By D.J. Sellmyer, Ralph Skomski
Complicated Magnetic Nanostructures is dedicated to the fabrication characterization, experimental research, theoretical knowing, and usage of complicated magnetic nanostructures. the focal point is on a number of different types of 'bottom-up' and 'top-down' synthetic nanostructures, as contrasted to certainly taking place magnetic nanostructures akin to iron-oxide inclusions in magnetic rocks, and to buildings akin to ideal skinny movies
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D. Coey, "Magnetic Glasses", Elsevier, Amsterdam 1984. M. Uhl and J. Kubler, Phys. Rev. Lett. 77, 334 (1996). A. I. Liechtenstein, M. I. Katsnelson, V. P. Antropov, and V. A. Gubanov, J. Magn. Magn. Mater. 67,65 (1987). V. A. Gubanov, A. I. Liechtenstein, and A. V. Postnikov, "Magnetism and the Electronic Structure of Crystals", Springer, Berlin 1992. R. F. Sabirianov and S. Jaswa1, Phys. Rev B 57,7767 (1998). A. Kashyap, R. Skomski, R. F. Sabiryanov, S. S. Jaswal, and D. J. Sellmyer, IEEE Trans.
The corresponding exchange-correlation potential depends only on the majority and minority spin densities. Different magnetic structures, such as paramagnetic, ferromagnetic and various antiferromagnetic configurations, exhibit different total energies, and the lowest energy configuration obtained by local density theory represents the observed magnetic state in most cases. Room-temperature ferromagnetism occurs in rather few elements, Fe, Co, Ni, Gd, and several other rare earths are ferromagnetic at low temperatures.
More realistic models contain small domains with local order whose orientations are starting to fluctuate when approaching the Curie temperature (Ch. 3). Some degree of local correlation remains even above Tc. Such a picture brings in spin wave excitations (magnons) which are not contained in the ground state energy bands. The efforts to model the spin structure just below and above the Curie point from first principles give 22 A. Kashyap et al. qualitatively correct Curie temperatures , even if the method used in the paper is more appropriate to very weak itinerant ferromagnets such as ZrZnz (Ch.
Advanced Magnetic Nanostructures by D.J. Sellmyer, Ralph Skomski