Ultrafast Double Pulse All-Optical Reswitching of a Ferrimagnet
All-optical reswitching has been investigated in the half-metallic Heusler ferrimagnet Mn_{2}Ru_{0.9}Ga, where Mn atoms occupy two inequivalent sites in the XA-type structure. The effect of a second 200 fs, 800 nm laser pulse that follows the first pump pulse, when both are above the threshold for s...
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| Veröffentlicht in: | Physical review letters 2021-04, Vol.126 (17), p.177202-177202, Article 177202 |
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| container_title | Physical review letters |
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| creator | Banerjee, C Rode, K Atcheson, G Lenne, S Stamenov, P Coey, J M D Besbas, J |
| description | All-optical reswitching has been investigated in the half-metallic Heusler ferrimagnet Mn_{2}Ru_{0.9}Ga, where Mn atoms occupy two inequivalent sites in the XA-type structure. The effect of a second 200 fs, 800 nm laser pulse that follows the first pump pulse, when both are above the threshold for switching, is studied as a function of t_{12}, the time between them. Aims were to determine the minimum time needed for reswitching and to identify the physical mechanisms involved. The time trajectory of the switching process on a plot of sublattice angular momentum, S^{4a} vs S^{4c}, is in three stages; when t10 ps. |
| doi_str_mv | 10.1103/PhysRevLett.126.177202 |
| format | Article |
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The effect of a second 200 fs, 800 nm laser pulse that follows the first pump pulse, when both are above the threshold for switching, is studied as a function of t_{12}, the time between them. Aims were to determine the minimum time needed for reswitching and to identify the physical mechanisms involved. The time trajectory of the switching process on a plot of sublattice angular momentum, S^{4a} vs S^{4c}, is in three stages; when t<0.1 ps, the sublattice moments are rapidly disordered, but not destroyed, while conserving net angular momentum via optical spin-wave excitations. This leads to transient parallel alignment of the residual Mn spins in the first quadrant. 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The effect of a second 200 fs, 800 nm laser pulse that follows the first pump pulse, when both are above the threshold for switching, is studied as a function of t_{12}, the time between them. Aims were to determine the minimum time needed for reswitching and to identify the physical mechanisms involved. The time trajectory of the switching process on a plot of sublattice angular momentum, S^{4a} vs S^{4c}, is in three stages; when t<0.1 ps, the sublattice moments are rapidly disordered, but not destroyed, while conserving net angular momentum via optical spin-wave excitations. This leads to transient parallel alignment of the residual Mn spins in the first quadrant. The net angular momentum associated with the majority sublattice then flips after about 2 ps, and a fully reversed ferrimagnetic state is then established via the spin-lattice interaction, which allows reswitching provided t_{12}>10 ps.</description><subject>Angular momentum</subject><subject>Ferrimagnets</subject><subject>Gallium</subject><subject>Switching</subject><issn>0031-9007</issn><issn>1079-7114</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><recordid>eNpdkMtOAjEUhhujEURfgUzixs1gb3PpyhAUNSGBEFk3baeFIYXBtqPh7S2Cxng2Z_P95_IB0EdwgBAk97PV3s_1x0SHMEA4H6CiwBCfgS6CBUsLhOg56EJIUMogLDrgyvs1hDCi5SXoEMLKkmLUBQ8LG5wwwofksWml1cmstV4nQ2vT6S7USthkrv1nHdSq3i6TxiQiGWvn6o1YbnW4BhdGxMDNqffAYvz0NnpJJ9Pn19Fwkqq4K6SGFkRrhg2VuRE5EyrHklTISAU1zViFoKDmu2g8sZKCKFGVUssSyixTpAfujnN3rnlvtQ98U3ulrRVb3bSe4wyXqISEkYje_kPXTeu28boDRVmWEUIjlR8p5RrvnTZ8d_jJ7TmC_KCY_1HMozd-VByD_dP4Vm509Rv7cUq-AGu7erg</recordid><startdate>20210430</startdate><enddate>20210430</enddate><creator>Banerjee, C</creator><creator>Rode, K</creator><creator>Atcheson, G</creator><creator>Lenne, S</creator><creator>Stamenov, P</creator><creator>Coey, J M D</creator><creator>Besbas, J</creator><general>American Physical Society</general><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7U5</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><scope>7X8</scope><orcidid>https://orcid.org/0000-0001-8379-1589</orcidid><orcidid>https://orcid.org/0000-0001-7045-4583</orcidid><orcidid>https://orcid.org/0000-0003-0053-8452</orcidid></search><sort><creationdate>20210430</creationdate><title>Ultrafast Double Pulse All-Optical Reswitching of a Ferrimagnet</title><author>Banerjee, C ; Rode, K ; Atcheson, G ; Lenne, S ; Stamenov, P ; Coey, J M D ; Besbas, J</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c339t-f473ee92f4b6fa69ac62b3d1fbc0e459d10a4ffffff4268dba3cad8beb80b55c3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2021</creationdate><topic>Angular momentum</topic><topic>Ferrimagnets</topic><topic>Gallium</topic><topic>Switching</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Banerjee, C</creatorcontrib><creatorcontrib>Rode, K</creatorcontrib><creatorcontrib>Atcheson, G</creatorcontrib><creatorcontrib>Lenne, S</creatorcontrib><creatorcontrib>Stamenov, P</creatorcontrib><creatorcontrib>Coey, J M D</creatorcontrib><creatorcontrib>Besbas, J</creatorcontrib><collection>PubMed</collection><collection>CrossRef</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>MEDLINE - Academic</collection><jtitle>Physical review letters</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Banerjee, C</au><au>Rode, K</au><au>Atcheson, G</au><au>Lenne, S</au><au>Stamenov, P</au><au>Coey, J M D</au><au>Besbas, J</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Ultrafast Double Pulse All-Optical Reswitching of a Ferrimagnet</atitle><jtitle>Physical review letters</jtitle><addtitle>Phys Rev Lett</addtitle><date>2021-04-30</date><risdate>2021</risdate><volume>126</volume><issue>17</issue><spage>177202</spage><epage>177202</epage><pages>177202-177202</pages><artnum>177202</artnum><issn>0031-9007</issn><eissn>1079-7114</eissn><abstract>All-optical reswitching has been investigated in the half-metallic Heusler ferrimagnet Mn_{2}Ru_{0.9}Ga, where Mn atoms occupy two inequivalent sites in the XA-type structure. The effect of a second 200 fs, 800 nm laser pulse that follows the first pump pulse, when both are above the threshold for switching, is studied as a function of t_{12}, the time between them. Aims were to determine the minimum time needed for reswitching and to identify the physical mechanisms involved. The time trajectory of the switching process on a plot of sublattice angular momentum, S^{4a} vs S^{4c}, is in three stages; when t<0.1 ps, the sublattice moments are rapidly disordered, but not destroyed, while conserving net angular momentum via optical spin-wave excitations. This leads to transient parallel alignment of the residual Mn spins in the first quadrant. 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| source | American Physical Society Journals; EZB-FREE-00999 freely available EZB journals |
| subjects | Angular momentum Ferrimagnets Gallium Switching |
| title | Ultrafast Double Pulse All-Optical Reswitching of a Ferrimagnet |
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