Non-relativistic ferromagnetotriakontadipolar order and spin …

Abstract. We show that hematite, α 𝛼 alpha italic_α-Fe 2 O 3, below its Morin transition, has a ferroic ordering of rank-5 magnetic triakontadipoles on the Fe ions.In the absence of spin-orbit coupling, these are the lowest-order ferroically aligned magnetic multipoles, and they give rise to the g 𝑔 g italic_g-wave non-relativistic spin splitting in …

Mineral and Technological Features of …

The magnetite–hematite ores of the Mikhailovskoye deposit are characterized by fine dissemination of ore and gangue minerals, the complexity of the structural and textural features and material …

Hematite: A primary ore of iron and a pigment …

Hematite's Streak: All specimens of hematite will produce a reddish streak. The streak of a mineral is its color in powdered form when scraped across a streak plate (a small piece of unglazed porcelain used to produce a …

Hematite: Mineral information, data and localities.

Hematite Group.The iron analogue of Corundum, Eskolaite, and Karelianite. Hematite is rather variable in its appearance - it can be in reddish brown, ocherous masses, dark silvery-grey scaled masses, silvery-grey to black crystals, and dark-grey masses, to …

Exceptional sign changes of the nonlocal spin Seebeck effect …

Figure 2 (a) Geometry used to investigate the nonlocal spin Seebeck effect (NL-SSE) in hematite (blue). A passing charge current heats the hematite below one Pt wire, generating a thermal gradient ∇ T.The easy-axis is inclined at 33 ∘ to the surface plane and a magnetic field H is applied parallel in the in-plane component of the Néel vector. …

Nanostructured hematite thin films produced by spin …

DOI: 10.1016/J.SOLMAT.2008.11.049 Corpus ID: 97549967; Nanostructured hematite thin films produced by spin-coating deposition solution : Application in water splitting @article{Souza2009NanostructuredHT, title={Nanostructured hematite thin films produced by spin-coating deposition solution : Application in water splitting}, …

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Room-Temperature Antiferromagnetic Resonance and Inverse Spin …

We study theoretically and experimentally the spin pumping signals induced by the resonance of canted antiferromagnets with Dzyaloshinskii-Moriya interaction and demonstrate that they can generate easily observable inverse spin-Hall voltages. Using a bilayer of hematite/heavy metal as a model system, we measure at room temperature …

Unexpected Magnetic Behavior of Natural Hematite…

1 Introduction. Hematite (α-Fe 2 O 3) is the most stable and widespread iron oxide mineral in nature.Hematite has a corundum crystal structure with alternating iron and oxygen layers stacked along the crystallographic c-axis of the hexagonal unit cell.At low temperatures, Fe 3+ spins order antiferromagnetically (Shull et al., 1951), so that …

Terahertz Spin Current Dynamics in Antiferromagnetic Hematite

Hematite (α-Fe 2 O 3) is a promising model material in this respect because its pronounced Dzyaloshinskii-Moriya interaction leads to the coexistence of antiferromagnetism and weak ferromagnetism. Here, femtosecond laser pulses are used to drive terahertz (THz) spin currents from α-Fe 2 O 3 into an adjacent Pt layer. Two …

Hematite | Common Minerals

Goethite is a hydrous (water-bearing) iron oxide that forms as a direct precipitate in marine water and bogs, and as an alteration of other iron-bearing minerals. Along with hematite, goethite is the other mineral that …

[2301.13094] Magnetic properties of hematite revealed by …

Hematite is a canted antiferromagnetic insulator, promising for applications in spintronics. Here, we present ab initio calculations of the tensorial exchange interactions of hematite and use them to understand its magnetic properties by parameterizing a semiclassical Heisenberg spin model. Using atomistic spin dynamics simulations, we …

Unexpected Magnetic Behavior of Natural Hematite-Bearing Rocks at Low Temperatures

Spin orientation in solid solution hematite-ilmenite

The spin orientation in synthetic hematite-ilmenite samples and in a sample of natural hematite was studied from room temperature to above the antiferromagnetic-paramagnetic phase transition (the Néel temperature; T N ≈ 600–950 K) by neutron powder diffraction and at room temperature by Möss spectroscopy. The usually assumed …

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Facet-specific reactivity of hematite nanocrystals during Fe(II

Hematite recrystallization caused suppression on Morin transition and increase in crystallinity for both HNCs and HNPs, with the extent depending on surface …

Analysis of the Fe 2p XPS for hematite

The origins of the complex Fe 2p X-Ray Photoelectron Spectra (XPS) of hematite (α-Fe 2 O 3) are analyzed and related to the character of the bonding in this compound.This analysis provides a new and novel view of the reasons for XPS binding energies (BEs) and BE shifts, which deepens the current understanding and …

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(PDF) Magnetic anisotropy and quantized spin waves in hematite …

The hematite in Sinus Meridiani is thus distinct from the fine-grained (diameter <5-10 μm), red, crystalline hematite considered, on the basis of visible, near-IR data, to be a minor spectral ...

Spin wave dispersion of ultra-low damping hematite

Low magnetic damping and high group velocity of spin waves (SWs) or magnons are two crucial parameters for functional magnonic devices. Magnonics research on signal processing and wave-based computation at GHz frequencies focused on the artificial ferrimagnetic garnet Y 3 Fe 5 O 12 (YIG) so far. We report on spin wave …

Long-distance spin-transport across the Morin phase …

In this article, we report long-distance spin-transport in the easy-plane canted antiferromagnetic phase of hematite and at room temperature, where the linearly …

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Air-dry as you spin-dry Nobles industrial dryers spin off excess water, paints and oils. They're ideal for drying small parts in plating and finishing operations. Efficient Centrifugal force throws moisture off the parts, through a mesh basket to a drain. At the same time, a turbine fan mounted below the basket creates a powerful suction ...

Mechanical properties of magnetite (Fe3O4), hematite (α …

Hardness and elastic properties of pure (crystal) and complex (product of corrosion) iron oxides, magnetite (Fe 3 O 4), hematite (α-Fe 2 O 3) and goethite (α …

Mechanical properties of siderite and hematite from DFT …

After convergence tests, a k-point set of 6 × 6 × 2 and cutoff energy of 480 eV were chosen as calculating parameters of siderite, and those for hematite were determined as 6 × 6 × 2 and 500 eV. With respect to the magnetism of hematite, the initial spin-polarization states were considered in the calculation process.

First-principles calculations of hematite (α-Fe2O3) by self …

Hematite is a small-band-gap semiconductor (1.9–2.6 eV) 4, 5, 6 with a rhombohedral crystal system and R 3 ¯ c space group. Two formula units are contained …

Terahertz Spin Current Dynamics in Antiferromagnetic Hematite

The total THz spin current dynamics can be manipulated by a medium‐strength magnetic field below 1 T. The control of the THz spin current achieved in α‐Fe2O3 opens the pathway toward tailoring the exact spin current dynamics from ultrafast AFM spin sources. ... Hematite (α‐Fe2O3) is a promising model material in this respect …

Spin Orientation of Hematite $(alpha hbox …

Spin Orientation of Hematite $(alpha hbox-hboxFe_2hboxO_3)$ Nanoparticles During the Morin Transition ... The produced sample was dried at 80ºC for 6 hours in a drier oven and had a fairly ...

Nanostructured hematite thin films produced by spin …

The hematite solution was dried and burned out under similar conditions at 500 °C for 2 h (in an electrical furnace).2.2. Structural and morphological characterizationThe morphology of Si-doped and undoped hematite films was characterized by high-resolution field emission scanning electron microscopy (FE-SEM, …