Magnetism

Amorphous Magnetism II by P. W. Anderson (auth.), R. A. Levy, R. Hasegawa (eds.)

By P. W. Anderson (auth.), R. A. Levy, R. Hasegawa (eds.)

The papers making up this quantity characterize a precis of the lawsuits of the second one overseas Symposium on Amorphous Magnetism held at Rensselaer Polytechnic Institute on August 25- 27, 1976. because of the resounding good fortune of the Inter­ nationwide Symposium on Amorphous Magnetism held at Wayne country college on August 17 and 18, 1972 this symposium was once back geared up with the aim in brain of supplying a discussion board for dis­ cussion of the newest theoretical and experimental advances made within the fields of spin glass structures, amorphous magnetic alloys and magnetic oxide glasses. The symposium used to be backed through the yank actual Society and supported by means of a supply from GTE Laboratories. extra help cash have been supplied via common electrical, Allied Chemical and Ford Motor corporation. this system committee consisted of J. J. Becker (General Electric), P. A. Casabella (RPI), P. J. Cote (Watervliet Arsenal), A. M. de Graaf (Wayne kingdom University), R. Hasegawa, Co-Chairman (Allied Chemical), H. O. Hooper (University of Maine), H. B. Huntington (RPI), R. A. Levy, Chairman (RPI), R. ok. MacCrone (RPI), L. N. Mulay (Penn country University), G. L. Salinger (RPI) and J. Wong (General Electric). this system of the symposium incorporated 7 invited evaluate papers, fifty three contributed papers, and 10 extra papers learn by means of identify due to time obstacles. The editors desire to expand their deep appreciation to J. J. Becker, A. M. de Graaf, P. Duwez, J. Gustafson, D. L. Huber, U.

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K. H. Fischer, Phys. Rev. Lett~, 1438 (1975); Solid State Comm. 18, 1515 (1976). 3. 4. D. Sherrington and S. Kirkpatrick, Phys. Rev. Lett. 32, 1792 (1975). D. L. Huber and W. Y. Ching, AlP Conf. Proc. (to be published) . 5. K. Binder and K. Schroder, Solid State Comm. 18, 1361 (1976). K. Binder and D. Stauffer, Phys. Lett A 21, 177 (1976). 6. P. W. Anderson, Amor8hous Magnetism, ed. by H. O. Hooper and A. M. deraa£ (New York, Plenum, 1973), p. 1. 7. N. Rivier, Wiss. Z. Techn, Universe Dresden 1000 (1974).

9 (S) at. 03 (3) o. 18 -0. 2 at. 28 at. % Fe. 8(2) for ",t, .... 1 ... 015 AT. 0 .... 4Fe) Fig. 2. 015 at. 28 at. 015 at. 28 at. % Fe, both of which are estimated from the susceptibil ity data. 3 J: c ~ CDeI) ....... 1< d5

Of course , also the accuracy of these Monte Carlo simulations /21/ is limited. Thus at present it is not clear whether the phase transition behavior of spin glasses is correctly approximated by a model /5/ of well-defined non-interacting clusters. ,0 25 THEORIES OF SPIN GLASS V. CONCLUSION This paper explored some possibilities of applying percolation theory to amorphous magnets (dilute ferromagnets and spin glasses), and its main result are the boxed-in equations in the text: i) With short range forces, a plausible result was found for the Curie temperature, Eq(9), whereas for the antiferromagnetic Neel temperature of Eq(llb), we suggest further experiments closer to Pc to find out whether the theory is correct.

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