Gast ::
| Hauptseite > Publikationsdatenbank > Ab initio investigations of spin-orbit functionalized graphene |
| Hauptseite > Publikationsdatenbank > Ab initio investigations of spin-orbit functionalized graphene |
| Book/Dissertation / PhD Thesis | FZJ-2025-03887 |
2025
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag
Jülich
ISBN: 978-3-95806-847-6
This record in other databases:
Please use a persistent id in citations: doi:10.34734/FZJ-2025-03887
Abstract: Graphene (Gr) has obtained significant attention in the realm of advanced information technologies due to its remarkable electronic properties, such as high carrier mobility, an unusual quantum Hall effect, and long spin lifetimes at room temperature. These attributes make Gr a promising candidate for various applications, particularly in spintronics. There, research on Co/Pt(111) ultra-thin films, widely utilized in perpendicular magnetic recording, focuses on enhancing material properties by adding buffer layers and alloying with other elements. This thesis explores the electronic and magnetic properties of Gr when deposited on Co/heavy metal (HM) substrates, particularly focusing on Pt and Ir as HMs. Our investigation aims to elucidate the impact of Gr on Co/HM on magnetic exchange interactions, with a particular focus on understanding the spin-orbit coupling (SOC) effects like magnetocrystalline anisotropy (MCA) and the interfacial Dzyaloshinskii- Moriya interaction (DMI) at both Gr/Co and Co/HM interfaces. These interactions are pivotal in influencing various magnetic dynamics, including ferromagnetic resonance, spin waves, and the behavior of chiral domain walls and skyrmions. Modern electronic systems aspire to achieve high-speed operation and low energy consumption, driving the development of electric-field-controlled spintronic devices. The experimental reports reveal evidence of interfacial DMI at the Gr/Co interface, contrasting with the SOC-induced DMI observed at the Co/HM interface. Additionally, we find that depositing Gr leads to a reduction in DMI, potentially enhancing the susceptibility of these structures to electric fields. Efforts to manipulate DMI and MCA involve the application of electric fields and the introduction of various capping layers, including oxide capping layers and an HM overlayer, to engineer electronic and magnetic properties. Our exploration also extends to Gr-covered Co/Pt multilayers, known for their perpendicular magnetic anisotropy, contributing further to our understanding of the intricate interplay between material compositions and magnetic properties. These insights hold potential implications for engineering DMI and MCA in future spintronic devices. Theoretical advancements, particularly in density functional theory (DFT), play a crucial role in unraveling material properties. The Full-potential Linearized Augmented Planewave (FLAPW) method is renowned for its versatility and accuracy, making it a widely accepted computational approach in materials science. Utilizing the FLAPW method enables us to handle complex systems, encompassing those with heavy atoms and pronounced SOC effects. In this thesis, we utilize the FLEUR code, which employs the film FLAPW method to compute the DMI in the electric field, an essential parameter in spintronics research. Our calculations consider SOC effects both in a first-order perturbation theory for the DMI and self-consistently for the MCA, aiming to stimulate SOC-induced effects and deepen our understanding of these phenomena.
; 
|
The record appears in these collections: |
PDF