BEGIN:VCALENDAR VERSION:2.0 PRODID:IEEE vTools.Events//EN CALSCALE:GREGORIAN BEGIN:VTIMEZONE TZID:America/Los_Angeles BEGIN:DAYLIGHT DTSTART:20260308T030000 TZOFFSETFROM:-0800 TZOFFSETTO:-0700 RRULE:FREQ=YEARLY;BYDAY=2SU;BYMONTH=3 TZNAME:PDT END:DAYLIGHT BEGIN:STANDARD DTSTART:20261101T010000 TZOFFSETFROM:-0700 TZOFFSETTO:-0800 RRULE:FREQ=YEARLY;BYDAY=1SU;BYMONTH=11 TZNAME:PST END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTAMP:20260831T195710Z UID:AEF76F47-60F2-4250-9998-A7FF445493C1 DTSTART;TZID=America/Los_Angeles:20260824T150000 DTEND;TZID=America/Los_Angeles:20260824T160000 DESCRIPTION:Spintronics has transformed our ability to generate\, transfer\ , and manipulate angular momentum in solids\, enabling powerful strategies for current-driven control of magnetic states and devices. Despite its re markable success\, the field has traditionally been built upon three simpl ifying assumptions: a classical description of localized spins (magnetic m oments)\, exchange interactions that act purely between spin degrees of fr eedom\, and the predominance of spin dipole moments as the primary carrier s of angular momentum. This talk explores what new physics emerges when th ese assumptions are relaxed and when additional internal degrees of freedo m are taken seriously.\n\nIn particular\, I will discuss the role of longi tudinal quantum fluctuations in spin transfer processes [1]\, revealing re gimes where angular momentum transport cannot be captured by conventional transverse spin dynamics. I will then introduce current-driven control of magnetism mediated by orbital exchange interactions [2]\, highlighting how orbital degrees of freedom provide a qualitatively new channel for coupli ng electric currents to magnetic order. Finally\, I will present multipola r pathways for angular-momentum transport that go beyond conventional dipo lar mechanisms [3]\, opening a broader framework for spintronics and orbit ronics in which higher-rank moments play an active and controllable role.\ n\n[1] T. Lee et al.\, “Signatures of longitudinal spin pumping in a mag netic phase transition\,” Nature\, vol. 638\, pp. 106–111\, Jan. 2025\ , doi: 10.1038/s41586-024-08367-z.\n\n[2] G.-H. Lee\, K.-W. Kim\, and K.-J . Lee\, “Orbital exchange-mediated current control of magnetism\,” unp ublished\, 2025.\n\n[3] H.-W. Ko and K.-J. Lee\, “Magnetic octupole Hall effect in d-wave altermagnets\,” unpublished\, Aug. 2025\, arXiv:2508.0 0794.\n\nSpeaker(s): Kyung-Jin Lee\, Kyung-Jin Lee\n\nBerkeley\, Californi a\, United States LOCATION:Berkeley\, California\, United States ORGANIZER:peter.fischer@ieee.org SEQUENCE:11 SUMMARY:Beyond the Three Traditional Assumptions of Spintronics URL;VALUE=URI:https://events.vtools.ieee.org/m/574125 X-ALT-DESC:Description: <br /><p class="MsoNormal" style="text-align: justi fy\;"><span lang="EN-GB" style="font-size: 11.0pt\; font-family: 'Calibri' \,sans-serif\; mso-ascii-theme-font: minor-latin\; mso-fareast-font-family : Calibri\; mso-hansi-theme-font: minor-latin\; mso-bidi-theme-font: minor -latin\; mso-ansi-language: EN-GB\;">Spintronics has transformed our abili ty to generate\, transfer\, and manipulate angular momentum in solids\, en abling powerful strategies for current-driven control of magnetic states a nd devices. Despite its remarkable success\, the field has traditionally b een built upon three simplifying assumptions: a classical description of l ocalized spins (magnetic moments)\, exchange interactions that act purely between spin degrees of freedom\, and the predominance of spin dipole mome nts as the primary carriers of angular momentum. This talk explores what n ew physics emerges when these assumptions are relaxed and when additional internal degrees of freedom are taken seriously.</span></p>\n<p class="Mso Normal" style="text-align: justify\;"><span lang="EN-GB" style="font-size: 11.0pt\; font-family: 'Calibri'\,sans-serif\; mso-ascii-theme-font: minor -latin\; mso-fareast-font-family: Calibri\; mso-hansi-theme-font: minor-la tin\; mso-bidi-theme-font: minor-latin\; mso-ansi-language: EN-GB\;">In pa rticular\, I will discuss the role of longitudinal quantum fluctuations in spin transfer processes [1]\, revealing regimes where angular momentum tr ansport cannot be captured by conventional transverse spin dynamics. I wil l then introduce current-driven control of magnetism mediated by orbital e xchange interactions [2]\, highlighting how orbital degrees of freedom pro vide a qualitatively new channel for coupling electric currents to magneti c order. Finally\, I will present multipolar pathways for angular-momentum transport that go beyond conventional dipolar mechanisms [3]\, opening a broader framework for spintronics and orbitronics in which higher-rank mom ents play an active and controllable role.</span></p>\n<p class="MsoNormal " style="text-align: justify\;"><span lang="EN-GB" style="mso-bidi-font-si ze: 11.0pt\; font-family: 'Calibri'\,sans-serif\; mso-ascii-theme-font: mi nor-latin\; mso-fareast-font-family: Calibri\; mso-hansi-theme-font: minor -latin\; mso-bidi-theme-font: minor-latin\; mso-ansi-language: EN-GB\;">[1 ] T. Lee et al.\, &ldquo\;Signatures of longitudinal spin pumping in a mag netic phase transition\,&rdquo\; Nature\, vol. 638\, pp. 106&ndash\;111\, Jan. 2025\, doi: 10.1038/s41586-024-08367-z. </span></p>\n<p class="MsoNor mal" style="text-align: justify\;"><span lang="EN-GB" style="mso-bidi-font -size: 11.0pt\; font-family: 'Calibri'\,sans-serif\; mso-ascii-theme-font: minor-latin\; mso-fareast-font-family: Calibri\; mso-hansi-theme-font: mi nor-latin\; mso-bidi-theme-font: minor-latin\; mso-ansi-language: EN-GB\;" >[2] G.-H. Lee\, K.-W. Kim\, and K.-J. Lee\, &ldquo\;Orbital exchange-medi ated current control of magnetism\,&rdquo\; unpublished\, 2025. </span></p >\n<p class="MsoNormal" style="text-align: justify\;"><span lang="EN-GB" s tyle="mso-bidi-font-size: 11.0pt\; font-family: 'Calibri'\,sans-serif\; ms o-ascii-theme-font: minor-latin\; mso-fareast-font-family: Calibri\; mso-h ansi-theme-font: minor-latin\; mso-bidi-theme-font: minor-latin\; mso-ansi -language: EN-GB\;">[3] H.-W. Ko and K.-J. Lee\, &ldquo\;Magnetic octupole Hall effect in d-wave altermagnets\,&rdquo\; unpublished\, Aug. 2025\, ar Xiv:2508.00794.</span></p>\n<p class="MsoNormal" style="text-align: justif y\;"><strong style="mso-bidi-font-weight: normal\;"><span style="font-size : 11.0pt\; mso-bidi-font-size: 9.0pt\; font-family: 'Calibri'\,sans-serif\ ; mso-ascii-theme-font: minor-latin\; mso-hansi-theme-font: minor-latin\; mso-bidi-theme-font: minor-latin\;">&nbsp\;</span></strong></p> END:VEVENT END:VCALENDAR