Download Handbook of Magnetic Materials, Volume Volume 1 by E.P. Wohlfarth PDF

By E.P. Wohlfarth

The guide of Magnetic fabrics has a twin function; as a textbook, it offers an advent to a given subject inside of magnetism, and as a piece of reference, it serves scientists energetic in magnetism learn. to meet those ambitions, every one bankruptcy within the instruction manual is written by way of major gurus within the box, and combines state of the art learn effects with an intensive compilation of archival wisdom. Magnetism is a quickly increasing box which consistently keeps to surround new phenomena. Examples of such subfields of magnetism are quadrupolar interactions, magnetic superconductors, and quasiscrystals: issues which are all coated within the current quantity. the single universal flooring among those new fabrics and ferromagnets, is the ownership of a magnetic second; the sequence name has been a bit adjusted to mirror this. yet in accordance with culture, the instruction manual of Magnetic fabrics maintains to permit readers to acquaint themselves in nice intensity with subject matters in the course of the whole breadth of magnetism examine.

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Since this calculated entropy is based on a single particle itinerant model Jones et al. (1974) conclude that this is a good model at these high temperatures. P. WOHLFARTH Korenman et al. 5. For iron Grimvall (1975, 1976), however, concludes that the thermodynamic data require persistent disordered localized magnetic moments in the paramagnetic phases. This conclusion in turn was criticized by Sakoh and Shimizu (1977) who concluded that there was no need to invoke entropy contributions from localized moments in the high temperature regimes; Grimvall's conclusion was claimed to arise due to insufficient account having been taken of the peaks in the density of states curve for this metal (see fig.

The room temperature values are given in table 11 and the temperature variation of all five coefficients in fig. 14. The agreement between the data of table 11 is within the experimental uncertainty. Both Lee and Asgar and Bower state categorically that the temperature dependence of the hi coefficients can not be explained on the basis of Callen and Callen's localized model. For cobalt several notations for the magnetostriction coefficients exist (du Tr6molet de Lacheisserie 1970) and one proposed by Bozorth (1954) is used here since the measurements of Hubert et al.

There is also a report of D for fcc Co(+8% Fe), namely 371 meV/~2 using the triple axis spectrometer. For nickel there are several and differing values of D which have b e e n analyzed carefully by Aldred (1975) who gives the room temperature value deduced from the triple axis data of Minkiewicz et al. (1969) and Mook et al. (1973) and shown in table 5 as the most reliable. Mook et al. also measured the temperature dependence of the spin wave dispersion through the Curie temperature. As for iron (Lynn 1975) there are two interesting results.

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