Thermal spin transport effects and long-range magnetic coupling in Co/Nb/Co trilayers
Spin manipulation and transport has been a widely studied topic for the opportunities it presents to the data storage industry. With an array of different methods ranging from spin wave optimization and control of magnetoresistance up to the transport of spins with heat and even sound, the possibili...
- Autores:
-
González Sánchez, Víctor Hugo
- Tipo de recurso:
- Fecha de publicación:
- 2020
- Institución:
- Universidad de los Andes
- Repositorio:
- Séneca: repositorio Uniandes
- Idioma:
- eng
- OAI Identifier:
- oai:repositorio.uniandes.edu.co:1992/48574
- Acceso en línea:
- http://hdl.handle.net/1992/48574
- Palabra clave:
- Espintrónica
Magnetorresistencia
Magnetismo
Física
- Rights
- openAccess
- License
- http://creativecommons.org/licenses/by-nc-sa/4.0/
| Summary: | Spin manipulation and transport has been a widely studied topic for the opportunities it presents to the data storage industry. With an array of different methods ranging from spin wave optimization and control of magnetoresistance up to the transport of spins with heat and even sound, the possibilities seem endless. In this work, we grow and study magnetically and thermally induced changes in resistance in textured Co/Nb/Co trilayers. Using anisotropic magnetoresistance (AMR) and cryogenic magnetoresistance we are able to study the interaction and transport properties of the spins within the ferromagnetic (FM) layers in the presence of an external magnetic field. We found a long-range exchange coupling between the magnetic moments of the Co layers as far as 10 nm. We also found that this coupling depends on the separation of the layers (i.e. the thickness of the Nb layer) and is a non-monotonic decreasing function of that separation. This behavior is expected if there is interlayer exchange coupling (IEC). The magnetic polarization within the sample is affected by this coupling as well. It is studied using two different, complimentary, methods: vibrating sample magnetometer (VSM) and magneto-optic Kerr effect (Moke). We found that the shape of the hysteresis curves also reflect the presence of IEC. Furthermore, we studied the influence of temperature on this behavior and found Hall and Nernst effects just as predicted by previous works. Both of these facts point towards a strongly coupled interaction that can be exploited for spin transport applications as well as finely tuned magnetic sensors |
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