Download Amorphous Magnetism: Proceedings of the International by P. W. Anderson (auth.), Henry O. Hooper, Adriann M. de Graaf PDF

By P. W. Anderson (auth.), Henry O. Hooper, Adriann M. de Graaf (eds.)

The name of amorphous magnetism was once conceived to en­ compass the examine of the magnetic houses of dilute ran­ dom substitutional alloys, amorphous metal alloys, amor­ phous magnetic semiconductors and the traditional glasses, together with cha1cogenide, natural and inorganic glasses. those fabrics have heretofore been thought of to be fairly diversified due to the adjustments of their atomic struc­ tures. notwithstanding, whilst the magnetic habit of those mater­ ials is punctiliously tested it turns into transparent that those fabrics show definite similarities. For the 1st time on the overseas Symposium on Amorphous Magnetism held at Wayne country collage in Detroit, Michigan on August 17 and 18, 1972, scientists operating in those components have been assembled to envision the similarities of those structures. This quantity includes a precis of the nine invited talks, 23 introduced, 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 set 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 modifying our transcriptions from tape recordings of the discussions which their displays. moreover, we want to thank the members at this convention whose enthusiasm and curiosity made the convention so successful.

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Additional info for Amorphous Magnetism: Proceedings of the International Symposium on Amorphous Magnetism, August 17–18, 1972, Detroit, Michigan

Sample text

For open magnetic amorphous structures where the magnetic atoms may be regarded as still lying on two interpenetrating antiparallel sublattices, as treated by Kobe and Handrich (11) and Hasegawa (12), the molecular field model predicts a small increase in the Neel temperature when a material becomes amorphous, and for effectively close packed structures as treated by Simpson (10), a reduction by at most 30%. 31 AMORPHOUS ANTI FERROMAGNETISM IN P2 0 S GLASSES The low temperature reciprocal susceptibility-temperature data for the cobalt glass is roughly as predicted by the molecular field treatment \10,4) with the downwards curvature arising as a consequence of a proportion of isolated paramagnetic atoms.

Wedgwood Atomic Energy Research Establishment, Harwell ABSTRACT Phosphorus pentoxide glasses containing high concentrations of Mn 2 +, Fe 3 +, Ni 2 +, Co2 + and Cu 2 + have been prepared and measurements made of their magnetic susceptibility and low temperature speCific heat. Also neutron diffraction measurements were made on two of the samples. All the materials measured showed antiferromagnetic interactions but only one of the families of glasses, those containing Fe 3 +, showed evidence of an antiferromagnetic tranSition (Nee I temperature).

As more iron is added up to Z5 wt% FeZ03 the fraction of four-coordinated borons remains constant. 65 mole%) of Fez03 are added to the glass does the iron possibly act as a modifier, and for amounts of iron exceeding a fraction of a mole percent the iron goes into the network, most likely bonding to four oxygert atoms. An examination of the EPR and Mossbauer data produces a conclusion which is consistent with that drawn from the llB NMR results as to site of the Fe 3+ ions in these borate base glasses.

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