Structural, magnetic and electronic properties of pulsed-laser-deposition grown SrFeO3−δ thin films and SrFeO3−δ/La2/3Ca1/3MnO3 multilayers. (14th November 2017)

• Record Type: Journal Article
• Authors: Perret, E; Sen, K; Khmaladze, J; Mallett, B P P; Yazdi-Rizi, M; Marsik, P; Das, S; Marozau, I; Uribe-Laverde, M A; de Andrés Prada, R; Strempfer, J; Döbeli, M; Biškup, N; Varela, M; Mathis, Y-L; Bernhard, C
• Is Part Of: Journal of physics. Volume 29:Number 49(2017)
• Publication Date: 2017-11-14
• Subjects: thin films and multilayers -- complex oxides -- SrFeO3 -- magnetism -- exchange bias; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/1361-648X/aa93a6
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: We studied the structural, magnetic and electronic properties of S r F e O 3 − δ (SFO) thin films and S r F e O 3 − δ / L a 2 / 3 C a 1 / 3 MnO3 (LCMO) superlattices that have been grown with pulsed laser deposition (PLD) on L a 0.3 S r 0.7 A l 0.65 T a 0.35 O 3 (LSAT) substrates. X-ray reflectometry and scanning transmission electron microscopy (STEM) confirm the high structural quality of the films and flat and atomically sharp interfaces of the superlattices. The STEM data also reveal a difference in the interfacial layer stacking with a SrO layer at the LCMO/SFO and a LaO layer at the SFO/LCMO interfaces along the PLD growth direction. The x-ray diffraction (XRD) data suggest that the as grown SFO films and SFO/LCMO superlattices have an oxygen-deficient S r F e O 3 − δ structure with I4/ mmm space group symmetry ( δ ⩽ 0.2 ). Subsequent ozone annealed SFO films are consistent with an almost oxygen stoichiometric structure ( δ ≈ 0 ). The electronic and magnetic properties of these SFO films are similar to the ones of corresponding single crystals. In particular, the as grown S r F e O 3 − δ films are insulating whereas the ozone annealed films are metallic. The magneto-resistance effects of the as grown SFO films have a similar magnitude as in the single crystals, but extend over a much wider temperature range. Last but not least, for the SFO/LCMO superlattices we observe a rather large exchange bias effect that varies as a function of the cooling field.