Giant Spin Pumping at Polymer/Ferromagnet Interfaces for Hybrid Spintronic Devices
Journal article, 2025
While the growing utilization of polymers in flexible electronic devices has sparked significant interest in polymer/metal interfaces, spintronic studies of such interfaces remain limited. Here, spin pumping across a polymer/ferromagnet metal interface is systematically studied between hydrogen silsesquioxane (HSQ) oligomer layers (t(HSQ) = 30, 36, 48 nm) and NiFe (t(NiFe) = 4, 5, 7, 10 nm) thin films. Using ferromagnetic resonance measurements, strong spin pumping (large linewidth broadening) and a giant spin mixing conductance, reaching 19.8 nm(-2) for HSQ = 48 nm are observed, i.e. comparable to that of heavy metals. The results suggest efficient spin transfer across the HSQ/NiFe interface, possibly originating from a combination of spin and orbital pumping, and provide valuable insights for designing self-powered and flexible spintronic devices utilizing polymers in combination with ferromagnetic materials.
spin-orbital pumping
FMR
spintronics
spin mixing conductance
gilbert damping constant
Author
Shiva Gaur
The NorthCap University
Akash Kumar
University of Gothenburg
The NorthCap University
Tohoku University
Himanshu Himanshu
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
Utkarsh Shashank
University of Gothenburg
Hukum Singh
The NorthCap University
Saroj Prasad Dash
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
Anubhav Raghav
The NorthCap University
Johan Akerman
University of Gothenburg
Advanced Materials Interfaces
2196-7350 (eISSN)
Vol. 12 13 2500306Subject Categories (SSIF 2025)
Condensed Matter Physics
DOI
10.1002/admi.202500306