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PreprintCC BY 4.0arXiv

Indirect Control of Buried CoB Spin Textures via C60-Induced Modification of Ir Spin-Orbit Coupling

  • Colin Kirkbride
  • Christopher E A Barker
  • Timothy Moorsom
  • Kayla Fallon
  • Daniel Roe
  • Trevor Almeida
  • Sara Villa
  • Christopher H Marrows
  • Stephen McVitie
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Abstract

Understanding how organic materials modulate magnetic structure is a central challenge in organic spintronics. Here, we demonstrate that 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). Using Lorentz transmission electron microscopy, the magnetic domain behaviour in field-free and in-situ field environments is measured. In Fresnel mode, we reveal a reduction in magnetic domain periodicity upon C60 deposition. Then, using pixelated 4D-STEM differential phase contrast mode, we establish that this modification arises from a substantial enhancement of effective magnetic anisotropy and interfacial DMI strength. Coupled with bulk magnetometry and micromagnetic simulations, we propose a mechanism based on spin-orbit coupling at the C60/Ir interface which modifies the iDMI and drives a contraction of spin texture density throughout the multilayer stack. These findings extend the impact of organic molecular capping films as effective and accessible routes for engineering spin textures to buried magnetic multilayer systems, with direct implications for the design of next-generation spintronic and neuromorphic devices.

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Cite

BibTeXRIS
BibTeX
@misc{kirkbride2026indirect,
  title = {{Indirect Control of Buried CoB Spin Textures via C$_60$-Induced Modification of Ir Spin-Orbit Coupling}},
  author = {Colin Kirkbride and Christopher E A Barker and Timothy Moorsom and Kayla Fallon and Daniel Roe and Trevor Almeida and Sara Villa and Christopher H Marrows and Stephen McVitie},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.21704},
  eprint = {2610.21704},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.21704},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Indirect Control of Buried CoB Spin Textures via C_60-Induced Modification of Ir Spin-Orbit Coupling
AU  - Colin Kirkbride
AU  - Christopher E A Barker
AU  - Timothy Moorsom
AU  - Kayla Fallon
AU  - Daniel Roe
AU  - Trevor Almeida
AU  - Sara Villa
AU  - Christopher H Marrows
AU  - Stephen McVitie
PY  - 2026
DA  - 2026/10/15
PB  - arXiv
DO  - 10.48550/arxiv.2610.21704
UR  - https://arxiv.org/abs/2610.21704
AB  - Understanding how organic materials modulate magnetic structure is a central challenge in organic spintronics. Here, we demonstrate that C_60 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). Using Lorentz transmission electron microscopy, the magnetic domain behaviour in field-free and in-situ field environments is measured. In Fresnel mode, we reveal a reduction in magnetic domain periodicity upon C_60 deposition. Then, using pixelated 4D-STEM differential phase contrast mode, we establish that this modification arises from a substantial enhancement of effective magnetic anisotropy and interfacial DMI strength. Coupled with bulk magnetometry and micromagnetic simulations, we propose a mechanism based on spin-orbit coupling at the C_60/Ir interface which modifies the iDMI and drives a contraction of spin texture density throughout the multilayer stack. These findings extend the impact of organic molecular capping films as effective and accessible routes for engineering spin textures to buried magnetic multilayer systems, with direct implications for the design of next-generation spintronic and neuromorphic devices.
ER  -