Double-Perovskite Sr2FeMoO6 Thin Films Prepared by Using Pulsed Laser Deposition: Growth and Crystal, Electronic and Magnetic Structures

Abstract
We grew double-perovskite ${m Sr_2FeMoO_6}$ thin films by using pulsed laser deposition (PLD) and systematically investigated the effects of the deposition temperature ($T_D$) variation on their crystal structure, electronic valence state, electrical transport, and magnetic properties. The $B$-site double-perovskite Fe/Mo ion ordering and the saturated magnetization ($M_s$) were optimized at $T_D=m 850~^circ$C while their suppressions were observed at above $m 900~^circ$C. For the samples with $T_D geq m 900 ~^circ$C, the grain structure should be included in considerations to understand the behavior of the resistivity. The valence states of the Fe and Mo ions also depended on $T_D$; mixed (singly)-valence Fe states were exhibited for the $B$-site ordered (disordered) film. These observations indicate that the $T_D$ plays a crucial role in the growth of double-perovskite ${m Sr_2FeMoO_6}$ thin films and determines their physical properties.
Keywords: Thin film, ${m Sr_2FeMoO_6}$, Ferrimagnetics

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