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Theoretical approach and experimental investigation of spin current tunnelling in Ni$_{80}$Fe$_{20}$/Si$_{3}$N$_{4}$/Fe$_{40}$Co$_{37}$Zr$_{11}$N$_{12}$ magnetically collinear trilayer films with defined in-plane uniaxial anisotropy

Seemann, K. ORCID iD icon 1,2
1 Institut für Angewandte Materialien – Angewandte Werkstoffphysik (IAM-AWP), Karlsruher Institut für Technologie (KIT)
2 Zukunftscampus (CAMPUS), Karlsruher Institut für Technologie (KIT)

Abstract (englisch):

Ferromagnetic trilayer film systems with nonferromagnetic Si3N4 interface layers were fabricated by using magnetron sputtering. A post-annealing process was carried out at 400 °C for 2 h in a static magnetic field, in order to induce an in-plane uniaxial anisotropy. The present study introduces the exchange interaction between ferromagnetic layers which influences the static magnetisation properties as well as the natural resonance frequency behaviour and its damping features, i.e., damping and anti-damping effects. This is expressed by the total damping parameter itot = Gi ±spi, which is enhanced or reduced by a spin transfer torque damping parameter ±spi whereupon Gilbert bulk damping Gi is considered to be independent. The static polarisation loops are slightly but noticeably different, caused by an interface with thickness up to 100 nm, which reflects a decreasing exchange interaction. With varying the interface thickness, the films also show a distinct variation in their frequency spectra. This leads to the conclusion that spin currents caused by spin pumping arise, and tunnelling within a Si3N4 insulating barrier generates spin transfer torque. ... mehr


Postprint §
DOI: 10.5445/IR/1000148822
Veröffentlicht am 20.07.2023
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Angewandte Werkstoffphysik (IAM-AWP)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 01.11.2022
Sprache Englisch
Identifikator ISSN: 0304-8853, 1873-4766
KITopen-ID: 1000148822
HGF-Programm 43.31.01 (POF IV, LK 01) Multifunctionality Molecular Design & Material Architecture
Erschienen in Journal of magnetism and magnetic materials
Verlag Elsevier
Band 561
Seiten Art.-Nr.: 169707
Vorab online veröffentlicht am 19.07.2022
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