COMPUTATION OF EXCHANGE INTEGRAL AND QUANTITATIVE INDICATION OF FERROMAGNETISM
Xu Jiazhen, Xu Shufa*, Liu Yueming** Chongqing Jianzhu University, P. R. China *Workers & Stuff University of Chongqing Municipal Bureau of Machine Building **Shenzhen Lingke Limited Company of Telecommunication
Keywords: exchange integral, magnetic testing, magnetization standard, ferromagnetism, computation
ABSTRACT
This paper presents selection, revision and adjustment of theory model, potential field, wave function and Hamilton operator of exchange interaction, and computation of exchange integral of element Gd number 64, and gives result of the computation. That the computation result is agreement with experiment result proves that it is correct to use exchange integral as criterion of ferromagnetism. The paper advances to use exchange integral J as parameter of quantitative indication of strength of ferromagnetism. And authors advance a tentative idea to use exchange integral as parameter of selection of magnetization standard in magnetic testing.
Publication Source: Trends in NDE Science & Technology; Proceedings of the 14th World Conference on Non-Destructive Testing, New Delhi, 8-13 December 1996.Vol. 3, pages 1585 - 1588 Publisher:Ashgate Publishing Company
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