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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 Ga-flux method was used to grow high quality single crystals of NpTGa 5 (T = Fe, Rh, and Ni) with a tetragonal structure and measured their electrical resistivity, specific heat, magnetic susceptibility, and magnetization.
Abstract: We grew high-quality single crystals of NpTGa 5 (T = Fe, Rh, and Ni) with a tetragonal structure by the Ga-flux method and measured their electrical resistivity, specific heat, magnetic susceptibility, and magnetization. All the investigated compounds undergo magnetic ordering. NpFeGa 5 orders antiferromagnetically at T N =118 K and shows another magnetic transition at T * =78 K. A relatively large electrical resistivity indicates that NpFeGa 5 might be a low-carrier compound. NpRhGa 5 also orders antiferromagnetically at T N1 =36 K. Below another magnetic transition at T N2 =32 K, the antiferromagnetic easy-axis is most likely changed from [001] to the (001) plane. On the other hand, NpNiGa 5 undergoes ferromagnetic ordering at T C =30 K, where the magnetic moment of Np is directed along the [001] direction. Furthermore, below another magnetic transition at T * =18 K, the ordered moment is discontinuously enlarged and a change of the magnetic structure occurs. The electronic specific heat coefficients ar...
49 citations
TL;DR: In this paper, the density-functional methods with the generalized gradient approximation for the exchange-correlation energy functional and the on-site Coulomb effect (GGA+U) were employed to explore various cation distributions and magnetic orders of the system.
Abstract: MnFe2O4 generally crystallizes in a mixed phase consisting of both the normal and inverse spinel structures with the fitted experimentally determined saturation moments of 5 and 3 μB per formula, respectively. Employing the density-functional methods with the generalized gradient approximation for the exchange-correlation energy functional and the on-site Coulomb effect (GGA+U), we have studied this material through exploring various cation distributions and magnetic orders of the system. We demonstrate that the magnetic moment can be accounted for by the high-spin Mn2+ cations at the tetrahedral site in the normal spinel structure and by the intermediate-spin Mn2+ cations at the octahedral site in the inverse spinel structure. That is, the results support the single-valence state for this material. The corresponding energetics, exchange interactions, and electronic properties are also presented and discussed.
49 citations
TL;DR: In this article, a combination of a reverse Monte Carlo (RMC) technique and Rietveld analysis was used to show that the low temperature magnetic structures of the perovskite-type complex metal oxides A2FeWO6 (Sr, Ba) are antiferromagnetic based on a unit cell related to that of the nuclear structure by a propagation vector.
49 citations
TL;DR: In this paper, the magnetic anisotropy of the cubic heavy-fermion compounds CeIn3 and CePb3 has been investigated under pressure on cubic heavyfermions and their resistivity measurements were performed to study the magnetic-nonmagnetic transition.
Abstract: Neutron diffraction experiments under pressure on the cubic heavy-fermion compounds CeIn3 and CePb3 are reported. Resistivity measurements were performed on CeIn3 in order to study the approach to the magnetic-nonmagnetic transition. Comparisons are made with previous results obtained on CeAl2. In CePb3 and CeAl2, the pressure-induced change in the magnetic structure from modulated to simple-antiferromagnetic may correspond to a reduction of the magnetic anisotropy. The strong pressure decrease of the Neel temperature of CeIn3 for P>15 kbar indicates the proximity of the transition from a magnetic to a nonmagnetic ground state. In cubic heavy-fermion compounds, the appearance of a nonmagnetic ground state seems to be directly connected to the recovery of the full multiplet degeneracy of the rare-earth ion.
48 citations
TL;DR: Numerical calculations reveal a transition from an exchange-dominated to an anisotropy-dominated regime on increasing the particle height: the smaller particles are in a single-domain collinear state while larger particles exhibit a spin-spiral magnetic structure determined by the magnetic anisOTropy energy.
Abstract: Using photoemission electron microscopy, we study the magnetization orientation in single 5‐25 nm iron particles coupled to a ferromagnetic cobalt support. We find a noncollinear alignment between the particle and substrate magnetization above a particle size of � 6n mand a parallel alignment for smaller sizes. Numerical calculations reveal a transition from an exchange-dominated to an anisotropy-dominated regime on increasing the particle height: the smaller particles are in a single-domain collinear state while larger particles exhibit a spin-spiral magnetic structure determined by the magnetic anisotropy energy.
48 citations