Superconducting switching due to a triplet component in the Pb/Cu/Ni/Cu/Co2Cr1−xFexAly spin-valve structure
We report the superconducting properties of the Co2Cr1−xFexAly/Cu/Ni/Cu/Pb spin-valve structure the magnetic part of which comprises the Heusler alloy layer HA = Co2Cr1−xFexAly with a high degree of spin polarization (DSP) of the conduction band and a Ni layer of variable thickness. The separation b...
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Beilstein-Institut
2019-07-01
|
| Series: | Beilstein Journal of Nanotechnology |
| Subjects: | |
| Online Access: | https://doi.org/10.3762/bjnano.10.144 |
| _version_ | 1818139867125645312 |
|---|---|
| author | Andrey Andreevich Kamashev Nadir Nurgayazovich Garif’yanov Aidar Azatovich Validov Joachim Schumann Vladislav Kataev Bernd Büchner Yakov Victorovich Fominov Ilgiz Abdulsamatovich Garifullin |
| author_facet | Andrey Andreevich Kamashev Nadir Nurgayazovich Garif’yanov Aidar Azatovich Validov Joachim Schumann Vladislav Kataev Bernd Büchner Yakov Victorovich Fominov Ilgiz Abdulsamatovich Garifullin |
| author_sort | Andrey Andreevich Kamashev |
| collection | DOAJ |
| description | We report the superconducting properties of the Co2Cr1−xFexAly/Cu/Ni/Cu/Pb spin-valve structure the magnetic part of which comprises the Heusler alloy layer HA = Co2Cr1−xFexAly with a high degree of spin polarization (DSP) of the conduction band and a Ni layer of variable thickness. The separation between the superconducting transition curves measured for the parallel (α = 0°) and perpendicular (α = 90°) orientation of the magnetization of the HA and the Ni layers reaches up to 0.5 K (α is the angle between the magnetization of two ferromagnetic layers). For all studied samples the dependence of the superconducting transition temperature Tc on α demonstrates a deep minimum in the vicinity of the perpendicular configuration of the magnetizations. This suggests that the observed minimum and the corresponding full switching effect of the spin valve is caused by the long-range triplet component of the superconducting condensate in the multilayer. Such a large effect can be attributed to a half-metallic nature of the HA layer, which in the orthogonal configuration efficiently draws off the spin-polarized Cooper pairs from the space between the HA and Ni layers. Our results indicate a significant potential of the concept of a superconducting spin-valve multilayer comprising a half-metallic ferromagnet, recently proposed by A. Singh et al., Phys. Rev. X 2015, 5, 021019, in achieving large values of the switching effect. |
| first_indexed | 2024-12-11T10:34:54Z |
| format | Article |
| id | doaj.art-adf38fb655b0432098daac63d3ae39bf |
| institution | Directory Open Access Journal |
| issn | 2190-4286 |
| language | English |
| last_indexed | 2024-12-11T10:34:54Z |
| publishDate | 2019-07-01 |
| publisher | Beilstein-Institut |
| record_format | Article |
| series | Beilstein Journal of Nanotechnology |
| spelling | doaj.art-adf38fb655b0432098daac63d3ae39bf2022-12-22T01:10:44ZengBeilstein-InstitutBeilstein Journal of Nanotechnology2190-42862019-07-011011458146310.3762/bjnano.10.1442190-4286-10-144Superconducting switching due to a triplet component in the Pb/Cu/Ni/Cu/Co2Cr1−xFexAly spin-valve structureAndrey Andreevich Kamashev0Nadir Nurgayazovich Garif’yanov1Aidar Azatovich Validov2Joachim Schumann3Vladislav Kataev4Bernd Büchner5Yakov Victorovich Fominov6Ilgiz Abdulsamatovich Garifullin7Zavoisky Physical-Technical Institute, FRC Kazan Scientific Center of RAS, 420029 Kazan, RussiaZavoisky Physical-Technical Institute, FRC Kazan Scientific Center of RAS, 420029 Kazan, RussiaZavoisky Physical-Technical Institute, FRC Kazan Scientific Center of RAS, 420029 Kazan, RussiaLeibniz Institute for Solid State and Materials Research IFW Dresden, 01069 Dresden, GermanyLeibniz Institute for Solid State and Materials Research IFW Dresden, 01069 Dresden, GermanyLeibniz Institute for Solid State and Materials Research IFW Dresden, 01069 Dresden, GermanyL. D. Landau Institute for Theoretical Physics RAS, 142432 Chernogolovka, RussiaZavoisky Physical-Technical Institute, FRC Kazan Scientific Center of RAS, 420029 Kazan, RussiaWe report the superconducting properties of the Co2Cr1−xFexAly/Cu/Ni/Cu/Pb spin-valve structure the magnetic part of which comprises the Heusler alloy layer HA = Co2Cr1−xFexAly with a high degree of spin polarization (DSP) of the conduction band and a Ni layer of variable thickness. The separation between the superconducting transition curves measured for the parallel (α = 0°) and perpendicular (α = 90°) orientation of the magnetization of the HA and the Ni layers reaches up to 0.5 K (α is the angle between the magnetization of two ferromagnetic layers). For all studied samples the dependence of the superconducting transition temperature Tc on α demonstrates a deep minimum in the vicinity of the perpendicular configuration of the magnetizations. This suggests that the observed minimum and the corresponding full switching effect of the spin valve is caused by the long-range triplet component of the superconducting condensate in the multilayer. Such a large effect can be attributed to a half-metallic nature of the HA layer, which in the orthogonal configuration efficiently draws off the spin-polarized Cooper pairs from the space between the HA and Ni layers. Our results indicate a significant potential of the concept of a superconducting spin-valve multilayer comprising a half-metallic ferromagnet, recently proposed by A. Singh et al., Phys. Rev. X 2015, 5, 021019, in achieving large values of the switching effect.https://doi.org/10.3762/bjnano.10.144ferromagnetproximity effectsuperconductor |
| spellingShingle | Andrey Andreevich Kamashev Nadir Nurgayazovich Garif’yanov Aidar Azatovich Validov Joachim Schumann Vladislav Kataev Bernd Büchner Yakov Victorovich Fominov Ilgiz Abdulsamatovich Garifullin Superconducting switching due to a triplet component in the Pb/Cu/Ni/Cu/Co2Cr1−xFexAly spin-valve structure Beilstein Journal of Nanotechnology ferromagnet proximity effect superconductor |
| title | Superconducting switching due to a triplet component in the Pb/Cu/Ni/Cu/Co2Cr1−xFexAly spin-valve structure |
| title_full | Superconducting switching due to a triplet component in the Pb/Cu/Ni/Cu/Co2Cr1−xFexAly spin-valve structure |
| title_fullStr | Superconducting switching due to a triplet component in the Pb/Cu/Ni/Cu/Co2Cr1−xFexAly spin-valve structure |
| title_full_unstemmed | Superconducting switching due to a triplet component in the Pb/Cu/Ni/Cu/Co2Cr1−xFexAly spin-valve structure |
| title_short | Superconducting switching due to a triplet component in the Pb/Cu/Ni/Cu/Co2Cr1−xFexAly spin-valve structure |
| title_sort | superconducting switching due to a triplet component in the pb cu ni cu co2cr1 xfexaly spin valve structure |
| topic | ferromagnet proximity effect superconductor |
| url | https://doi.org/10.3762/bjnano.10.144 |
| work_keys_str_mv | AT andreyandreevichkamashev superconductingswitchingduetoatripletcomponentinthepbcunicuco2cr1xfexalyspinvalvestructure AT nadirnurgayazovichgarifyanov superconductingswitchingduetoatripletcomponentinthepbcunicuco2cr1xfexalyspinvalvestructure AT aidarazatovichvalidov superconductingswitchingduetoatripletcomponentinthepbcunicuco2cr1xfexalyspinvalvestructure AT joachimschumann superconductingswitchingduetoatripletcomponentinthepbcunicuco2cr1xfexalyspinvalvestructure AT vladislavkataev superconductingswitchingduetoatripletcomponentinthepbcunicuco2cr1xfexalyspinvalvestructure AT berndbuchner superconductingswitchingduetoatripletcomponentinthepbcunicuco2cr1xfexalyspinvalvestructure AT yakovvictorovichfominov superconductingswitchingduetoatripletcomponentinthepbcunicuco2cr1xfexalyspinvalvestructure AT ilgizabdulsamatovichgarifullin superconductingswitchingduetoatripletcomponentinthepbcunicuco2cr1xfexalyspinvalvestructure |