BEGIN:VCALENDAR VERSION:2.0 PRODID:IEEE vTools.Events//EN CALSCALE:GREGORIAN BEGIN:VTIMEZONE TZID:America/Chicago BEGIN:DAYLIGHT DTSTART:20230312T030000 TZOFFSETFROM:-0600 TZOFFSETTO:-0500 RRULE:FREQ=YEARLY;BYDAY=2SU;BYMONTH=3 TZNAME:CDT END:DAYLIGHT BEGIN:STANDARD DTSTART:20231105T010000 TZOFFSETFROM:-0500 TZOFFSETTO:-0600 RRULE:FREQ=YEARLY;BYDAY=1SU;BYMONTH=11 TZNAME:CST END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTAMP:20240402T042827Z UID:F384BF20-1B95-43FD-BE3D-743DB44E1C6C DTSTART;TZID=America/Chicago:20231005T100000 DTEND;TZID=America/Chicago:20231005T110000 DESCRIPTION:Zoom link: https://argonne.zoomgov.com/j/1617371892?pwd=MEpZbFF JaVVPZ29YbDBkV215ZkVMQT09\n\nSpeaker: Professor J. PING LIU\n\n2023 IEEE D istinguished Lecturer in Magnetic Society\n\nDistinguished University Prof essor\nDepartment of Physics\nUniversity of Texas\, Arlington\n\nDate: Thu rsday\, October 5\, 2023\nTime: 10:00 AM CDT\n\nAbstract:\n\nHow “hard ” (coercive) a ferromagnet can be has been a puzzle for a century. Seven decades ago\, William Fuller Brown offered his famous theorem to correlat e coercivity with the magnetocrystalline anisotropy fields in ferromagneti c materials. However\, the experimental coercivity values have been far be low the calculated levels given by the theorem\, which is called Brown’s Coercivity Paradox. Researchers have attempted to solve the paradox with sustained efforts\; however\, the paradox remains unsolved\, and coercivit y still cannot be predicted and calculated quantitatively by modeling.\n\n Progress has been made in the past 20 years in understanding coercivity me chanisms in nanoscale low-dimensional ferromagnets. In fact\, ferromagneti sm is a size-dependent physical phenomenon\, as revealed by theoretical st udies. However\, nanoscale ferromagnetic samples with controllable size an d shape have been available only in recent times. By adopting newly develo ped salt-matrix annealing\, surfactant-assisted milling\, and improved hyd rothermal and chemical solution techniques\, we used a bottom-up approach to produce nanostructured magnets and have successfully synthesized monodi sperse ferromagnetic Fe-Pt\, Fe-Co and Sm-Co nanoparticles and Co nanowire s with extraordinary properties\, which are strongly size- and shape-depen dent. A study on size-dependent Curie temperature of the L10 ferromagnetic nanoparticles with sizes down to 2 nm has experimentally proved a finite- size effect. A systematic study of nanowires with extremely high coercivit y above their magnetocrystalline anisotropy fields has opened a door to th e solution of Brown’s Paradox.\n\nBio:\n\nJ. Ping Liu received the Ph.D. degree in Physics at the University of Amsterdam\, The Netherlands. He is a Distinguished University Professor at the University of Texas at Arling ton\, USA. For the past four decades he has worked in research and develop ment of permanent magnets and related magnetic materials in China\, Europe \, and the U.S. His recent research has been focused on hard magnetic nano particles\, thin films\, and bulk nanocomposites\, as reported in his more than 320 peer-reviewed journal papers\, review articles\, and books\, inc luding Nanoscale Magnetic Materials and Applications\, (Springer\, 2009)\, Skyrmions: Topological Structures\, Properties\, and Applications (CRC Pr ess\, 2016)\, and Permanent Magnets: The History and Future (Science Press \, 2020). He has supervised more than 50 graduate students and postdoctora l researchers. He is an elected Fellow of the American Physical Society an d the IEEE. He received the Outstanding Achievement Award at the 25th Inte rnational Workshop on Rare-Earth and Future Permanent Magnets and Their Ap plications in 2018.\n\nCo-sponsored by: IEEE Chicago\, IEEE NTC Young Prof essionals\n\nRoom: A323\, Bldg: 241\, Argonne National Laboratory\, Lemont \, Illinois\, United States\, Virtual: https://events.vtools.ieee.org/m/37 6456 LOCATION:Room: A323\, Bldg: 241\, Argonne National Laboratory\, Lemont\, Il linois\, United States\, Virtual: https://events.vtools.ieee.org/m/376456 ORGANIZER:yili@anl.gov SEQUENCE:20 SUMMARY:(Oct. 5\, 2023) Magnetic Hardening in Low-Dimensional Ferromagnets URL;VALUE=URI:https://events.vtools.ieee.org/m/376456 X-ALT-DESC:Description: <br /><p>Zoom link: <a id="LPNoLPOWALinkPreview" cl ass="x_OWAAutoLink" href="https://argonne.zoomgov.com/j/1617371892?pwd=MEp ZbFFJaVVPZ29YbDBkV215ZkVMQT09" target="_blank" rel="noopener noreferrer" d ata-auth="NotApplicable" data-linkindex="0">https://argonne.zoomgov.com/j/ 1617371892?pwd=MEpZbFFJaVVPZ29YbDBkV215ZkVMQT09</a></p>\n<p><strong>Speake r: Professor J. PING LIU</strong></p>\n<p><strong>2023 IEEE Distinguished Lecturer in Magnetic Society</strong></p>\n<p><strong>Distinguished Univer sity Professor</strong><br><strong>Department of Physics</strong><br><stro ng>University of Texas\, Arlington&nbsp\;</strong></p>\n<p><strong>Date: T hursday\, October 5\, 2023</strong><br><strong>Time: 10:00 AM CDT</strong> </p>\n<p><strong>Abstract:</strong></p>\n<p>How &ldquo\;hard&rdquo\; (coer cive) a ferromagnet can be has been a puzzle for a century. Seven decades ago\, William Fuller Brown offered his famous theorem to correlate coerciv ity with the magnetocrystalline anisotropy fields in ferromagnetic materia ls. However\, the experimental coercivity values have been far below the c alculated levels given by the theorem\, which is called Brown&rsquo\;s Coe rcivity Paradox. Researchers have attempted to solve the paradox with sust ained efforts\; however\, the paradox remains unsolved\, and coercivity st ill cannot be predicted and calculated quantitatively by modeling.</p>\n<p >&nbsp\;</p>\n<p>Progress has been made in the past 20 years in understand ing coercivity mechanisms in nanoscale low-dimensional ferromagnets. In fa ct\, ferromagnetism is a size-dependent physical phenomenon\, as revealed by theoretical studies. However\, nanoscale ferromagnetic samples with con trollable size and shape have been available only in recent times. By adop ting newly developed salt-matrix annealing\, surfactant-assisted milling\, and improved hydrothermal and chemical solution techniques\, we used a bo ttom-up approach to produce nanostructured magnets and have successfully s ynthesized monodisperse ferromagnetic Fe-Pt\, Fe-Co and Sm-Co nanoparticle s and Co nanowires with extraordinary properties\, which are strongly size - and shape-dependent. A study on size-dependent Curie temperature of the L10 ferromagnetic nanoparticles with sizes down to 2 nm has experimentally proved a finite-size effect. A systematic study of nanowires with extreme ly high coercivity above their magnetocrystalline anisotropy fields has op ened a door to the solution of Brown&rsquo\;s Paradox.&nbsp\;</p>\n<p><str ong>Bio:</strong></p>\n<p>J. Ping Liu received the Ph.D. degree in Physics at the University of Amsterdam\, The Netherlands. He is a Distinguished U niversity Professor at the University of Texas at Arlington\, USA. For the past four decades he has worked in research and development of permanent magnets and related magnetic materials in China\, Europe\, and the U.S. Hi s recent research has been focused on hard magnetic nanoparticles\, thin f ilms\, and bulk nanocomposites\, as reported in his more than 320 peer-rev iewed journal papers\, review articles\, and books\, including Nanoscale M agnetic Materials and Applications\, (Springer\, 2009)\, Skyrmions: Topolo gical Structures\, Properties\, and Applications &nbsp\;(CRC Press\, 2016) \, and Permanent Magnets: The History and Future (Science Press\, 2020). H e has supervised more than 50 graduate students and postdoctoral researche rs. He is an elected Fellow of the American Physical Society and the IEEE. He received the Outstanding Achievement Award at the 25th International W orkshop on Rare-Earth and Future Permanent Magnets and Their Applications in 2018.</p>\n<p>&nbsp\;</p> END:VEVENT END:VCALENDAR