AVS 46th International Symposium
    Magnetic Interfaces and Nanostructures Technical Group Tuesday Sessions
       Session MI+VM+AS-TuM

Paper MI+VM+AS-TuM7
Temperature Dependent Characterization of Thermal Stability of Longitudinal Magnetic Recording Media

Tuesday, October 26, 1999, 10:20 am, Room 618/619

Session: Magnetic Recording: Media
Presenter: A. Moser, IBM Almaden Research Center
Authors: A. Moser, IBM Almaden Research Center
D. Weller, IBM Almaden Research Center
E. Fullerton, IBM Almaden Research Center
K. Takano, IBM Almaden Research Center
Correspondent: Click to Email
Temperature dependent characterization of thermal stability was performed on a series of magnetic recording media at temperatures between 300 K and 420 K using a static write/read tester.@footnote 1@ The investigated samples are CoPtCr alloys with thicknesses in the range between 5.5 nm to 13 nm. First, the thermal stability of a recorded bit track was studied by measuring the time-dependence of the read-back amplitude between 0.8 s and 70000 s. Second, the time-dependent coercivity was measured by applying a magnetic field pulse of 5 ns to > 60 s width opposite to the sample's initial magnetization. Finally, the samples were characterized by SQUID magnetometry yielding temperature dependent coercivities, viscosity parameters and irreversible susceptibilities. The measurements are discussed with a quasi-independent particle model. The measured stability ratios (ratio between energy barrier for magnetization reversal to thermal energy) and signal decay rates are found to decrease faster than simple scaling with temperature would predict. @FootnoteText@ @footnote 1@ A. Moser, D. Weller and M.E. Best, J. Appl. Phys. 85, 5018 (1999)