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SUMMARY:Skyrmions: Topological Excitations and Novel Computing Paradigms
DTSTART:20171124T151500
DTSTAMP:20260916T043948Z
UID:0e0e93e0a3049443d17a74072c47e31eee42abc675ecf9b5d374e8fb
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. Avadh Saxena\, Los Alamos National Lab\nStable topolo
 gical  excitations such  as domain  walls and vortices are  ubiqui
 tous in condensed   matter as  well as  high  energy  physics a
 nd  are  responsible  for  many emergent  phenomena. In 2009 a 
 new mesoscopic spin texture called skyrmion was discovered  experimenta
 lly  in  certain  conducting  and  insulating  magnets.  It  is 
  now  believed to exist in Bose-Einstein condensates\, 2D electron gase
 s\, superconductors\, nematic liquid crystals among many other systems. 
 This topological excitation was originally proposed by Tony Skyrme in 195
 8 in a nonlinear field theory of baryons. In the temperature-magnetic fi
 eld phase diagram of chiral magnets\, skyrmions form a  triangular  lat
 tice  in  the  low  temperature  and  intermediate  magnetic  fi
 eld  region   (in  thin  films).  In  metallic  magnets\, 
  skyrmions  can  be  driven  by  a  spin  polarized current
  while in insulating magnets by magnons. The threshold current density to
  depin  skyrmions  is  4  to  5  orders  of  magnitude  weaker 
  than  that  for  magnetic domain walls. The low depinning current ma
 kes skyrmions extremely promising for applications in spintronics.  I w
 ill first attempt to summarize the experiments and present  an  overvie
 w  on  skyrmions.  Then I will demonstrate how the interplay of Dzya
 loshinskii-Moriya (DM) interaction and magnetic anisotropy stabilizes sky
 rmions. New ways of computing that arise from specific spintronics applic
 ations due to the underlying spin-orbit coupling and skyrmionics will al
 so be explored in this context. \n \nAbout the research of the speaker:
  http://cnls.lanl.gov/external/people/Avadh_Saxena.php\n \nHost: Jean-Ph
 ilippe Ansermet\n 
LOCATION:CE 106
STATUS:CONFIRMED
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