Fabrication, characterization and testing of (111) FePt L1<sub>0</sub> for heat assisted magnetic recording

D. Karns; J. Y. Kim; B. Lu; G. Ju; X. Wu; E. Gage; A. Roy

doi:10.1117/12.667923

20 January 2006 Fabrication, characterization, and testing of (111) FePt L1₀ for heat assisted magnetic recording

D. Karns, J. Y. Kim, B. Lu, G. Ju, X. Wu, E. Gage, A. Roy

Proceedings Volume 6027, ICO20: Optical Information Processing; 60270X (2006) https://doi.org/10.1117/12.667923
Event: ICO20:Optical Devices and Instruments, 2005, Changchun, China

Abstract

The fabrication, characterization and recording of granular FePt L1₀ (111) oriented media are discussed. The granular structure is obtained through the addition of SiO₂ during the deposition. It exhibited grain sizes less than 10 nm on average after post annealing. The effect of adding SiO₂ is examined in the following manner. The crystallographic structure is examined through X-ray diffraction. The microstructures of the grains are observed by transmission electron microscopy. Hysteresis loops were obtained with a custom built polar magneto optic Kerr effect magnetometer (PMOKE) with field range up to 20 kOe and a Quantum Design SQUID magnetometer with field capability up to 50 kOe. Heat assisted magnetic recording was performed utilizing a custom designed and built heat assisted magnetic recording spin stand. The heat assisted magnetic recording spin stand was utilized to examine incident laser power requirements along with applied magnetic flux density requirements for recording. Data was successfully recorded and readout on high anisotropy FePt L1₀ (111) media that was not writable with perpendicular magnetic recording techniques. Recording results indicate that due to the high Curie temperature and large magnetization, a large applied magnetic flux density and a high recording temperature are required for saturation recording.

Citation Download Citation

D. Karns, J. Y. Kim, B. Lu, G. Ju, X. Wu, E. Gage, and A. Roy "Fabrication, characterization, and testing of (111) FePt L1₀ for heat assisted magnetic recording", Proc. SPIE 6027, ICO20: Optical Information Processing, 60270X (20 January 2006); https://doi.org/10.1117/12.667923

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