Room-temperature ferromagnetism and oxygen pressure-dependent optical, ferromagnetic properties in SrSn_0.5Co_0.5O₃ thin films

Abstract

Room-temperature ferromagnetism was obtained in SrSn 0.5 Co 0.5 O 3 (SSCO) epitaxial film on SrTiO 3 substrate by pulsed laser deposition, and the effects of oxygen pressure (P O2 ) on the microstructure, optical and magnetic properties were examined. An interesting hybrid epitaxial film embedded with polycrystalline SSCO and SrCoO x nanoparticles was observed. The increase of P O2 relaxed the film/substrate compressive strain, promoted the growth of crystallites and reduced the optical band gap (from 2.43 to 1.68 eV). The SSCO film deposited at 0.1 Pa exhibited good ferromagnetism at 100-300 K, while the ferromagnetism in the film with higher and lower oxygen pressure (1 Pa and 10 −4 Pa) was weak. IMPACT STATEMENTRoom-temperature ferromagnetism and tunable optical band gap (2.34-1.68 eV) were demonstrated in Co-doped SrSnO 3 thin film grown on SrTiO 3 single-crystal substrate by pulsed laser deposition with varying oxygen pressure.