Title :
Mechanism of domain expansion in MAMMOS
Author :
Herget, P. ; Schlesinger, T.E. ; Stanci, D.D.
Author_Institution :
Data Storage Syst. Center, Carnegie Mellon Univ., Pittsburgh, PA, USA
Abstract :
A magnetic amplifying magneto-optical system (MAMMOS) model has been constructed in which it computes the expanded domain shape by calculating the forces on the domain wall due to the laser heating and due to the data dependent storage layer fields. It is found that a critical parameter governing final domain size is the ratio of the nucleation coercivity, Hc_n, to the wall motion coercivity, Hc_m. Simulation results for the expanded domain area vs. coercivity factor indicate that a coercivity factor or 5 or more is needed to reach spot size of a 650 nm laser. Experimentally, the ratio of Hc_n/Hc_m in the MAMMOS readout layer is 13, while the large scale value is measured to be 1.10.
Keywords :
coercive force; laser beam effects; magnetic domain walls; magnetic storage; magneto-optical recording; nucleation; 650 nm; coercivity factor; critical parameter; data dependent storage layer fields; domain expansion mechanism; domain shape; domain size; domain wall; expanded domain area; laser heating; magnetic amplifying magneto-optical system model; nucleation coercivity; wall motion coercivity; Area measurement; Coercive force; Force measurement; Laser modes; Magnetic domains; Magnetic field measurement; Magnetic properties; Motion measurement; Shape measurement; Volume measurement;
Conference_Titel :
Magnetics Conference, 2005. INTERMAG Asia 2005. Digests of the IEEE International
Print_ISBN :
0-7803-9009-1
DOI :
10.1109/INTMAG.2005.1463545
