Figure 4: Effects of cyclic annealing in different environments.
From: Room temperature ferromagnetism in Teflon due to carbon dangling bonds
(a) Hysteresis loops of Teflon tape after annealing in pure Ar (black), after storage in desiccator for 25 days (red) and after the exposure in air for 25 days (blue). (b) Saturation magnetization of Teflon tapes after annealing at 150 °C under different atmospheres. (c) Saturation magnetization Ms of Teflon tape subjected to alternative annealing in pure Ar (black full-square) and water steam (blue open square) at 150 °C for 2 h (the violet star represents the as-received tape). (d) Saturation magnetization M of Teflon tape (violet star for as-received), subjected to annealing under pure Ar (black full square), subsequently annealed under 2.5% H2/Ar (magenta open circle), and again under pure Ar (black full square) at 150 °C for 2 h. Each magnetization value (M) is averaged from measurements of three samples.
