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DESCRIPTION:Paradoxes of ultrafast antiferromagnetism and writing of antife
 rromagnetic bits\n\n[中科院国际杰出学者A.V. Kimel 教授访问强
 磁场中心----强磁场科学中心] Alexey Kimel obtained his PhD from 
 the Ioffe Institute (St. Petersburg\, Russia) and joined the Institute for
  Molecules and Materials (IMM) at Radboud University as a postdoctoral res
 earcher in 2002.He was subsequently appointed Assistant Professor in 2007\
 , Associate Professor in 2013\, and Full Professor in 2017.He pioneered ul
 trafast spin dynamics in antiferromagnetic materials [PRL89\, 287401 (2002
 )\, Nature 435 655–657 (2005)] and his works in a large extent defined t
 he development of ultrafast magnetism during the last two decades. He is a
  co-inventor of ultrafast all-optical magnetic recording [PRL99\, 047601 (
 2007)] and inertia of spins in antiferromagnets [Nature-Physics5\, 727–7
 31 (2009)]\, as a recognized world-leader in the field he obtained several
  prestigious research grants (Veni2004\, Vidi2006\, Vici2017\, ERC-SG2010\
 , Russian MegaGrant-2013\, ERC-AG2022).Starting from September 2025\, he s
 erves as the Research Director of the Institute for Molecules and Material
 s.\n\nAbstract: Ultrafast spin dynamics in antiferromagnets is paradoxical
 . While commonly accepted Curie-Neumann’s principle states that “the s
 ymmetries of the causes are to be found in the effects” [1] and implies 
 that a magnetic field cannot control antiferromagnetic Néel vector\, rapi
 dly changing THz magnetic field appears to “violate” this principle an
 d can effectively excite spins in antiferromagnets . In this ultrafast reg
 ime\, laser-induced spin dynamics in antiferromagnets is intrinsically non
 -linear [2-4]\, where new channels of spin-lattice interaction open-up [2\
 ,3]\, the principle of superposition fails\, i.e. 1+1&gt;2 [4]\, and antiferr
 omagnets appear to host even more channels to excite spins [5-7] than one 
 can find in ferromagnets. We will review recent progress in ultrafast anti
 ferromagnetic spin dynamics\, highlight the recently discovered mechanism 
 enabling control of antiferromagnetic spins by a THz electric field [6]\, 
 and discuss the conditions required for reliable writing of stable antifer
 romagnetic bits [8].\n\n[1] P. Curie\, “On Symmetry in Physical Phenomen
 a”\, J. Phys. Theor. Appl.\, 393–415 (1894).\n\n[2] E. A. Mashkovich e
 t al\, “Empowering Control of Antiferromagnets by THz-Induced Spin Coher
 ence”\, Science 374\, 1608-1611 (2021).\n\n[3] T. Metzger et al\, “Mag
 non-phonon Fermi resonance in antiferromagnetic CoF2”Nature Communicatio
 ns 15\, 5472 (2024).\n\n[4] T. G. H. Blank et al\, Phys. Rev. Lett. 131\, 
 096701 (2023).\n\n[5] Y. Behovits et al\, “Terahertz Néel spin-orbit to
 rques drive nonlinear magnon dynamics in antiferromagnetic Mn2Au” Nature
  Communications 14\, 6038 (2023).\n\n[6] V. Bilyk et al\, “Control of sp
 ins in collinear antiferromagnet Cr2O3 by terahertz electric fields”Newt
 on 1\, 6100132\, (2025).\n\n[7] R. M. Dubrovin\, A. V. Kimel\, A. K. Zvezd
 in\, “Competition between terahertz magnetoelectric and Néel spin-orbit
  torque driven spin dynamics in metallic antiferromagnets” Phys. Rev. B 
 112\, 064402 (2025).\n\n[8] N. Khokhlov et al.\, in preparation\n\nRoom: 4
 -A014\, Bldg: Institut Jean Lamour \, 5 Allee Guinier\, Nancy\, Lorraine\,
  France\, 54011
LOCATION:Room: 4-A014\, Bldg: Institut Jean Lamour \, 5 Allee Guinier\, Nan
 cy\, Lorraine\, France\, 54011
ORGANIZER:stephane.mangin@univ-lorraine.fr
SEQUENCE:4
SUMMARY:Paradoxes of ultrafast antiferromagnetism and writing of antiferrom
 agnetic bits
URL;VALUE=URI:https://events.vtools.ieee.org/m/547022
X-ALT-DESC:Description: &lt;br /&gt;&lt;p class=&quot;Heading&quot;&gt;&lt;strong&gt;&lt;span lang=&quot;HU&quot;&gt;Pa
 radoxes of ultrafast antiferromagnetism and writing of antiferromagnetic b
 its&lt;/span&gt;&lt;/strong&gt;&lt;/p&gt;\n&lt;p class=&quot;Heading&quot;&gt;&amp;nbsp\;&lt;/p&gt;\n&lt;p&gt;&lt;img src=&quot;http
 s://events.vtools.ieee.org/vtools_ui/media/display/53471483-451a-4e75-9b60
 -fe8a217445fd&quot; alt=&quot;中科院国际杰出学者A.V. Kimel 教授访问强
 磁场中心----强磁场科学中心&quot; width=&quot;94&quot; height=&quot;105&quot; align=&quot;left
 &quot; hspace=&quot;12&quot;&gt;&amp;nbsp\;Alexey Kimel obtained his PhD from the Ioffe Institut
 e (St. Petersburg\, Russia) and joined the Institute for Molecules and Mat
 erials (IMM) at Radboud University as a postdoctoral researcher in 2002.He
  was subsequently appointed Assistant Professor in 2007\, Associate Profes
 sor in 2013\, and Full Professor in 2017.He pioneered ultrafast spin dynam
 ics in antiferromagnetic materials [PRL89\, 287401 (2002)\, Nature 435 655
 &amp;ndash\;657 (2005)] and his works in a large extent defined the developmen
 t of ultrafast magnetism during the last two decades. He is a co-inventor 
 of ultrafast all-optical magnetic recording [PRL99\, 047601 (2007)] and in
 ertia of spins in antiferromagnets [Nature-Physics5\, 727&amp;ndash\;731 (2009
 )]\, as a recognized world-leader in the field he obtained several prestig
 ious research grants (Veni2004\, Vidi2006\, Vici2017\, ERC-SG2010\, Russia
 n MegaGrant-2013\, ERC-AG2022).Starting from September 2025\, he serves as
  the Research Director of the Institute for Molecules and Materials.&lt;/p&gt;\n
 &lt;p class=&quot;MsoNormal&quot;&gt;&lt;strong&gt;&lt;span lang=&quot;EN-US&quot;&gt;Abstract:&lt;/span&gt;&lt;/strong&gt; 
 Ultrafast spin dynamics in antiferromagnets is paradoxical.&amp;nbsp\; While c
 ommonly accepted Curie-Neumann&amp;rsquo\;s principle states that &amp;ldquo\;the 
 symmetries of the causes are to be found in the effects&amp;rdquo\; [1] and im
 plies that a magnetic field cannot control antiferromagnetic N&amp;eacute\;el 
 vector\, rapidly changing THz magnetic field appears to &amp;ldquo\;violate&amp;rd
 quo\; this principle and can effectively excite spins in antiferromagnets 
 . In this ultrafast regime\, laser-induced spin dynamics in antiferromagne
 ts is intrinsically non-linear [2-4]\, where new channels of spin-lattice 
 interaction open-up [2\,3]\, the principle of superposition fails\, i.e. 1
 +1&amp;gt\;2 [4]\, and antiferromagnets appear to host even more channels to e
 xcite spins [5-7] than one can find in ferromagnets. &lt;span lang=&quot;HU&quot;&gt;We wi
 ll review recent progress in ultrafast antiferromagnetic spin dynamics\, h
 ighlight the recently discovered mechanism enabling control of antiferroma
 gnetic spins by a THz electric field [6]\, and discuss the conditions requ
 ired for reliable writing of stable antiferromagnetic bits [8].&lt;/span&gt;&lt;/p&gt;
 \n&lt;p class=&quot;References&quot;&gt;&lt;!-- [if !supportLists]--&gt;&lt;span lang=&quot;EN-US&quot;&gt;[1]&amp;n
 bsp\;&amp;nbsp\;&amp;nbsp\;&amp;nbsp\; &lt;/span&gt;&lt;!--[endif]--&gt;&lt;span lang=&quot;EN-US&quot;&gt;P. Curi
 e\, &amp;ldquo\;&lt;/span&gt;&lt;span lang=&quot;HU&quot;&gt;On Symmetry in Physical Phenomena&amp;rdquo
 \;\, &lt;/span&gt;&lt;em&gt;&lt;span lang=&quot;EN-US&quot;&gt;J. Phys. Theor. Appl&lt;/span&gt;&lt;/em&gt;&lt;span l
 ang=&quot;EN-US&quot;&gt;.\, 393&amp;ndash\;415 (1894). &lt;/span&gt;&lt;/p&gt;\n&lt;p class=&quot;References&quot;&gt;
 &lt;!-- [if !supportLists]--&gt;&lt;span lang=&quot;EN-US&quot;&gt;[2]&amp;nbsp\;&amp;nbsp\;&amp;nbsp\;&amp;nbsp
 \; &lt;/span&gt;&lt;!--[endif]--&gt;&lt;span lang=&quot;EN-US&quot;&gt;E. A. Mashkovich et al\, &amp;ldquo
 \;Empowering Control of Antiferromagnets by THz-Induced Spin Coherence&lt;str
 ong&gt;&amp;rdquo\;\, &lt;/strong&gt;&lt;em&gt;Science&lt;/em&gt; 374\, 1608-1611 (2021).&lt;/span&gt;&lt;/p
 &gt;\n&lt;p class=&quot;References&quot;&gt;&lt;!-- [if !supportLists]--&gt;&lt;span lang=&quot;EN-US&quot;&gt;[3]&amp;
 nbsp\;&amp;nbsp\;&amp;nbsp\;&amp;nbsp\; &lt;/span&gt;&lt;!--[endif]--&gt;&lt;span lang=&quot;EN-US&quot;&gt;T. Met
 zger et al\, &amp;ldquo\;Magnon-phonon Fermi resonance in antiferromagnetic Co
 F&lt;sub&gt;2&lt;/sub&gt;&lt;strong&gt;&amp;rdquo\;&lt;/strong&gt;&lt;em&gt;Nature Communications&lt;/em&gt; 15\, 
 5472 (2024).&lt;/span&gt;&lt;/p&gt;\n&lt;p class=&quot;References&quot;&gt;&lt;!-- [if !supportLists]--&gt;&lt;
 span lang=&quot;EN-US&quot;&gt;[4]&amp;nbsp\;&amp;nbsp\;&amp;nbsp\;&amp;nbsp\; &lt;/span&gt;&lt;!--[endif]--&gt;&lt;sp
 an lang=&quot;NL&quot;&gt;T. G. H. Blank et al\, &lt;em&gt;Phys. &lt;/em&gt;&lt;/span&gt;&lt;em&gt;&lt;span lang=&quot;
 EN-US&quot;&gt;Rev. Lett&lt;/span&gt;&lt;/em&gt;&lt;span lang=&quot;EN-US&quot;&gt;. 131\, 096701 (2023).&lt;/spa
 n&gt;&lt;/p&gt;\n&lt;p class=&quot;References&quot;&gt;&lt;!-- [if !supportLists]--&gt;&lt;span lang=&quot;EN-US&quot;
 &gt;[5]&amp;nbsp\;&amp;nbsp\;&amp;nbsp\;&amp;nbsp\; &lt;/span&gt;&lt;!--[endif]--&gt;&lt;span lang=&quot;EN-US&quot;&gt;Y
 . Behovits et al\, &amp;ldquo\;Terahertz N&amp;eacute\;el spin-orbit torques drive
  nonlinear magnon dynamics in antiferromagnetic Mn&lt;sub&gt;2&lt;/sub&gt;Au&amp;rdquo\;&lt;s
 trong&gt; &lt;/strong&gt;&lt;em&gt;Nature Communications&lt;/em&gt; 14\, 6038 (2023).&lt;/span&gt;&lt;/p
 &gt;\n&lt;p class=&quot;References&quot;&gt;&lt;!-- [if !supportLists]--&gt;&lt;span lang=&quot;EN-US&quot;&gt;[6]&amp;
 nbsp\;&amp;nbsp\;&amp;nbsp\;&amp;nbsp\; &lt;/span&gt;&lt;!--[endif]--&gt;&lt;span lang=&quot;EN-GB&quot;&gt;V. Bil
 yk et al\, &amp;ldquo\;&lt;/span&gt;&lt;span lang=&quot;EN-US&quot;&gt;Control of spins in collinear
  antiferromagnet Cr&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt;&amp;nbsp\;by terahertz electric f
 ields&amp;rdquo\;&lt;/span&gt;&lt;em&gt;&lt;span lang=&quot;EN-GB&quot;&gt;Newton &lt;/span&gt;&lt;/em&gt;&lt;span lang=&quot;
 EN-GB&quot;&gt;1\, 6100132\, (2025).&lt;/span&gt;&lt;/p&gt;\n&lt;p class=&quot;References&quot;&gt;&lt;!-- [if !s
 upportLists]--&gt;&lt;strong&gt;&lt;span lang=&quot;EN-US&quot;&gt;[7]&amp;nbsp\;&amp;nbsp\;&amp;nbsp\; &lt;/span&gt;
 &lt;/strong&gt;&lt;!--[endif]--&gt;&lt;span lang=&quot;EN-GB&quot;&gt;R. M. Dubrovin\, A. V. Kimel\, A
 . K. Zvezdin\, &amp;ldquo\;&lt;/span&gt;&lt;span lang=&quot;EN-US&quot;&gt;Competition between terah
 ertz magnetoelectric and N&amp;eacute\;el spin-orbit torque driven spin dynami
 cs in metallic antiferromagnets&amp;rdquo\;&lt;/span&gt; &lt;em&gt;&lt;span lang=&quot;EN-GB&quot;&gt;Phys
 . &lt;/span&gt;&lt;/em&gt;&lt;em&gt;&lt;span lang=&quot;EN-US&quot;&gt;Rev. B&lt;/span&gt;&lt;/em&gt;&lt;span lang=&quot;EN-US&quot;&gt;
  112\, 064402 (2025).&lt;/span&gt;&lt;/p&gt;\n&lt;p class=&quot;References&quot;&gt;&lt;!-- [if !supportL
 ists]--&gt;&lt;strong&gt;&lt;span lang=&quot;EN-US&quot;&gt;[8]&amp;nbsp\;&amp;nbsp\;&amp;nbsp\; &lt;/span&gt;&lt;/stron
 g&gt;&lt;!--[endif]--&gt;&lt;span lang=&quot;HU&quot;&gt;N. Khokhlov &lt;em&gt;et al&lt;/em&gt;.\, in preparati
 on&lt;/span&gt;&lt;/p&gt;\n&lt;p class=&quot;MsoNormal&quot;&gt;&amp;nbsp\;&lt;/p&gt;\n&lt;p class=&quot;MsoNormal&quot;&gt;&lt;spa
 n lang=&quot;EN-US&quot;&gt;&amp;nbsp\;&lt;/span&gt;&lt;/p&gt;\n&lt;p class=&quot;MsoNormal&quot;&gt;&amp;nbsp\;&lt;/p&gt;
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