By P. W. Anderson (auth.), Henry O. Hooper, Adriann M. de Graaf (eds.)
The name of amorphous magnetism used to be conceived to en compass the examine of the magnetic houses of dilute ran dom substitutional alloys, amorphous steel alloys, amor phous magnetic semiconductors and the normal glasses, together with cha1cogenide, natural and inorganic glasses. those fabrics have heretofore been thought of to be rather diverse as a result of the modifications of their atomic struc tures. although, whilst the magnetic habit of those mater ials is punctiliously tested it turns into transparent that those fabrics show yes similarities. For the 1st time on the overseas Symposium on Amorphous Magnetism held at Wayne country college in Detroit, Michigan on August 17 and 18, 1972, scientists operating in those parts have been assembled to ascertain the similarities of those platforms. This quantity features a precis of the nine invited talks, 23 added, contributed papers and an extra 12 contri buted papers whcih weren't awarded due to insuffic ient time within the software. This quantity provides for the 1st time a suite of the most up-tp-date theoretical and experimental reports within the sector of amorphous magnetism. we want to thank the authors of those papers for his or her remarkable cooperation in getting ready their manuscripts and for enhancing our transcriptions from tape recordings of the discussions which their shows. additionally, we want to thank the contributors at this convention whose enthusiasm and curiosity made the convention so successful.
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Additional resources for Amorphous Magnetism: Proceedings of the International Symposium on Amorphous Magnetism, August 17–18, 1972, Detroit, Michigan
5 or 2. In truly amorphous solids, not only the number of interacting neighbours but also the exchange constant varies randomly, therefore the problem is far more complicated. However, in our glasses the magnetic interactions arise as a consequence of superexchange via the oxygen atoms and consequently are short range. Therefore it seems reasonable to apply the percolation theory with little modification, since the number of interacting neighbours can be unambiguous ly determined, unlike the case for metals where the interactions are long range.
Here are a number of examples where the same philosophy has been developed in one formalism or another: Yonezawa I3 and Leath I4 provide a diagrammatic basis for the self-consistent method (CPA) as applied to the quantum mechanics of random alloys. Landauer,IS in 1952, analyzed the random mixture of different materials, pression which is simply Eq. 10 above, cr substituted for E. Comparisons were conductivity of a and derived an exwith conductivities made with experiment. 22 J. A. KRUMHANSL The thermal properties of random composites have received considerable theoretical and experimental attention.
The insert shows the low temperature region of the cobalt glass. ) 30 EGAMI, SACLI, SIMPSON, TERRY, AND WEDGWOOD orthophosphate, ~CoO) . PO; a crystalline material with the closest chemical formRla to that of glass, prepared by heating the hydrated orthophosphate (CoO)3. P 205. 8H 20 to 800 0 C for one hour. It is seen that whereas the crystalline orthophosphate shows a reciprocal susceptibility-temperature behaviour characteristic of a normal antiferromagnet with a Neel temperature at 31. 5~, the cobalt glass shows no evidence for any critical temperature down to 1.