A R Volkel et al 1992 J. Phys.: Condens. Matter 4 9411 doi:10.1088/0953-8984/4/47/021
A R Volkel, A R Bishop, F G Mertens and G M Wysin
Show affiliationsThe authors present a discussion of the dynamical correlation functions for Heisenberg magnets with a weak easy-plane anisotropy for temperatures just above the Kosterlitz-Thouless phase transition. Compared to the XY-model they find here vortices which have in addition to the well known in-plane structure a localized out-of-plane profile around their centre. For the ferromagnetic case this structure produces an effective magnetic field which acts as a gyro force on the other vortices. Assuming a dilute gas of weakly interacting vortices, they find analytic expressions for the vortex contribution to the dynamical correlation functions. These results are compared (i) with numerical Monte Carlo-molecular dynamics simulations on a 100*100 square lattice allowing them to determine values for the vortex correlation length xi and average vortex velocity u and (ii) with experiments performed on different quasi-two-dimensional magnetic materials.
75.10.-b General theory and models of magnetic ordering
75.30.Kz Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.)
71.45.Gm Exchange, correlation, dielectric and magnetic response functions, plasmons
Issue 47 (23 November 1992)
A R Volkel et al 1992 J. Phys.: Condens. Matter 4 9411
J Schnack et al 2006 J. Phys.: Conf. Ser. 51 43
H M Barlow 1973 J. Phys. D: Appl. Phys. 6 929
Long Jin et al 2008 J. Geophys. Eng. 5 210
Vl A Margulis and E A Gaiduk 2001 J. Opt. A: Pure Appl. Opt. 3 267
H Harper and R W Teale 1968 J. Phys. C: Solid State Phys. 1 1046
A I Kucharska et al 1989 J. Phys. G: Nucl. Part. Phys. 15 1039
Huw Oliver et al 1998 Distrib. Syst. Engng. 5 19
Christos Karamanolis and Jeff Magee 1998 Distrib. Syst. Engng. 5 29
Bo Chen et al 2006 New J. Phys. 8 274