BEGIN:VCALENDAR VERSION:2.0 PRODID:IEEE vTools.Events//EN CALSCALE:GREGORIAN BEGIN:VTIMEZONE TZID:America/Denver BEGIN:DAYLIGHT DTSTART:20250309T030000 TZOFFSETFROM:-0700 TZOFFSETTO:-0600 RRULE:FREQ=YEARLY;BYDAY=2SU;BYMONTH=3 TZNAME:MDT END:DAYLIGHT BEGIN:STANDARD DTSTART:20251102T010000 TZOFFSETFROM:-0600 TZOFFSETTO:-0700 RRULE:FREQ=YEARLY;BYDAY=1SU;BYMONTH=11 TZNAME:MST END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTAMP:20250919T181246Z UID:1339BEBA-4EF8-4090-92AB-B6EE64618EF2 DTSTART;TZID=America/Denver:20250912T110000 DTEND;TZID=America/Denver:20250912T120000 DESCRIPTION:The development of next-generation computing devices based on s pintronics and magnonics requires an understanding of how magnetic spin te xtures can be tailored in patterned magnetic materials. Within the wide ra nge of magnetic materials available\, complex oxides such as ferromagnetic (FM) La0.7Sr0.3MnO3 (LSMO) and antiferromagnetic (AF) La1-xSrxFeO3 (LSFO) provide an ideal platform for tailoring magnetic spin textures when litho graphically patterned as nano/micromagnets. This unique tunability arises due to the strong interactions among charge\, spin\, lattice\, and orbital degrees of freedom. In this talk I demonstrate how an intricate interplay exists between shape and magnetocrystalline anisotropy energies as well a s 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 temperatu re [1]-[3]. These spin textures are imaged using x-ray photoemission elect ron microscopy for a variety of shapes (circles\, squares\, triangles\, an d hexagons with their edges oriented along different low-index crystallogr aphic directions) with and without their core regions removed (“donut st ructures”). LSMO nanomagnets are also patterned into artificial spin-ice (ASI) structures [4]-[5]\, where large arrays of nanomagnets are arranged in geometries where all the magnetic interactions cannot be satisfied sim ultaneously. While one might expect shape anisotropy to dictate Ising stat es in the nanomagnets\, the unique combination of magnetic parameters asso ciated with LSMO enables the formation of both Ising and complex spin text ures (CSTs) based on the nano-island width and spacing. These CSTs consist of single and double vortices and alter the nature of dipolar coupling am ong nanomagnets\, giving rise to exotic physics in the ASI lattices. These studies demonstrate that complex oxides provide a unique platform for eng ineering FM and AF spin textures for next-generation spin-based devices.\n \n[1] Y. Takamura et al.\, “Spin-Flop Coupling and Exchange Bias in Embe dded Complex Oxide Micromagnets\,” Phys. Rev. Lett.\, vol. 111\, 107201\ , Sep 2013.\n[2] M. S. Lee et al.\, “Tailoring Spin Textures in Complex Oxide Micromagnets\,” ACS Nano\, vol. 10\, pp. 8545-8551\, Sep 2016.\n[3 ] M. S. Lee et al.\, “Controlling Antiferromagnetic Domains in Patterned La0.7Sr0.3FeO3 Thin Films\,” J. Appl. Phys.\, vol. 127\, 203901\, May 2 020.\n[4] R. V. Chopdekar et al.\, “Nanostructured Complex Oxides as a R oute Towards Thermal Behavior in Artificial Spin Ice Systems\,” Phys. Re v. Mater.\, vol. 1\, 024401\, Jul 2017.\n[5] D. Sasaki et al.\, “Formati on of Complex Spin Textures in Thermally Demagnetized La0.7Sr0.3MnO3 Artif icial-Spin-Ice Structures\,” Phys. Rev. Appl.\, vol. 17\, 064057\, Jun 2 022.\n\nCo-sponsored by: UCCS\n\nSpeaker(s): Yayoi Takamura\n\nRoom: A204\ , Bldg: Osborne Center for Science and Engineering\, 1420 Austin Bluffs Pk wy\, Colorado Springs\, Colorado\, United States\, 80918\, Virtual: https: //events.vtools.ieee.org/m/494637 LOCATION:Room: A204\, Bldg: Osborne Center for Science and Engineering\, 14 20 Austin Bluffs Pkwy\, Colorado Springs\, Colorado\, United States\, 8091 8\, Virtual: https://events.vtools.ieee.org/m/494637 ORGANIZER:eiacocca@uccs.edu SEQUENCE:3 SUMMARY:Tailoring magnetic spin textures in La0.7Sr0.3MnO3-based micromagne ts URL;VALUE=URI:https://events.vtools.ieee.org/m/494637 X-ALT-DESC:Description: <br /><p style="text-align: justify\;">The developm ent of next-generation computing devices based on spintronics and magnonic s requires an understanding of how magnetic spin textures can be tailored in patterned magnetic materials. Within the wide range of magnetic materia ls available\, complex oxides such as ferromagnetic (FM) La<sub>0.7</sub>S r<sub>0.3</sub>MnO<sub>3</sub> (LSMO) and antiferromagnetic (AF) La<sub>1- x</sub>Sr<sub>x</sub>FeO<sub>3</sub> (LSFO) provide an ideal platform for tailoring magnetic spin textures when lithographically patterned as nano/m icromagnets. This unique tunability arises due to the strong interactions among charge\, spin\, lattice\, and orbital degrees of freedom. In this ta lk I demonstrate how an intricate interplay exists between shape and magne tocrystalline anisotropy energies as well as exchange coupling interaction s at LSMO/LSFO interfaces. Therefore\, the resulting AF and FM spin textur es can be controlled using parameters such as the LSMO and LSFO layer thic knesses\, micromagnet shape\, and temperature [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 ori ented along different low-index crystallographic directions) with and with out their core regions removed (&ldquo\;donut structures&rdquo\;). LSMO na nomagnets are also patterned into artificial spin-ice (ASI) structures [4] -[5]\, where large arrays of nanomagnets are arranged in geometries where all the magnetic interactions cannot be satisfied simultaneously. While on e might expect shape anisotropy to dictate Ising states in the nanomagnets \, the unique combination of magnetic parameters associated with LSMO enab les the formation of both Ising and complex spin textures (CSTs) based on the nano-island width and spacing. These CSTs consist of single and double vortices and alter the nature of dipolar coupling among nanomagnets\, giv ing rise to exotic physics in the ASI lattices. These studies demonstrate that complex oxides provide a unique platform for engineering FM and AF sp in textures for next-generation spin-based devices.</p>\n<p class="text-sm ">[1] &nbsp\;Y. Takamura et al.\, &ldquo\;Spin-Flop Coupling and Exchange Bias in Embedded Complex Oxide Micromagnets\,&rdquo\; Phys. Rev. Lett.\, v ol. 111\, 107201\, Sep 2013.&nbsp\;<br>[2] &nbsp\;M. S. Lee et al.\, &ldqu o\;Tailoring Spin Textures in Complex Oxide Micromagnets\,&rdquo\; ACS Nan o\, vol. 10\, pp. 8545-8551\, Sep 2016.&nbsp\;<br>[3] &nbsp\;M. S. Lee et al.\, &ldquo\;Controlling Antiferromagnetic Domains in Patterned La0.7Sr0. 3FeO3 Thin Films\,&rdquo\; J. Appl. Phys.\, vol. 127\, 203901\, May 2020.& nbsp\;<br>[4] &nbsp\;R. V. Chopdekar et al.\, &ldquo\;Nanostructured Compl ex Oxides as a Route Towards Thermal Behavior in Artificial Spin Ice Syste ms\,&rdquo\; Phys. Rev. Mater.\, vol. 1\, 024401\, Jul 2017.<br>[5] &nbsp\ ;D. Sasaki et al.\, &ldquo\;Formation of Complex Spin Textures in Thermall y Demagnetized La0.7Sr0.3MnO3 Artificial-Spin-Ice Structures\,&rdquo\; Phy s. Rev. Appl.\, vol. 17\, 064057\, Jun 2022.</p> END:VEVENT END:VCALENDAR