Journal ArticleDOI
Stress induced magnetic anisotropy in natural single crystals of hematite
TLDR
In this article, stress induced anisotropy has been determined for several natural crystals of hematite for compressions of up to 300 Kg/cm2 along the trigonal axis and along different directions within the basal plane.Abstract:
The stress induced anisotropy has been determined for several natural crystals of hematite for compressions of up to 300 Kg/cm2 along the trigonal axis and along different directions within the basal plane. The induced anisotropy is predominantly uniaxial, but substantial higher harmonics are present for compressions along the trigonal axis. It is larger for compressions within the basal plane in accordance with the magnetostriction experiments of Urquhart and Goldman. Stress induced anisotropy as a possible explanation of the high coercive forces of hematite powders is discussed, as shape and intrinsic crystalline anisotropy are negligible.read more
Citations
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Magnetic anisotropy in rocks
TL;DR: In any rock six kinds of magnetic anisotropy can be distinguished, viz. shape alignment of grains, alignment of magnetic domains, stringing-together of magnetic grains, which is a special case of (1), (5) stress-induced anisotropic, and (6) exchange anisiotropy.
Journal ArticleDOI
Magnetic Mineralogy of Unheated and Heated Red Sediments by Coercivity Spectrum Analysis
TL;DR: In this paper, a method of deriving the remanent coercivity spectrum from the isothermal remanence vs. applied field characteristic is described and applied to a series of Triassic sandstones and late Cretaceous-early Tertiary clays and limestones from France.
Journal ArticleDOI
Quantitative Study on Current-Induced Effect in an Antiferromagnet Insulator/Pt Bilayer Film.
TL;DR: It is found that the current-induced magnetoresistance change in antiferromagnets can be complicated by resistive switching that does not have a magnetic origin.
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Magnetic properties of natural goethite. I: Grain-size dependence of some low- and high-field related rockmagnetic parameters measured at room temperature
TL;DR: In this paper, five goethite concentrates, separated from natural samples of different supergene geological origin, are sieved in 12 well-defined grain-size fractions ranging from 250 pm down to <5 pm.
Journal ArticleDOI
A critical review of the heavy elastica
TL;DR: The heavy elastica model as mentioned in this paper models thin or slender elements with non-negligible density, and the non-linear governing equation depends on a non-dimensional parameter representing the relative importance of density and length to rigidity.
References
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Journal ArticleDOI
A Mechanism of Magnetic Hysteresis in Heterogeneous Alloys
Edmund C. Stoner,E. P. Wohlfarth +1 more
TL;DR: In this paper, the effect of shape anisotropy on magnetization curves was studied for the case of ellipsoidal spheroids of revolution (e.g., ellipses of revolution).
Journal ArticleDOI
The physical theory of rock magnetism
TL;DR: Magnetite and hematite are representative of the ferrimagnetic and weakly ferromagnetic minerals which are responsible for the magnetic properties of rocks reviewed in this paper, including coercivity, susceptibility, magnetic viscosity, thermo- and isothermal remanence, alternating field demagnetization, anhysteretic, chemical and detrital magnetization.
Journal ArticleDOI
Magnetic Properties of Synthetic Single Crystal of αFe 2 O 3
Akira Tasaki,Shūichi Iida +1 more
TL;DR: In this article, it was found that the residual magnetic moment appears only when the spins lie in the (111) plane, while in the case of polycrystallines, recovery of the residual magnetization or the memory phenomenon is not observed.
Journal ArticleDOI
Observations on the magnetic transition in hematite at -15°C
TL;DR: In this paper, the magnetic properties of hematite are attributed to two magnetically independent components of ferromagnetism, one dependent upon the antiferromagnetic transition whilst the other is independent of this transition.