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The bond random mixed compound Fe(Br0.9I0.1)2 has been studied by magnetization and Mössbauer measurements. Although the zero-field cooled and field-cooled magnetization variations are not like a typical spin glass one, the Mössbauer spectrum below Néel temperature shows a hyperfine field distribution. It implies that the 10% FeI2 mixed in FeBr2 can be induced by the bond random effect which causes the sample to exhibit a spin glass-like behavior. [ABSTRACT FROM AUTHOR]

Abstract: Tb–Fe–Co/Co–Cr–Pt–B hybrid media with various Tb–Fe–Co thicknesses were prepared in order to investigate high-density recording characteristics and thermal decay. As a result, the magnetic cluster size of hybrid media increased in proportion to the Tb–Fe–Co thickness. The hybrid media with 7.5nm thickness of Tb–Fe–Co showed the highest signal-to-noise ratio and low thermal decay. [Copyright &y& Elsevier]

Abstract: The dependence of magnetic properties on thermal fluctuation and relationship between magnetic cluster size and thermal decay are investigated. It is shown that the use of the thermal stability factor explains the thermal decay of a perpendicular magnetic recording medium well when the magnetic cluster volume in AC erased magnetization is regarded as the effective volume. [Copyright &y& Elsevier]