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Hematite (α-Fe2O3), the stable oxide of iron, is a major constituent of soils, rocks and the earth's crust. It has unique magnetic properties that make it the prototype for the class of materials known as canted antiferromagnets.This book has no equivalent. The mean-field theory is treated in detail, and thus the book is a useful text for students mastering this general method. Information obtained by a wide variety of experimental methods is provided. These techniques include x-ray and neutron diffraction; electron magnetic resonance; Mössbauer spectroscopy; and thermal, optical, electrical and elastic measurements.
It is known from neutron scattering experiments that alpha-CoSO4 is a four-sublattice canted antiferromagnet with no net magnetic moment. In this paper the magnetic properties of this material are analyzed using a model in which an isotropic fictitious spin of 1/2 is assigned to each Co(++) ion. The large canting angle of 25 degrees is interpreted in terms of antisymmetric terms in the Hamiltonian due to anisotropic superexchange and the large anisotropy in the g values. Corresponding to the four sublattices, there are four spin-wave modes at k=0. Calculations indicate that the resonant frequencies of these modes should lie in the far infrared, and that only three of the modes should be observable spectroscopically. In addition, static susceptibilities of the system have been calculated for T=0 and T”Tn(12K), and the g values were estimated. Far-infrared transmission experiments resulted in the observation of three lines at 20.6, 25.4 and 35.8 cm, with relative intensities 1:1:0.1. Although these lines are presumed to be the three expected resonances, an unambiguous fitting for all the parameters of the model has not been possible. The temperature dependence of the resonance lines is anomalous. (Author).
"Volume 20 of the Handbook of Magnetic Materials, as the preceding volumes, has a dual purpose. As a textbook it is intended to help those who wish to be introduced to a given topic in the field of magnetism without the need to read the vast amount of literature published. As a work of reference it is intended for scientists active in magnetism research. To this dual purpose, Volume 20 is composed of topical review articles written by leading authorities. In each of these articles an extensive description is given in graphical as well as in tabular form, much emphasis being placed on the discussion of the experimental material in the framework of physics, chemistry and material science. It provides readers with novel trends and achievements in magnetism"--Publisher's note.
Magnetic properties of the antiferromagnet RbMnF3 were studied. Below T sub N, the magnetic ions order into a two-sublattice system with the spins antiparallel. RbMnF3 exhibits high exchange and low anisotropy; the form of the anisotropy surface is cubic. Consequently, for applied DC magnetic fields less than about 3000 oe, the static equilibrium position of the sublattice magnetization is, in general, multivalued. Measurements of the DC susceptibility chi were made on powder and single crystal specimens of RbMnF3 for the range of applied field 0 to 12 koe and over the temperature range 4.2 to 300K. The observed value of T sub N was about ten degrees higher than the previously published value. When plotted as a function of applied field, chi sub(111) shows no abrupt discontinuity analogous to the spin flopping exhibited by uniaxial antiferromagnets. A simple model, in which H sub DC and M are restricted to the (110) plane, has enabled solutions of the static equilibrium problem to be obtained. X-band resonance experiments are reported, and a resonance theory is presented which incorporates the equilibrium solutions. The predicted antiferromagnetic resonance spectrum shows reasonable agreement with the experimental data. (Author).
Magnetic Materials is an excellent introduction to the basics of magnetism, magnetic materials and their applications in modern device technologies. Retaining the concise style of the original, this edition has been thoroughly revised to address significant developments in the field, including the improved understanding of basic magnetic phenomena, new classes of materials, and changes to device paradigms. With homework problems, solutions to selected problems and a detailed list of references, Magnetic Materials continues to be the ideal book for a one-semester course and as a self-study guide for researchers new to the field. New to this edition: • Entirely new chapters on Exchange Bias Coupling, Multiferroic and Magnetoelectric Materials, Magnetic Insulators • Revised throughout, with substantial updates to the chapters on Magnetic Recording and Magnetic Semiconductors, incorporating the latest advances in the field • New example problems with worked solutions