Interplay of Superstructural Ordering and Magnetic Properties of the Sr2FeMoO6-delta Double Perovskite
authors Kalanda, NA; Kovalev, LV; Waerenborgh, JC; Soares, MR; Zheludkevich, ML; Yarmolich, MV; Sobolev, NA
nationality International
journal SCIENCE OF ADVANCED MATERIALS
author keywords Strontium Ferromolybdate; Superstructural Ordering; Magnetic Properties; Mossbauer Effect; Ferromagnetic Resonance
keywords FERROMAGNETIC-RESONANCE; MOSSBAUER-SPECTROSCOPY; ANISOTROPY; MAGNETORESISTANCE; CRYSTALLINE; SOLIDS; MODEL
abstract Strontium ferromolybdate (Sr2FeMoO6-delta, SFMO) is a material exhibiting promising magnetoresistive properties. We have synthesized SFMO samples out of simple oxides (SrCO3, Fe2O3, and MoO3) or partially reduced SrFeO3-x (SFO) and SrMoO4-y (SMO) precursors. The samples have been experimentally investigated using X-ray diffraction, temperature-dependent magnetization, Mossbauer effect and ferromagnetic resonance measurements. Samples of the first type contain a high density of defects, especially [Fe-Mo], [Mo-Fe] antisites, and do not exhibit any superstructural ordering of the iron and molybdenum ions (P=0%). These samples comprise iron cations in a mixed valence state, Fe2+/3+, and are characterized by a higher magnetic inhomogeneity than those synthesized out of precursors. The use of the latter increases the sample density and brings about a growth acceleration, synthesis temperature reduction, as well as the appearance of a superstructural ordering of the Fe3+ and Mo5+ cations with P=64%. The samples exhibit magnetic anisotropy and consist of nanosize grains. Zero-field-cooling measurements of the temperature dependences of the magnetization reveal a sudden leap of the magnetization at low temperatures (below 23 K) that witnesses the existence of magnetic regions with a low coercivity, in which a superparamagnetic state exists. The obtained results are important for the optimization of the synthesis technology of SFMO for device applications.
publisher AMER SCIENTIFIC PUBLISHERS
issn 1947-2935
year published 2015
volume 7
issue 3
beginning page 446
ending page 454
digital object identifier (doi) 10.1166/sam.2015.2134
web of science category Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied
subject category Science & Technology - Other Topics; Materials Science; Physics
unique article identifier WOS:000349140200005
  ciceco authors
  impact metrics
journal analysis (jcr 2017):
journal impact factor 1.318
5 year journal impact factor 1.121
category normalized journal impact factor percentile 25.425
dimensions (citation analysis):
altmetrics (social interaction):



 


Apoio

1suponsers_list_ciceco.jpg