Complex‐Surfactant‐Assisted Hydrothermal Route to Ferromagnetic Nickel Nanobelts

Ferromagnetic metal nanobelts are reported to have been synthesized for the first time in solution by a simple and mild hydrothermal method. The nickel nanobelts (see Figure), which typically had a thickness of ∼15 nm, width of 500–1000 nm, and length of up to 50 μm, showed remarkably enhanced ferromagnetic properties. The method is expected to be transferable to other transition metals.