Spin-orbit torque-induced switching in ferrimagnetic alloys: Experiments and modeling
We investigate spin-orbit torque (SOT)-induced switching in rare-earth-transition metal ferrimagnetic alloys using W/CoTb bilayers. The switching current is found to vary continuously with the alloy concentration, and no reduction in the switching current is observed at the magnetic compensation poi...
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| Veröffentlicht in: | Applied physics letters 2018-02, Vol.112 (6), p.62401-62401 |
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| creator | Je, Soong-Geun Rojas-Sánchez, Juan-Carlos Pham, Thai Ha Vallobra, Pierre Malinowski, Gregory Lacour, Daniel Fache, Thibaud Cyrille, Marie-Claire Kim, Dae-Yun Choe, Sug-Bong Belmeguenai, Mohamed Hehn, Michel Mangin, Stéphane Gaudin, Gilles Boulle, Olivier |
| description | We investigate spin-orbit torque (SOT)-induced switching in rare-earth-transition metal ferrimagnetic alloys using W/CoTb bilayers. The switching current is found to vary continuously with the alloy concentration, and no reduction in the switching current is observed at the magnetic compensation point despite a very large SOT efficiency. A model based on coupled Landau-Lifschitz-Gilbert (LLG) equations shows that the switching current density scales with the effective perpendicular anisotropy which does not exhibit strong reduction at the magnetic compensation, explaining the behavior of the switching current density. This model also suggests that conventional SOT effective field measurements do not allow one to conclude whether the spins are transferred to one sublattice or just simply to the net magnetization. The effective spin Hall angle measurement shows an enhancement of the spin Hall angle with the Tb concentration which suggests an additional SOT contribution from the rare earth Tb atoms. |
| doi_str_mv | 10.1063/1.5017738 |
| format | Article |
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The switching current is found to vary continuously with the alloy concentration, and no reduction in the switching current is observed at the magnetic compensation point despite a very large SOT efficiency. A model based on coupled Landau-Lifschitz-Gilbert (LLG) equations shows that the switching current density scales with the effective perpendicular anisotropy which does not exhibit strong reduction at the magnetic compensation, explaining the behavior of the switching current density. This model also suggests that conventional SOT effective field measurements do not allow one to conclude whether the spins are transferred to one sublattice or just simply to the net magnetization. The effective spin Hall angle measurement shows an enhancement of the spin Hall angle with the Tb concentration which suggests an additional SOT contribution from the rare earth Tb atoms.</description><identifier>ISSN: 0003-6951</identifier><identifier>EISSN: 1077-3118</identifier><identifier>DOI: 10.1063/1.5017738</identifier><identifier>CODEN: APPLAB</identifier><language>eng</language><publisher>Melville: American Institute of Physics</publisher><subject>Anisotropy ; Applied physics ; Compensation ; Condensed Matter ; Current density ; Ferrimagnetism ; Physics ; Rare earth alloys ; Reduction ; Switching ; Torque ; Transition metal alloys</subject><ispartof>Applied physics letters, 2018-02, Vol.112 (6), p.62401-62401</ispartof><rights>Author(s)</rights><rights>2018 Author(s). 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The switching current is found to vary continuously with the alloy concentration, and no reduction in the switching current is observed at the magnetic compensation point despite a very large SOT efficiency. A model based on coupled Landau-Lifschitz-Gilbert (LLG) equations shows that the switching current density scales with the effective perpendicular anisotropy which does not exhibit strong reduction at the magnetic compensation, explaining the behavior of the switching current density. This model also suggests that conventional SOT effective field measurements do not allow one to conclude whether the spins are transferred to one sublattice or just simply to the net magnetization. The effective spin Hall angle measurement shows an enhancement of the spin Hall angle with the Tb concentration which suggests an additional SOT contribution from the rare earth Tb atoms.</description><subject>Anisotropy</subject><subject>Applied physics</subject><subject>Compensation</subject><subject>Condensed Matter</subject><subject>Current density</subject><subject>Ferrimagnetism</subject><subject>Physics</subject><subject>Rare earth alloys</subject><subject>Reduction</subject><subject>Switching</subject><subject>Torque</subject><subject>Transition metal alloys</subject><issn>0003-6951</issn><issn>1077-3118</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2018</creationdate><recordtype>article</recordtype><recordid>eNp9kEtLAzEUhYMoWB8L_8GAK4XRPCaPcSelPqDgQrsOaSbRlGkyJqmPf29Ki10Iri738N3DuQeAMwSvEGTkGl1RiDgnYg-MEOS8JgiJfTCCEJKatRQdgqOUFmWlmJARmD0Pztchzl2ucojvK1M736206ar06bJ-c_61cr6yJka3VK_eZKcr1ffhO91Uk6_BFNn4nCrlu2oZOtOXixNwYFWfzOl2HoPZ3eRl_FBPn-4fx7fTWjcM51oRhjluG4uEZoQ1VsyZaAgRVLScNsoyo-ccQ0ysEVq1vMWs0xgrzJC2kJJjcLHxfVO9HNYB47cMysmH26lca6UL1lAqPlBhzzfsEEN5M2W5CKvoSzyJEaICMt60O0cdQ0rR2F9bBOW6YYnktuHCXm7YpF1W2QX_C3-EuAPl0Nn_4L_OP7KHiDM</recordid><startdate>20180205</startdate><enddate>20180205</enddate><creator>Je, Soong-Geun</creator><creator>Rojas-Sánchez, Juan-Carlos</creator><creator>Pham, Thai Ha</creator><creator>Vallobra, Pierre</creator><creator>Malinowski, Gregory</creator><creator>Lacour, Daniel</creator><creator>Fache, Thibaud</creator><creator>Cyrille, Marie-Claire</creator><creator>Kim, Dae-Yun</creator><creator>Choe, Sug-Bong</creator><creator>Belmeguenai, Mohamed</creator><creator>Hehn, Michel</creator><creator>Mangin, Stéphane</creator><creator>Gaudin, Gilles</creator><creator>Boulle, Olivier</creator><general>American Institute of Physics</general><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><scope>1XC</scope><scope>VOOES</scope><orcidid>https://orcid.org/0000-0001-7044-2785</orcidid><orcidid>https://orcid.org/0000-0001-6046-0437</orcidid><orcidid>https://orcid.org/0000-0002-5940-8436</orcidid><orcidid>https://orcid.org/0000-0002-8538-7907</orcidid><orcidid>https://orcid.org/0000-0002-2395-1146</orcidid><orcidid>https://orcid.org/0000-0002-4240-5925</orcidid><orcidid>https://orcid.org/0000-0003-1469-7438</orcidid><orcidid>https://orcid.org/0000-0002-5871-8870</orcidid><orcidid>https://orcid.org/0000-0002-1276-0635</orcidid></search><sort><creationdate>20180205</creationdate><title>Spin-orbit torque-induced switching in ferrimagnetic alloys: Experiments and modeling</title><author>Je, Soong-Geun ; Rojas-Sánchez, Juan-Carlos ; Pham, Thai Ha ; Vallobra, Pierre ; Malinowski, Gregory ; Lacour, Daniel ; Fache, Thibaud ; Cyrille, Marie-Claire ; Kim, Dae-Yun ; Choe, Sug-Bong ; Belmeguenai, Mohamed ; Hehn, Michel ; Mangin, Stéphane ; Gaudin, Gilles ; Boulle, Olivier</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c462t-a3627294f18c6364f8b684338589754af6ecb72023fe8ca97926dc22a261cf053</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2018</creationdate><topic>Anisotropy</topic><topic>Applied physics</topic><topic>Compensation</topic><topic>Condensed Matter</topic><topic>Current density</topic><topic>Ferrimagnetism</topic><topic>Physics</topic><topic>Rare earth alloys</topic><topic>Reduction</topic><topic>Switching</topic><topic>Torque</topic><topic>Transition metal alloys</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Je, Soong-Geun</creatorcontrib><creatorcontrib>Rojas-Sánchez, Juan-Carlos</creatorcontrib><creatorcontrib>Pham, Thai Ha</creatorcontrib><creatorcontrib>Vallobra, Pierre</creatorcontrib><creatorcontrib>Malinowski, Gregory</creatorcontrib><creatorcontrib>Lacour, Daniel</creatorcontrib><creatorcontrib>Fache, Thibaud</creatorcontrib><creatorcontrib>Cyrille, Marie-Claire</creatorcontrib><creatorcontrib>Kim, Dae-Yun</creatorcontrib><creatorcontrib>Choe, Sug-Bong</creatorcontrib><creatorcontrib>Belmeguenai, Mohamed</creatorcontrib><creatorcontrib>Hehn, Michel</creatorcontrib><creatorcontrib>Mangin, Stéphane</creatorcontrib><creatorcontrib>Gaudin, Gilles</creatorcontrib><creatorcontrib>Boulle, Olivier</creatorcontrib><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Hyper Article en Ligne (HAL)</collection><collection>Hyper Article en Ligne (HAL) (Open Access)</collection><jtitle>Applied physics letters</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Je, Soong-Geun</au><au>Rojas-Sánchez, Juan-Carlos</au><au>Pham, Thai Ha</au><au>Vallobra, Pierre</au><au>Malinowski, Gregory</au><au>Lacour, Daniel</au><au>Fache, Thibaud</au><au>Cyrille, Marie-Claire</au><au>Kim, Dae-Yun</au><au>Choe, Sug-Bong</au><au>Belmeguenai, Mohamed</au><au>Hehn, Michel</au><au>Mangin, Stéphane</au><au>Gaudin, Gilles</au><au>Boulle, Olivier</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Spin-orbit torque-induced switching in ferrimagnetic alloys: Experiments and modeling</atitle><jtitle>Applied physics letters</jtitle><date>2018-02-05</date><risdate>2018</risdate><volume>112</volume><issue>6</issue><spage>62401</spage><epage>62401</epage><pages>62401-62401</pages><issn>0003-6951</issn><eissn>1077-3118</eissn><coden>APPLAB</coden><abstract>We investigate spin-orbit torque (SOT)-induced switching in rare-earth-transition metal ferrimagnetic alloys using W/CoTb bilayers. The switching current is found to vary continuously with the alloy concentration, and no reduction in the switching current is observed at the magnetic compensation point despite a very large SOT efficiency. A model based on coupled Landau-Lifschitz-Gilbert (LLG) equations shows that the switching current density scales with the effective perpendicular anisotropy which does not exhibit strong reduction at the magnetic compensation, explaining the behavior of the switching current density. This model also suggests that conventional SOT effective field measurements do not allow one to conclude whether the spins are transferred to one sublattice or just simply to the net magnetization. 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| source | AIP Journals Complete; Alma/SFX Local Collection |
| subjects | Anisotropy Applied physics Compensation Condensed Matter Current density Ferrimagnetism Physics Rare earth alloys Reduction Switching Torque Transition metal alloys |
| title | Spin-orbit torque-induced switching in ferrimagnetic alloys: Experiments and modeling |
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