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 learn of the magnetic houses of dilute ran­ dom substitutional alloys, amorphous steel 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 diverse as a result changes of their atomic struc­ tures. despite the fact that, while the magnetic habit of those mater­ ials is punctiliously tested it turns into transparent that those fabrics express convinced similarities. For the 1st time on the foreign Symposium on Amorphous Magnetism held at Wayne kingdom collage 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 encompasses 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 application. This quantity offers for the 1st time a set of the most up-tp-date theoretical and experimental experiences within the zone of amorphous magnetism. we want to thank the authors of those papers for his or her striking cooperation in getting ready their manuscripts and for modifying our transcriptions from tape recordings of the discussions which their shows. furthermore, we want to thank the contributors at this convention whose enthusiasm and curiosity made the convention so successful.

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

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K. Wilson et al have also reported a similar 1-1 Y. z 0-4 0-1 ,, , ,, , ,, , ~ , , , ,, ,, , ,, 60 ,, , 100 140 180 220 260 TEMPERATURE K 300 Figure 2 The temperature variation of the reciprocal sUBceptipiLity for a manganese glass. K. Wilson, these Proceedings). For this glass the paramagnetic N~el temperature (-26 0 K) is just twice that for the crystalline material ~-13DK) which has a higher concentration of manganese ions, This implies an increase in the superexchange interaction between the manganese ions by roughly two times.

When Na20 is added to pure B203, where only planar B03 units exist, two boron atoms become fourcoordinated. The sodium is called a modifier and exists in the glass as a Na+ ion p'resumably near a B04- tetrahedron to maintain charge neutrality. 65 mole %) Fez03 has been added. 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.

C. susceptibility (A) vs. temperature and l/X (0) vs. 5 18 >< 12::;- E 9 ~ E 2' 6~ 3 20 Figure 3. c. susceptibility (~) vs. temperature and l/X (0) vs. temperature for a sodium borate glass containing 35 wt% Fe203. MAGNETIC ORDER IN ALKALI BORATE AND ALUMINOSILICATE GLASSES I A_ Figure 4. c. susceptibility vs. temperature for sodium borate samples containing (a) 35 wt% Fe203 (A); (b) 30 wt% Fe203 (0); (c) same 30 wt% Fe203 sample in an applied field of 2kOe (0). ceptibility as the temperature is lowered at about l13°K.

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