Vortex tuning magnetization configurations in porous Fe3O4 nanotube with wide microwave absorption frequency

The design and optimization of one-dimension (1D) magnetic material are great importance for the energy conversion, storage spin electron devices, which remain a huge challenge. Herein, 1D porous Fe3O4 nanotubes (NTs) have been fabricated via combined process electrospinning calcination. In precursors, by regulating content ratio between two types polyvinyl pyrrolidone with different molecular weight, NTs vortex-domain configuration fabricated. Based on unique nanotube structure encapsulated multi-domains, composite exhibit high complex permeability (μ′, μ″) values, hold both strong dissipation capacity. Our excellent microwave absorption (MA) performance maximum reflection loss value −57.1 dB efficient bandwidth 12.0 GHz. generated vortices make crucial contribution to spin-wave resonance improves MA under high-frequency. Related flux line distribution domain moment were confirmed holography micro-magnetic simulation, respectively, providing deep insight mechanism.