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Magnetic structure
About: Magnetic structure is a research topic. Over the lifetime, 10787 publications have been published within this topic receiving 207143 citations.
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TL;DR: In this article, the magnetic and magnetoelectric properties of Ba2-xSrxNi2Fe12O22 single crystals over a wide composition range (0,≤ x≤ 1.5) were studied.
Abstract: We studied the magnetic and magnetoelectric properties of Ba2-xSrxNi2Fe12O22 single crystals over a wide composition range (0 ≤ x ≤ 1.5). All the crystals show a ferrimagnetic order at around 660 K. While a Sr-free crystal is simply ferrimagnetic down to the lowest temperature, a transition from the ferrimagnetic into a screw magnetic ordered state was observed at temperatures below 300 K in Sr-substituted crystals. The transition temperature monotonically increases with increasing Sr content, meaning that the screw ordered state is stabilized by the Sr-substitution. By applying a magnetic field perpendicular to the hexagonal c axis, the samples showing the ground-state screw order undergo successive metamagnetic transitions and exhibit magnetically induced ferroelectricity in some of the intermediate magnetic phases. In an intermediate magnetic phase, the largest electric polarization emerges (2 × 102 μC/m2 for x = 1.5 crystal), i.e., magnetoelectric effect. The evolution of the magnetic structures related to the magnetoelectric effect in x = 1.5 crystal was clarified by means of in-field neutron diffraction measurements. Though the magnetoelectric effect in the as-grown crystal was measurable only below ∼100 K due to its low resistivity, a post-annealing drastically enhances the resistivity and allows us to observe the magnetically induced ferroelectricity up to ∼175 K.
50 citations
TL;DR: In this paper, the crystal structures and magnetic properties of quaternary oxides Ba3LnIr2O9 (Ln = Y, lanthanides) are reported.
Abstract: The crystal structures and magnetic properties of quaternary oxides Ba3LnIr2O9 (Ln = Y, lanthanides) are reported Rietveld analyses of their x-ray diffraction data indicate that they adopt the 6H-perovskite-type structure with space group P63/mmc or, in the case of Ln = La and Nd only, a monoclinically distorted structure with space group C 2/c They have the valence state of Ba3Ln4+Ir24+O9 (for Ln = Ce, Pr, and Tb) or Ba3Ln3+Ir245+O9 (for Ln = Y and other lanthanides) Measurements of the magnetic susceptibility and specific heat were carried out for Ln = Y, Ce, Pr, Tb, and Lu It was found that the effective magnetic moment of Ir ions is significantly small, which indicates the existence of the strong antiferromagnetic interaction between Ir ions in the Ir2O9 bioctahedra The Y and Lu compounds with an unpaired magnetic moment remaining in the Ir245+O9 show an antiferromagnetic transition at 40 and 51 K, respectively For Ba3TbIr2O9, a long-range magnetic ordering of Tb4+ ions was found at 20 K
50 citations
TL;DR: Nd 3 ReO 7 and Pr 3 REO 7 were prepared by solid-state reaction involving Ln 2 O 3, ReO 3 and ReO 2 in sealed quartz tubes and a carefully controlled thermal sequence.
50 citations
TL;DR: In this paper, two triangular models for the magnetic structure of MnYO/sub 3, proposed to explain the neutron-diffraction data for this compound, are compared and a weak parasitic ferromagnetism that is observed allows a choice to be made between the two models.
50 citations
TL;DR: In this article, the magnetic properties of phase-separated La 0.4 Dy 0.1 Ca 0.5 MnO 3 polycrystalline bulk sample have been investigated.
50 citations