Ultra-high resistive and anisotropic CoPd–CaF2 nanogranular soft magnetic films prepared by tandem-sputtering deposition
| Autor: | Nobukiyo Kobayashi, Iwasa Tadayoshi, Shigehiro Ohnuma, Ken Ichi Arai, Hiroshi Masumoto, Masayuki Naoe |
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| Rok vydání: | 2015 |
| Předmět: |
Resistive touchscreen
Materials science Annealing (metallurgy) business.industry Band gap Nitride Sputter deposition Condensed Matter Physics Ferromagnetic resonance Electronic Optical and Magnetic Materials Nuclear magnetic resonance Electrical resistivity and conductivity Optoelectronics business Anisotropy |
| Zdroj: | Journal of Magnetism and Magnetic Materials. 391:213-222 |
| ISSN: | 0304-8853 |
| Popis: | Ultra-high resistive and anisotropic soft magnetic films for gigahertz applications are desirable to demonstrate the really practical films. Here we present a study of novel nanogranular films fabricated by tandem-sputtering deposition. Their electromagnetic properties and nanostructure have also been discussed. These films consisted of nanocrystallized CoPd alloy-granules and CaF2 matrix, and a specimen having a composition of (Co0.69Pd0.31)52–(Ca0.31F0.69)48 exhibited distinct in-plane uniaxial anisotropy after uniaxial field annealing with granule growth. Its complex permeability spectra have a ferromagnetic resonance frequency extending to the Super-High-Frequency band due to its higher anisotropy field, and its frequency response was quite well reproduced by a numerical calculation based on the Landau–Lifshitz–Gilbert equation. Furthermore, it was clarified that the CaF2-based nanogranular film exhibits a hundredfold higher electrical resistivity than conventional oxide or nitride-based films. Higher resistivity enables the film thickness to achieve a margin exceeding threefold against eddy current loss. The greater resistivity of nanogranular films is attributed to the wide energy bandgap and superior crystallinity of CaF2 matrix. |
| Databáze: | OpenAIRE |
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