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

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

The identify of amorphous magnetism used to be conceived to en­ compass the learn of the magnetic homes 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 really assorted end result of the transformations of their atomic struc­ tures. in spite of the fact that, whilst the magnetic habit of those mater­ ials is punctiliously tested it turns into transparent that those fabrics express sure similarities. For the 1st time on the foreign Symposium on Amorphous Magnetism held at Wayne nation 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 brought, contributed papers and an extra 12 contri­ buted papers whcih weren't awarded as a result of insuffic­ ient time within the software. This quantity offers for the 1st time a set of the most up-tp-date theoretical and experimental stories within the region of amorphous magnetism. we want to thank the authors of those papers for his or her extraordinary cooperation in getting ready their manuscripts and for modifying our transcriptions from tape recordings of the discussions which their displays. additionally, we want to thank the contributors 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

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Various magnetic behavior; paramagnetic, superparamagnetic, and antiferromagnetic; are exhibited by these glasses, depending on glass composition and the glass preparation procedure. t Research Supported in part by the Air Force Office of Scientific Research under grant AFOSR-72-2002. C. **Present Address, Department of Physics, Loyola University Chicago, Illinois. ***Present Address, Department of Physics, Rhode Island College, Providence, Rhode Island. 47 48 H. O. HOOPER ET AL. In somE glasses there is definite evidence of the presence of small particles of crystalline iron oxide which are responsible, in part, for the magnetic behavior of these samples.

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.

DISCUSSION The experimental results indicate that the glasses may be divided into two groups; the iron glasses in one group and the rest in the other. The iron glasses have paramagnetic Neel temperatures independent of the magnetic ion concentration, neutron diffraction evidence for a magnetic transition, a T2 term in their low temperature specific heat, and clear magnetic evidence for a Neel temperature for at least one glass. (A N~el temperature may be inferred for the other glasses from the specific heat data).

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