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Perpendicular magnetic anisotropy properties of CoFeB/Pd multilayers
Jong Ho Jung1, Sang Ho Lim, Seong-Rae Lee
1Department of Materials Science and Engineering, Korea University, Seoul 136-713, Korea.
Journal of Nanoscience and Nanotechnology
|November 30, 2011
Summary
Perpendicular magnetic anisotropy (PMA) in CoFeB/Pd multilayers is enhanced by increasing palladium thickness and is stronger on glass substrates. These findings are crucial for developing advanced magnetic storage materials.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Perpendicular magnetic anisotropy (PMA) is essential for high-density magnetic storage devices.
- Understanding the influence of layer thickness and substrate on PMA is critical for material optimization.
Purpose of the Study:
- To investigate the effects of CoFeB and Pd layer thicknesses on the PMA of CoFeB/Pd multilayers.
- To evaluate the impact of different substrates (glass and MgO) on PMA properties.
- To elucidate the relationship between interface quality, layer thickness, and observed magnetic anisotropy.
Main Methods:
- Fabrication of CoFeB/Pd multilayer thin films with varying layer thicknesses.
- Characterization of magnetic properties, specifically perpendicular magnetic anisotropy (PMA).
- Analysis of the influence of substrate type (glass vs. MgO) on PMA.
Main Results:
- Strong PMA was observed at low CoFeB thicknesses (0.3-0.5 nm) across a range of Pd thicknesses (0.47-1.26 nm).
- PMA generally increased with increasing Pd thickness, attributed to smoother interfaces and enhanced surface anisotropy.
- Glass substrates yielded stronger PMA compared to MgO substrates.
Conclusions:
- Optimizing CoFeB and Pd layer thicknesses is key to achieving strong PMA.
- Interface quality significantly impacts magnetic anisotropy, with smoother interfaces promoting stronger PMA.
- Substrate choice plays a vital role in determining the PMA of CoFeB/Pd multilayers, with glass offering superior performance in this study.
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