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SUMMARY:Equilibrium states of antiferromagnetic ring-shaped and helix-shap
 ed spin chains with hard-tangential anisotropy
DTSTART;VALUE=DATE-TIME:20181205T084500Z
DTEND;VALUE=DATE-TIME:20181205T090500Z
DTSTAMP;VALUE=DATE-TIME:20260518T025818Z
UID:indico-contribution-12@indico.bitp.kiev.ua
DESCRIPTION:Speakers: Denys Kononenko (Taras Shevchenko National Universit
 y of Kyiv)\nFor the last decade\, active research on magnetic nanosystems 
 of curved geometry was motivated by their outstanding properties and great
  application potential [1]. For instance\, recent theoretical studies of l
 ow-dimensional magnets with complex geometry propose a description of fasc
 inating geometry-induced effects including pattern formation and magnetoch
 iral effects in quasi-one-dimensional wires [2]\, for review see [1]. Desp
 ite these advances in the study of curvilinear low-dimensional ferromagnet
 s\, significant knowledge gaps exist in the study of curvilinear antiferro
 manetic systems.\nThe purpose of the current study is the theoretical inve
 stigation of equilibrium states in antiferromagnetic ring-shaped and helix
 -shaped spin chains with hard-tangential anisotropy. For this purpose we u
 se both analytical methods and computer spin-lattice simulations in SLaSi 
 software package [3]. In our study\, we consider two sublattice antiferrom
 agnet in the frame of the sigma-model approach  where its statics and dyna
 mics are described in terms of Neel vector only. \nWe  analytically show t
 hat the global energy minimum of the antiferromagnetic ring-shaped spin ch
 ain is reached when Neel vector is perpendicular to the ring plane. An equ
 ilibrium phase diagram is constructed for the antiferromagnetic helix-shap
 ed spin chain: (i) a quasi-binormal state is realized in the case of relat
 ively large curvatures and (ii) spatial-periodic state is typical in the o
 pposite case. Both states are described analytically and well confirmed by
  SLaSi.\nStability regions of both ground states are determined using spin
 -lattice simulator SLaSi.\n\n[1] R. Streubel\, P. Fischer\, F. Kronast\, V
 . P. Kravchuk\,  D. D. Sheka\, Y. Gaididei\, O. G. Schmidt and D. Makarov\
 , J. Phys. D\, 49\, 363001\, (2016). \n[2] D. D. Sheka\, V. P. Kravchuk\, 
 Y. Gaididei\,  J. Phys. A\, 48\, 125202\, (2015).\n[3] http://slasi.knu.ua
 /\n\nhttps://indico.bitp.kiev.ua/event/2/contributions/12/
LOCATION:
URL:https://indico.bitp.kiev.ua/event/2/contributions/12/
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