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SUMMARY:Magnetic skyrmions in spherical thin  films - Giovanni Di Fratta (
 Technische Universität Wien)
DTSTART:20190501T140000Z
DTEND:20190501T150000Z
UID:TALK124150@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:Curved thin films are currently of great interest due to their
  capability to support spontaneous skyrmion solutions\, i.e.\, chiral spin
  textures observable in a stable state even when no spin-orbit coupling me
 chanism\, in the guise of Dzyaloshinskii-Moriya interaction (DMI)\, is con
 sidered. The evidence of these states sheds light on the role of the geome
 try in magnetism: chiral spin-textures can be stabilized by curvature effe
 cts only\, in contrast to the planar case for which the DMI is required. I
 n addition to fundamental reasons\, the interest in these geometries is tr
 iggered by recent advances in the fabrication of magnetic spherical hollow
  nanoparticles\, which lead to artificial materials with unexpected charac
 teristics and numerous applications ranging from logic devices to biomedic
 ine.<br>In this talk\, after a brief overview of the existing literature o
 n the micromagnetics of curved thin films\, we will focus on the investiga
 tion of magnetic skyrmions in spherical thin films. The question will lead
  to a sharp Poincar&eacute\;-type inequality that allows for a precise cha
 racterization of the global minimizers of the micromagnetic energy functio
 nal on the 2-sphere.
LOCATION:Seminar Room 2\, Newton Institute
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