Topic
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: The geometric and magnetic structures of small Pt(n) clusters supported on a graphene layer have been investigated using ab initio density functional calculations including spin-orbit coupling and strong buckling of the graphene layer induced by the Pt-C bonds prevents the formation of a larger number of cluster-support bonds.
Abstract: The geometric and magnetic structures of small Pt n clusters (n = 1 − 5) supported on a graphene layer have been investigated using ab initio density functional calculations including spin-orbit coupling. Pt–Pt interactions were found to be much stronger than the Pt–C interactions promoting the binding to the support. As a consequence, the equilibrium structure of the gas-phase clusters is preserved if they are deposited on graphene. However, the clusters bind to graphene only via at most two Pt–C bonds: A Pt2 dumbbell prefers an upright position, the larger clusters are bound to graphene only via one edge of the planar cluster (Pt3 and Pt5) or via two terminal Pt atoms of a bent Pt4 rhombus. Evidently, the strong buckling of the graphene layer induced by the Pt–C bonds prevents the formation of a larger number of cluster-support bonds. As the local spin and orbital magnetic moments are quenched on the Pt atoms forming Pt–C bonds, the magnetic structure of the supported clusters is much more inhomogeneous as in the gas-phase. This leads to noncollinear magnetic structures and a strongly reduced magnetic anisotropy energy.
63 citations
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TL;DR: In the case of R Fe 6 Al 6 (R = Y, Eu, Gd, Tb, Dy, Ho, Er, Tm and Yb), the magnetization curves start with low values at low temperatures and rise to very high values at T max ~ 230 K and then drop to 0 at T c ~ 330 K as discussed by the authors.
63 citations
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TL;DR: The magnetic structure in Cd2Os2O7 is resolved with neutron diffraction and then via resonant inelastic X-ray scattering determine the salient electronic and magnetic energy scales controlling the MIT.
Abstract: Much consideration has been given to the role of spin-orbit coupling (SOC) in 5d oxides, particularly on the formation of novel electronic states and manifested metal-insulator transitions (MITs). SOC plays a dominant role in 5d5 iridates (Ir4+), undergoing MITs both concurrent (pyrochlores) and separated (perovskites) from the onset of magnetic order. However, the role of SOC for other 5d configurations is less clear. For example, 5d3 (Os5+) systems are expected to have an orbital singlet with reduced effective SOC. The pyrochlore Cd2Os2O7 nonetheless exhibits a MIT entwined with magnetic order phenomenologically similar to pyrochlore iridates. Here, we resolve the magnetic structure in Cd2Os2O7 with neutron diffraction and then via resonant inelastic X-ray scattering determine the salient electronic and magnetic energy scales controlling the MIT. In particular, SOC plays a subtle role in creating the electronic ground state but drives the magnetic order and emergence of a multiple spin-flip magnetic excitation.
62 citations
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TL;DR: The antiferromagnetic structure of MnO was studied using high-resolution neutron diffraction from a polycrystalline sample at 8 K and the ''allowed-reflection rule'' which is obeyed by the observed reflections was deduced.
Abstract: The antiferromagnetic structure of MnO was studied using high-resolution neutron diffraction from a polycrystalline sample at 8 K. The ''allowed-reflection rule'' which is obeyed by the observed reflections was deduced. By use of this rule, and without recourse to calculation of intensities, it is shown unambiguously that the magnetic structure is collinear, and the magnetic configuration is deduced. By using the (115)-to-(333) magnetic intensity ratio (whose splitting is observable only with high resolution), we found that within our experimental resolution, the spin axis is perpendicular to the unique (111) direction.
62 citations
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TL;DR: In this paper, the authors report on hybrid epitaxy of freestanding vapor-liquid-solid grown and in-plane selective area grown semiconductor-ferromagnetic insulator-superconductor (InAs/EuS/Al) nanowire heterostructures.
Abstract: Nanowires can serve as flexible substrates for hybrid epitaxial growth on selected facets, allowing for the design of heterostructures with complex material combinations and geometries. In this work we report on hybrid epitaxy of freestanding vapor-liquid-solid grown and in-plane selective area grown semiconductor-ferromagnetic insulator-superconductor (InAs/EuS/Al) nanowire heterostructures. We study the crystal growth and complex epitaxial matching of wurtzite and zinc-blende InAs/rock-salt EuS interfaces as well as rock-salt EuS/face-centered cubic Al interfaces. Because of the magnetic anisotropy originating from the nanowire shape, the magnetic structure of the EuS phase is easily tuned into single magnetic domains. This effect efficiently ejects the stray field lines along the nanowires. With tunnel spectroscopy measurements of the density of states, we show that the material has a hard induced superconducting gap, and magnetic hysteretic evolution which indicates that the magnetic exchange fields are not negligible. These hybrid nanowires fulfill key material requirements for serving as a platform for spin-based quantum applications, such as scalable topological quantum computing.
62 citations