. The exchange coupled sample consisted were composed of 50 nm of FeCo with three different 2.5 nm thick seedlayers:Cu, NiFe, and Ru.
Keywords :
cobalt alloys; copper alloys; damping; exchange interactions (electron); ferromagnetic materials; iridium alloys; iron alloys; magnetic multilayers; magnetic thin films; manganese alloys; nickel alloys; perpendicular magnetic recording; ruthenium alloys; soft magnetic materials; 2.5 nm; 50 nm; Cu seedlayers; Cu-FeCo-IrMn; FeCo alloy; FeCo-Cu; FeCo-NiFe; FeCo-Ru; NiFe seedlayers; Ru seedlayers; damping; dynamical measurements; exchange coupled magnetic soft underlayer; nonexchange coupled magnetic soft underlayer; perpendicular recording; Anisotropic magnetoresistance; Couplings; Damping; Equations; Frequency; Magnetic anisotropy; Magnetic materials; Perpendicular magnetic anisotropy; Perpendicular magnetic recording; Soft magnetic materials;
Conference_Titel :
Magnetics Conference, 2003. INTERMAG 2003. IEEE International
Conference_Location :
Boston, MA, USA
Print_ISBN :
0-7803-7647-1
DOI :
10.1109/INTMAG.2003.1230260
