A (111)-ordered Sr 2 FeRuO 6 superlattice displays room-temperature magnetic ordering
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A (111)-ordered Sr2FeRuO6 superlattice displays roomtemperature magnetic ordering
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xide heterostructures displaying interfacial magnetic order have been the subject of much study but their use is currently limited by low magnetic ordering temperatures. In the May 5 online edition of Chemistry of Materials (DOI: 10.1021/cm200454z), S.-K. Kim at Seoul National University and his colleagues report on the growth of (111)-oriented Sr2FeRuO3 superlattices having a robust ordered-double-perovskite structure that display magnetic ordering up to 390 K. The researchers managed to overcome thermodynamic barriers to (111)-oriented growth by using a thin SrRuO3 buffer layer deposited on Ti4+-terminated SrTiO3 (111) as a template. They then deposited 55 alternating layers of SrFeO3 and SrRuO3 to build up a superlattice while maintaining precise structural and
chemical control over each layer. Using a combination of reflection high energy electron diffraction, x-ray diffraction, and transmission electron microscopy, the researchers confirmed the Ordered-double-perovskite structure of Sr2FeRuO3 shows structure of the stacking of Ru and Fe ions in (111) planes. Reprinted with permission from Chem. Mater. (May 5, 2011), DOI: 10.1021/ superlattices. cm200454z. ©2011 American Chemical Society. They probed the temperature-deferromagnetic order stabilized by the adpendent magnetization of the structure dition of Ru5+ ions. and found that it possesses a magneticThe researchers said that their ordering (ferromagnetic or ferrimagnet(111)-ordered superlattice-growth ic) critical temperature (Tc) of ~390 K, more than double the Tc of isolated method may be applied to the growth of SrRuO3 and SrFeO3. They attribute this different oxide systems to achieve new unusual behavior to band broadening and kinds of room-temperature electronic electron transfer that typically occur in and magnetic ordering. ordered double perovskites, as well as Steven Spurgeon
ity. By using an electroactive polymer actuator to apply pressure to the liquid, a research team at Samsung Advanced Institute of Technology has fabricated eveloping microlenses with focustunable microlenses which operate at ing capability is becoming increaslow voltages and can be microfabricated ingly desirable for use in microimaging in large arrays. systems such as those found in mobile In the May 15 issue of Optics Letters phone cameras. A flexible cavity filled (DOI: 10.1364/OL.36.001920; p. 1920), with liquid forms a lens which can be deS.T. Choi and co-workers describe their formed and focused simply by the movedevice based on a silicon frame sandment of liquid into or out of the cavwiched between the elastomer polydimethoxylsilane (PDMS) on one EAP actuator Transparent side and glass elastomer membrane on the other. The silicon is shaped so as to form a 2.4 mm diameter central circle for Glass the lens, linked Optical fluid Si frame to four surrounding reservoirs Schematic diagram of the varifocal microlens, based
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