ＰｔＭｎＳｂ薄膜の磁性および力一効果

概要

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Dependence of magnetic properties and Kerr effects in PtMnSb thin films on oxygen partial pressure during annealing was investigated. Coercivity Hc(⊥) increased as the oxygen partial pressure increased, while the change in Hc(//) was relatively small. Saturation magnetization (Ms) was almost constant up to 6 × 10-4 Torr, and then decreased rapidly above that pressure. Kerr rotation angle at nonmagnetic field (θk(0)) and square ratio (Rs) of Kerr loops have maximum values at around 8 × 10-4 Torr and these are 0.85° and 0.45, respectively. SEM observation and X-ray diffraction clarified that these values are related to the preferential oxidation at PtMnSb columnar boundaries. The oxidation may shorten the size of columns and isolate them from each other.
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