The time dependence of materials for magnetic recording media, both particles and thin films, is studied. The stability, as deduced from the magnetization decay, magnetic viscosity and fluctuation field, is greater in undoped materials with good morphological and structural order. The activation volume is smaller than the physical size in all the particulate materials, and related to the magnetization switching: it shows relative decrease when the reversal does not take place by coherent rotation, as it occurs in doped particles, or when the particles are composed of segregated sub-units. © 1999 Elsevier Science B.V. All rights reserved.
Thermal relaxation of the magnetization in recording media
BOTTONI, Gian Carlo;CANDOLFO, Donato;CECCHETTI, Antonio
1999
Abstract
The time dependence of materials for magnetic recording media, both particles and thin films, is studied. The stability, as deduced from the magnetization decay, magnetic viscosity and fluctuation field, is greater in undoped materials with good morphological and structural order. The activation volume is smaller than the physical size in all the particulate materials, and related to the magnetization switching: it shows relative decrease when the reversal does not take place by coherent rotation, as it occurs in doped particles, or when the particles are composed of segregated sub-units. © 1999 Elsevier Science B.V. All rights reserved.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
