Quantum papers — 2026-10-20
The Morning Preprint — this day as one edition: the day's papers, the five things worth knowing, and the episodes behind them.
Today's focus is on how we can control buried magnetic structures in multilayer systems, which is crucial because understanding these organic material effects opens up new ways to design spintronic and neuromorphic devices. The most significant work involves demonstrating that C 60 molecular films strongly influence the buried magnetic spin texture in Pt/CoB/Ir based multilayer systems that feature interfacial Dzyaloshinskii-Moriya interaction.
Using Lorentz transmission electron microscopy, the team observed a reduction in magnetic domain periodicity when C 60 was deposited, which suggests a change in how the magnetic domains are organized. Further investigation using pixelated 4D-STEM differential phase contrast mode showed this change is due to an increase in effective magnetic anisotropy and stronger interfacial DMI strength. This modification stems from spin-orbit coupling at the C 60 /Ir interface, which alters the iDMI and causes a contraction of the spin texture density across the entire multilayer stack.
This work builds on previous insights into organic materials affecting magnetism, as seen in AKMPC. The mechanism proposed suggests that these molecular capping films offer an accessible route for engineering spin textures in buried magnetic layers, which is a key takeaway for future device design efforts.
Today's papers
- Indirect Control of Buried CoB Spin Textures via C 60-Induced Modification of Ir Spin-Orbit Coupling Understanding how carbon nanotubes change the magnetic structure in cobalt based multilayer systems using iridium. [paper] [episode]
The papers
- Indirect Control of Buried CoB Spin Textures via C 60-Induced Modification of Ir Spin-Orbit Coupling — The gist: C60 molecular films exert a pronounced and quantifiable influence on the buried magnetic spin texture in [Pt/CoB/Ir] based multilayer systems hosting interfacial Dzyaloshinskii–Moriya interaction (iDMI). [episode]
Important terms
- Buried magnetic structures
- These are magnetic features located deep within a multilayer system, which are important to control for designing new spintronic and neuromorphic devices.
- C60 molecular films
- These carbon molecules act as a capping layer that strongly influences the magnetic spin texture in the multilayer structure.
- Dzyaloshinskii-Moriya interaction (DMI)
- This is an interfacial interaction that affects how magnetic domains are organized, and it is enhanced by the presence of C60 films.
- Lorentz transmission electron microscopy
- This technique was used to observe a reduction in the periodicity of magnetic domains after depositing C60 films.
- Spin-orbit coupling
- This fundamental physical effect at the C60/Ir interface is responsible for increasing the effective magnetic anisotropy and strengthening DMI.