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arXiv:1209.3952 · Journal of Magnetism and Magnetic Materials

Effects of the randomly distributed magnetic field on the phase diagrams of the transverse Ising thin film

Ümit Akıncı

Published Oct 30, 2012• 38 citations
arXivHTMLPDF
DOI
10.1016/j.jmmm.2012.10.034

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Abstract The phase diagram of a transverse Ising thin film is investigated by the use of two theoretical frameworks, namely the standard mean field theory and the effective field theory. The effects of the ratio p between the bulk and surface transverse fields on the critical temperature are discussed by including the modification of surface exchange interaction. Some characteristic features are found in the phase diagrams when the ratio p increases from p = 1.0. They are enhanced for the film with thickness L smaller than 5.0. In particular, the critical ratio at which the critical temperature of the film with a finite transverse field reduces to zero, being independent of L, exhibits a linear relation when it is plotted against the modification of surface exchange interaction.