Impact of ferromagnetic layer thickness on the spin pumping in Co60Fe20B20/Ta bilayer thin films
| Autor: | Nilamani Behera, Ankit Kumar, Rahul Gupta, Lalit M. Pandey, Soumyarup Hait, Sujeet Chaudhary, Vineet Barwal, Peter Svedlindh, Nanhe Kumar Gupta, Sajid Husain |
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| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Spin pumping Amorphous metal Materials science Spintronics Condensed matter physics Bilayer Condensed Matter Physics 01 natural sciences Ferromagnetic resonance Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Amorphous solid Condensed Matter::Materials Science Ferromagnetism 0103 physical sciences Electrical and Electronic Engineering Thin film |
| Zdroj: | Journal of Materials Science: Materials in Electronics. 32:12453-12465 |
| ISSN: | 1573-482X 0957-4522 |
| DOI: | 10.1007/s10854-021-05876-9 |
| Popis: | We report the tuneable spin angular momentum transfer (spin pumping) from Co60Fe20B20 (CFB) amorphous alloy into the Ta heavy metal nanolayers. All the films are grown on Si (100) substrate at room temperature using ion-beam sputtering technique. Structural studies reveal that the grown Ta films over amorphous CFB are crystalline even at ultrathin regime. The bilayers possess very low interface roughness (i.e., follows ballistic spin transport) in two series of CFB (4nm)/Ta (0-10nm) and CFB(6nm)/Ta (0-10nm) bilayers, which is characteristic of normal spin pumping. However, the anomalous behaviour has been observed for CFB (8nm)/Ta (0-10nm) bilayer series where the spin current generated in Ta with the thicker CFB behaves oppositely. The results demonstrate the strong dependence of ferromagnet thickness on the spin pumping into the Ta nanolayers. This study paves the way to choose suitable ferromagnetic layer thickness for spin current induced switching applications in spintronics. |
| Databáze: | OpenAIRE |
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