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Donghyeon Lee,Donghyeon Han,Seyeop Jung,Nyunjong Lee,Suzuki Ippei,Takahashi Yukiko,Sanghoon Kim 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.1
A granular magnetic thin film is a well-known material system for achieving an ultra-high density recording media. Such nano-scale segregation of magnetic elements with excellent thermal stability can be made in the thin film. This material system typically consists of small grains in a few nanometers scale which is isolated by few nanometer-thick boundary. FePt-C is the most popular material for the hard disk drive industry. In general, L1<sub>0</sub>-structured FePt grains surrounded by C are placed on an MgO layer. Grain size in the film varies in a range between 7 nm~20 nm. Magnetic easy axis of each grain is also deviated from the vertical direction to the plane. In this presentation, we suggest the Stoner-Wohlfarth model with the standard deviation of the magnetic easy axis to understand the magnetization switching behavior of the FePt-C thin film. From our model, we can quantify a degree of deviation of the magnetic easy axis in the FePt-C granular film.