Structural and Ferromagnetic Properties of Sputtered FeCoB/AlN Soft Magnetic Multilayers for GHz Applications
| Autor: | Jean-Philippe Michel, Daniel Schneider, M. Meduna, Claudiu V. Falub, Josef Zweck, Hartmut Rohrmann, Jan H. Richter, H. Sibuet, Rachid Hida, Martin Bless |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Materials science Condensed matter physics Ferromagnetic material properties Magnetic domain 02 engineering and technology Coercivity 021001 nanoscience & nanotechnology 01 natural sciences Ferromagnetic resonance Magnetic susceptibility Electronic Optical and Magnetic Materials Condensed Matter::Materials Science Magnetic anisotropy Magnetic shape-memory alloy 0103 physical sciences Electrical and Electronic Engineering 0210 nano-technology Saturation (magnetic) |
| Zdroj: | IEEE Transactions on Magnetics. 53:1-6 |
| ISSN: | 1941-0069 0018-9464 |
| Popis: | Owing to their large saturation magnetization and low hysteresis loss, soft magnetic layers based on amorphous alloys currently receive great attention for their potential for gigahertz frequencies applications. In this paper, we studied the structural and magnetic properties of amorphous FeCoB/AlN multilayered thin films with in-plane uniaxial magnetic anisotropy based on the Fe-28%Co-20%B (at. %) alloy, deposited on 8” Si/200 nm-thermal-SiO2 wafers in an industrial, high-throughput magnetron sputtering system. Depending on the process conditions and hardware configuration, the multilayers exhibit structural anisotropy consisting of surface ripples elongated perpendicular to the incident flux direction, which replicate through the entire multilayer stack. By varying the AlN interlayer thickness and sputter process parameters the anisotropy field $H_{k}$ of these films was tuned in the range of 25–130 Oe, while the coercivity along the magnetic easy axis $H_{c}$ was kept low, 0.2–0.3 Oe. The ferromagnetic resonance frequency of the multilayered structures was ~2 GHz, and the experimental behavior of the magnetization dynamics was described by the classical Landau–Lifschitz–Gilbert model. Magnetic domain imaging confirmed a strong coupling between the adjacent FeCoB layers, in agreement with the edge-curling wall model. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|