Fig. 2: Type I microheater.

a Bowtie-shaped microheater with 30 nm-thick Sb2Se3. b Reversible switching using 3.4 V–0.1 ms to partially crystallize, 3.4 V–1 ms to crystallize fully, and 21 V–400 ns to amorphize. c Spectra for a ring resonance showing the cycles highlighted in (b).