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UID:DSC-22897
DTSTART;TZID=Europe/Berlin:20260609T093000
SEQUENCE:1780551467
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URL:https://dresden-science-calendar.org/calendar/de/detail/22897
LOCATION:HZDR\, Bautzner Landstraße 40001328 Dresden
SUMMARY:Takamura: IEEE Distinguished Lecturer: Tailoring Magnetic Spin Text
 ures in La0.7Sr0.3MnO3-Based Micromagnets
CLASS:PUBLIC
DESCRIPTION:Speaker: Yayoi Takamura\nInstitute of Speaker: University of Ca
 lifornia\, Davis.Yayoi Takamura received the B.S. degree from Cornell Univ
 ersity in 1998 and the M.S. and Ph.D. degrees from Stanford University in 
 2000 and 2004\, all in the field of Materials Science and Engineering. She
  w\nTopics:\n\n Location:\n  Name: HZDR (106/255 - Hörsaal)\n  Street: Ba
 utzner Landstraße 400\n  City: 01328 Dresden\n  Phone: \n  Fax: \nDescrip
 tion: Abstract  The development of next-generation computing devices based
  on spintronics and magnonics requires an understanding of how magnetic sp
 in textures can be tailored in patterned magnetic materials. Within the wi
 de range of magnetic materials available\, complex oxides such as ferromag
 netic (FM) La0.7Sr0.3MnO3 (LSMO) and antiferromagnetic (AF) La1-xSrxFeO3 (
 LSFO) provide an ideal platform for tailoring magnetic spin textures when 
 lithographically patterned as nano/micromagnets. This unique tunability ar
 ises due to the strong interactions among charge\, spin\, lattice\, and or
 bital degrees of freedom. In this talk I demonstrate how an intricate inte
 rplay exists between shape and magnetocrystalline anisotropy energies as w
 ell as exchange coupling interactions at LSMO/LSFO interfaces. Therefore\,
  the resulting AF and FM spin textures can be controlled using parameters 
 such as the LSMO and LSFO layer thicknesses\, micromagnet shape\, and temp
 erature [1]-[3]. These spin textures are imaged using x-ray photoemission 
 electron microscopy for a variety of shapes (circles\, squares\, triangles
 \, and hexagons with their edges oriented along different low-index crysta
 llographic directions) with and without their core regions removed (“don
 ut structures”). LSMO nanomagnets are also patterned into artificial spi
 n-ice (ASI) structures [4]-[5]\, where large arrays of nanomagnets are arr
 anged in geometries where all the magnetic interactions cannot be satisfie
 d simultaneously. While one might expect shape anisotropy to dictate Ising
  states in the nanomagnets\, the unique combination of magnetic parameters
  associated with LSMO enables the formation of both Ising and complex spin
  textures (CSTs) based on the nano-island width and spacing. These CSTs co
 nsist of single and double vortices and alter the nature of dipolar coupli
 ng among nanomagnets\, giving rise to exotic physics in the ASI lattices. 
 These studies demonstrate that complex oxides provide a unique platform fo
 r engineering FM and AF spin textures for next-generation spin-based devic
 es.  [1]  Y. Takamura et al.\, “Spin-Flop Coupling and Exchange Bias in 
 Embedded Complex Oxide Micromagnets\,” Phys. Rev. Lett.\, vol. 111\, 107
 201\, Sep 2013.  [2]  M. S. Lee et al.\, “Tailoring Spin Textures in Com
 plex Oxide Micromagnets\,” ACS Nano\, vol. 10\, pp. 8545-8551\, Sep 2016
 .  [3]  M. S. Lee et al.\, “Controlling Antiferromagnetic Domains in Pat
 terned La0.7Sr0.3FeO3 Thin Films\,” J. Appl. Phys.\, vol. 127\, 203901\,
  May 2020.  [4]  R. V. Chopdekar et al.\, “Nanostructured Complex Oxides
  as a Route Towards Thermal Behavior in Artificial Spin Ice Systems\,” P
 hys. Rev. Mater.\, vol. 1\, 024401\, Jul 2017. [5]  D. Sasaki et al.\, “
 Formation of Complex Spin Textures in Thermally Demagnetized La0.7Sr0.3MnO
 3 Artificial-Spin-Ice Structures\,” Phys. Rev. Appl.\, vol. 17\, 064057\
 , Jun 2022.
DTSTAMP:20260604T081156Z
CREATED:20260514T053952Z
LAST-MODIFIED:20260604T053747Z
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