Tunable Magnetic Properties in Sr<sub>2</sub>FeReO<sub>6</sub> Double-Perovskite.
basic_science · Level V
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- Record sourced from PubMed, PMID 36524710.
- Also identified by DOI 10.1021/acs.nanolett.2c03206.
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Abstract
Double-perovskite oxides have attracted recent attention due to their attractive functionalities and application potential. In this paper, we demonstrate the effect of dual controls, i.e., the deposition pressure of oxygen (<i>P</i><sub>O<sub>2</sub></sub>) and lattice mismatch (ε), on tuning magnetic properties in epitaxial double-perovskite Sr<sub>2</sub>FeReO<sub>6</sub> films. In a nearly lattice matched Sr<sub>2</sub>FeReO<sub>6</sub>/SrTiO<sub>3</sub> film, the ferrimagnetic-to-paramagnetic phase transition occurs when <i>P</i><sub>O<sub>2</sub></sub> is reduced to 30 mTorr, probably due to the formation of Re<sup>4+</sup> ions that replace the stoichiometric Re<sup>5+</sup> to cause disorders of B-site ions. On the other hand, a large compressive strain or tensile strain shifts this critical <i>P</i><sub>O<sub>2</sub></sub> to below 1 mTorr or above 40 mTorr, respectively. The observations can be attributed to the modulation of B-site ordering by epitaxial strain through affecting elemental valence. Our results provide a feasible way to expand the functional tunability of magnetic double-perovskite oxides that hold great promise for spintronic devices.