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Perpendicular magnetic anisotropy in amorphous ferromagnetic CoSiB/Pt multilayers.
1Department of Electronics Engineering and Institute of Nano Science and Technology, Hanyang University, Seoul 133-791, Korea.
Journal of Nanoscience and Nanotechnology
|March 31, 2011
Summary
This study investigated amorphous ferromagnetic CoSiB/Pt multilayers, finding that layer thickness affects magnetic properties. Annealing at 350°C maintained high perpendicular magnetic anisotropy (PMA) and increased coercivity.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Amorphous ferromagnetic CoSiB/Pt multilayers are explored for magnetic applications.
- Understanding magnetic anisotropy is crucial for device performance.
Purpose of the Study:
- To systematically investigate the magnetic anisotropy properties of CoSiB/Pt multilayers.
- To determine the influence of CoSiB and Pt layer thicknesses on magnetic characteristics.
- To assess the impact of annealing on the magnetic properties of these multilayers.
Main Methods:
- Fabrication of [CoSiB t(coSiB)Pt t(Pt)]5 multilayer series.
- Systematic variation of CoSiB layer thickness (t(coSiB)) and Pt layer thickness (t(Pt)).
- Characterization of magnetic properties including perpendicular magnetic anisotropy (PMA) and coercivity (H(c)).
- Annealing experiments at 350°C.
Main Results:
- Perpendicular coercivity (H(c)) showed a maximum with increasing t(coSiB) and t(Pt), attributed to interface intermixing.
- High perpendicular magnetic anisotropy (PMA) (K(u) of 2 x 10^6 erg/cc) and coercivity (H(c) of 360 Oe) were achieved.
- Amorphous CoSiB's soft magnetic nature made coercivity highly sensitive to its layer thickness.
- Annealing at 350°C preserved high PMA and further increased H(c).
Conclusions:
- Interface engineering through controlled layer thickness is key to optimizing PMA in CoSiB/Pt multilayers.
- These materials demonstrate robust magnetic properties suitable for potential applications.
- Thermal stability is confirmed, with annealing enhancing desirable magnetic characteristics.
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