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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 paper, the structure of weakly magnetic and strongly magnetic iron sulphide was examined using high-resolution imaging and electron diffraction in a transmission electron microscope (TEM), the measurements of magnetisation versus field and temperature, extended X-ray absorption fine-structure (EXAFS) spectroscopy and neutron diffraction.
158 citations
TL;DR: In this article, the magnetic structure in the antiferromagnetic region between 179° and 87°K closely resembles a helical-type arrangement of the atomic moments, where the moments within a hexagonal layer are aligned parallel and point in a direction perpendicular to the c axis of the crystal.
Abstract: Neutron diffraction measurements on a single crystal of dysprosium show that the magnetic structure in the antiferromagnetic region between 179° and 87°K closely resembles a helical-type arrangement of the atomic moments. In this arrangement the moments within a hexagonal layer are aligned parallel and point in a direction perpendicular to the c axis of the crystal. The moment direction in adjacent layers is rotated by a specific angle which is dependent on the temperature of the sample. A slight modification of this structure exists below about 140°K, and a transition to ferromagnetism occurs at 87°K.
157 citations
TL;DR: In this paper, the bulk and surface properties of spinel oxide Co3O4 have been investigated and the bulk magnetic structure is calculated to be antiferromagnetic, with a Co2+ moment of 2.631 μB.
157 citations
TL;DR: In this paper, the authors used X-ray diffraction, neutron diffraction and magnetometric methods to obtain a model of the spiral magnetic structure of NiMnGe and found that at temperature Tt = 185 K the spiral axis is in the bc-plane.
Abstract: NiMnGe is investigated by means of X-ray diffraction, neutron diffraction, and magnetometric methods. The orthorhombic distorsion of hexagonal lattice is observed below 470 K. The compound NiMnGe is antiferromagnetic with a Neel temperature TN = 346 K. The jump observed at temperature Tt = 185 K on the temperature dependence of magnetic susceptibility points at the change of a magnetic structure. From the analysis of the neutron diffraction patterns the following models of spiral magnetic structure are obtained; at T < Tt the spiral axis is in the bc-plane. The angle between the spiral axis and the b-axis is 45°, magnetic moment at 80 K is 2.75μB; at Tt < T < TN the spiral axis is along the a-axis. The magnetic moment at 295 K is 2.2μB.
153 citations
TL;DR: In this article, a series of magnetized and unmagnetized ferromagnetic materials were studied and the magnetic properties of these materials were investigated using a monochromatic beam polarization method, which was found to compare favorably with other methods with respect to polarization value, beam intensity, and ease of obtainment.
Abstract: Neutron diffraction studies are reported on a series of magnetized and unmagnetized ferromagnetic materials. The diffraction patterns for unmagnetized, polycrystalline samples of Fe and Co are found to possess both nuclear and magnetic components with the latter in agreement with the magnetic scattering theory with respect both to intensity of scattering and form factor angular variation. Studies on the magnetic structure of ${\mathrm{Fe}}_{3}$${\mathrm{O}}_{4}$ are shown to strongly support N\'eel's proposed ferrimagnetic structure. Predictions of the theory regarding intensity effects upon sample magnetization are fully confirmed and the Schwinger-Halpern-Johnson formulation of the interaction function between the neutron's magnetic moment and the internal fields in a ferromagnet is substantiated. A pronounced variation of intensity around the Debye ring in the diffraction pattern for a magnetized sample is found. Neutron polarization effects in the Bragg scattered beams from magnetized crystals of Fe and ${\mathrm{Fe}}_{3}$${\mathrm{O}}_{4}$ have been studied and it is shown that very highly polarized beams are obtained for certain reflections. This method of monochromatic beam polarization is found to compare very favorably with other methods with respect to polarization value, beam intensity, and ease of obtainment.
153 citations