Magnetocrystalline Anisotropy of Pure and Doped Hematite

Besser, P. J.; Morrish, A. H.; Searle, C. W.

doi:10.1103/physrev.153.632

Cited by 174 publications

(105 citation statements)

References 16 publications

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“…A tiny amount of titanium will suppress the Morin transition (Besser et al, 1967) so that hematite with moderate titanium substitution is a canted antiferromagnet at all temperatures. A (see Fig.…”

Section: -52 Ilmenite 4-37mentioning

confidence: 99%

Magnetic Properties of Iron in Soil Iron Oxides and Clay Minerals

Coey

1988

Iron in Soils and Clay Minerals

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Section: -52 Ilmenite 4-37mentioning

confidence: 99%

Magnetic Properties of Iron in Soil Iron Oxides and Clay Minerals

Coey

1988

Iron in Soils and Clay Minerals

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“…At low temperatures, Fe 3+ spins of pure bulk hematite are antiferromagnetically oriented along the c-axis of the hexagonal corundum cell [space group D 3d 6 (R3 c)] [64]; a spin-flip transition occurs at the Morin temperature T M ffi 260 K [63]; above T M hematite becomes a canted antiferromagnet with Fe 3+ spins now lying in the basal plane of the hexagonal cell. The Morin temperature marks the onset of spincanted (or weak) ferromagnetism resulting from incomplete balance of canted spins.…”

Section: Hematite and Doped Hematite Npsmentioning

confidence: 99%

Magnetite and Other Fe-Oxide Nanoparticles

Chiolerio

Chiodoni

Allia

et al. 2014

Handbook of Nanomaterials Properties

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“…A growing single-ion contribution of opposite sign may account for the low temperature behaviour. This is reminiscent of the competing anisotropy model for a-Fe203 (Besser et al, 1967), although in the case of haematite, it refers to the c-axis anisotropy. The particle size dependence of HH as indicated by the parameter n (-0.3, Table 2) is weaker in these annealed synthetic materials than in the ore samples studied by Clark (1984) which yield n -0.8.…”

Section: The Low Temperature He Datamentioning

confidence: 99%

Magnetic Hysteresis Properties of Fine Particles of Monoclinic Pyrrhotite Fe7S8.

Menyeh

O’Reilly

1997

J. geomagn. geoelec

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The magnetic hysteresis properties have been studied of synthetic Fe7S8 separated into a suite of 8 particle size fractions in the range 1 to 30µm. Between-196°C to about 260°C, both saturation isothermal remanence (Mrs) and coercive force (Hc) can be represented as analytical functions of particle size (L) of the form (Mrs, Hc) « L-n or (Mrs, Hc) oc exp(-kLI"2) although the particle size dependence of Mrs is much weaker than that of Hc. The parameters n and k show a small but systematic fall in values as temperature rises, but may be acceptably constant to furnish analytic functions for physical models of more complex magnetic properties such as thermoremanent magnetization or domain dynamics. The temperature dependence of He below room temperature is weaker than that above, possibly due to an increasing single-ion contribution to magnetocrystalline anisotropy. The inferred temperature dependence of magnetocrystalline anisotropy above room temperature up to about 250°C suggests that temperatureinduced expulsion or nucleation of domain walls is not expected in this temperature range. The temperature dependence of Mrs and He can be expressed as (1 -TITT)q where q shows a small but systematic fall as particle size increases in the range 1-30µm. The several properties of the finest, monodomain, fraction (<1 µm) seem best explained if a grain size an order of magnitude smaller than that observed electron optically is assigned to the particles. This may indicate the presence of "nanocrystals" within the envelope of the particles.

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Magnetocrystalline Anisotropy of Pure and Doped Hematite

Cited by 174 publications

References 16 publications

Magnetic Properties of Iron in Soil Iron Oxides and Clay Minerals

Magnetic Properties of Iron in Soil Iron Oxides and Clay Minerals

Magnetite and Other Fe-Oxide Nanoparticles

Magnetic Hysteresis Properties of Fine Particles of Monoclinic Pyrrhotite Fe7S8.

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