Landau-Zener and Rabi oscillations in the spin-dependent conductance
We describe the spin-dependent quantum conductance in a wire where a magnetic eld is spatially modulated. The change in direction and intensity of the magnetic eld acts as aperturbation that mixes spin projections. This is exempli ed by a ferromagnetic nanowire. Therethe local eld varies smoothly it...
| Authors: | ; |
|---|---|
| Format: | Article |
| Status: | Published version |
| Publication date: | 2014 |
| Country: | Argentina |
| Institution: | Consejo Nacional de Investigaciones Científicas y Técnicas |
| Repository: | CONICET Digital (CONICET) |
| Language: | English |
| OAI Identifier: | oai:ri.conicet.gov.ar:11336/31829 |
| Online Access: | http://hdl.handle.net/11336/31829 |
| Access Level: | Open access |
| Keyword: | Spin polarized transport Magnetoelectronics spintronics https://purl.org/becyt/ford/1.3 https://purl.org/becyt/ford/1 |
| _version_ | 1878403150480670720 |
|---|---|
| author | Fernández, Lucas Jonatan |
| author2 | Pastawski, Horacio Miguel |
| author2_role | author |
| author_browse | Fernández, Lucas Jonatan Pastawski, Horacio Miguel |
| author_facet | Fernández, Lucas Jonatan Pastawski, Horacio Miguel |
| author_role | author |
| collection | CONICET Digital (CONICET) |
| description | We describe the spin-dependent quantum conductance in a wire where a magnetic eld is spatially modulated. The change in direction and intensity of the magnetic eld acts as aperturbation that mixes spin projections. This is exempli ed by a ferromagnetic nanowire. Therethe local eld varies smoothly its direction generating a domain wall (DW) as described by thewell-known Cabrera-Falicov model. Here, we generalize this model to include also a strength mod-ulation. We identify two striking diabatic regimes that appear when such magnetic inhogeneityoccurs. 1) If the eld strength at the DW is weak enough, the local Zeeman energies result in anavoided crossing. Thus, the spin- ip probability follows the Landau-Zener formula. 2) For strong elds, the spin-dependent conductance shows oscillations as a function of the DW width. Weinterpret them in terms of Rabi oscillations. Time and length scales obtained from this simpli edview show an excellent agreement with the exact dynamical solution of the spin-dependent trans-port. These results remain valid for other situations involving modulated magnetic structures andthus they open new prospects for the use of quantum interferences in spin-based devices. |
| eu_rights_str_mv | openAccess |
| format | article |
| id | AR_47790a3c8f9f76331d4dcaed8d1df2fa |
| identifier_str_mv | Pastawski, Horacio Miguel; Fernández, Lucas Jonatan; Landau-Zener and Rabi oscillations in the spin-dependent conductance; Europhysics Letters; Europhysics Letters; 105; 1-2014; 17005-17011 0295-5075 CONICET Digital CONICET |
| institution | Consejo Nacional de Investigaciones Científicas y Técnicas |
| instname_str | Consejo Nacional de Investigaciones Científicas y Técnicas |
| language | eng |
| network_acronym_str | AR |
| network_name_str | Argentina |
| oai_identifier_str | oai:ri.conicet.gov.ar:11336/31829 |
| publishDate | 2014 |
| publishDateSort | 2014 |
| publisher | Europhysics Letters |
| publisherStr | Europhysics Letters |
| reponame_str | CONICET Digital (CONICET) |
| spelling | Landau-Zener and Rabi oscillations in the spin-dependent conductance Fernández, Lucas Jonatan Pastawski, Horacio Miguel Spin polarized transport Magnetoelectronics spintronics https://purl.org/becyt/ford/1.3 https://purl.org/becyt/ford/1 We describe the spin-dependent quantum conductance in a wire where a magnetic eld is spatially modulated. The change in direction and intensity of the magnetic eld acts as aperturbation that mixes spin projections. This is exempli ed by a ferromagnetic nanowire. Therethe local eld varies smoothly its direction generating a domain wall (DW) as described by thewell-known Cabrera-Falicov model. Here, we generalize this model to include also a strength mod-ulation. We identify two striking diabatic regimes that appear when such magnetic inhogeneityoccurs. 1) If the eld strength at the DW is weak enough, the local Zeeman energies result in anavoided crossing. Thus, the spin- ip probability follows the Landau-Zener formula. 2) For strong elds, the spin-dependent conductance shows oscillations as a function of the DW width. Weinterpret them in terms of Rabi oscillations. Time and length scales obtained from this simpli edview show an excellent agreement with the exact dynamical solution of the spin-dependent trans-port. These results remain valid for other situations involving modulated magnetic structures andthus they open new prospects for the use of quantum interferences in spin-based devices. Fil: Fernández, Lucas Jonatan. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Física Enrique Gaviola. Universidad Nacional de Córdoba. Instituto de Física Enrique Gaviola; Argentina. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentina Fil: Pastawski, Horacio Miguel. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Física Enrique Gaviola. Universidad Nacional de Córdoba. Instituto de Física Enrique Gaviola; Argentina Europhysics Letters http://hdl.handle.net/11336/31829 Pastawski, Horacio Miguel; Fernández, Lucas Jonatan; Landau-Zener and Rabi oscillations in the spin-dependent conductance; Europhysics Letters; Europhysics Letters; 105; 1-2014; 17005-17011 0295-5075 CONICET Digital CONICET |
| spellingShingle | Landau-Zener and Rabi oscillations in the spin-dependent conductance Fernández, Lucas Jonatan Spin polarized transport Magnetoelectronics spintronics https://purl.org/becyt/ford/1.3 https://purl.org/becyt/ford/1 |
| status_str | publishedVersion |
| title | Landau-Zener and Rabi oscillations in the spin-dependent conductance |
| title_full | Landau-Zener and Rabi oscillations in the spin-dependent conductance |
| title_fullStr | Landau-Zener and Rabi oscillations in the spin-dependent conductance |
| title_full_unstemmed | Landau-Zener and Rabi oscillations in the spin-dependent conductance |
| title_short | Landau-Zener and Rabi oscillations in the spin-dependent conductance |
| title_sort | Landau-Zener and Rabi oscillations in the spin-dependent conductance |
| topic | Spin polarized transport Magnetoelectronics spintronics https://purl.org/becyt/ford/1.3 https://purl.org/becyt/ford/1 |
| topic_facet | Spin polarized transport Magnetoelectronics spintronics https://purl.org/becyt/ford/1.3 https://purl.org/becyt/ford/1 |
| url | http://hdl.handle.net/11336/31829 |