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Event 

Title:
Wei Chen (PUC-Rio): In-plane current induced spin torque in metal/ferromagnet bilayers
When:
05.04.2018 11.00 h
Where:
Sala 429 (torre nova) - Niterói
Categoría:
Seminários

Description

Seminário de Física da Matéria Condensada

 

05/04 - 5a feira - 11h00
Sala 429 - 4o andar da torre nova

Palestrante:  Wei Chen (PUC)

Título: Theory of in-plane current induced spin torque in metal/ferromagnet bilayers

Resumo:
The current induced spin torque has been a major topic in thin film spintronics, due to its tremendous applications in magnetic memory devices with low power consumption. Recently, it is discovered that the spin Hall effect in the current-in-plane geometry can be used to generate a spin torque in prototype metal/ferromagnet bilayer thin films, such as Pt/Co or Ta/Co of about 10nm thickness. Despite the simplicity of these thin films, the precise description for the experimentally observed spin torque actually involves a variety of complicatedly intertwined mechanisms. I will present a theory that incorporates both the spin Hall effect spin transfer torque (SHE-STT) due to SHE-induced spin injection, and the spin-orbit torque (SOT) due to spin-orbit coupling induced spin accumulation. In particular, we uncover that the SHE induced spin voltage and the interface spin current are mutually dependent, hence are solved in a self-consistent manner.
In addition, the spin transport mediated by the quantum well states may be responsible for the experimentally observed rapid variation of the spin torque with respect to the thickness of the ferromagnet.

http://nano.if.uff.br/wiki/doku.php?id=wei-chen2018

 

Venue

Map
Grupo:
Sala 429 (torre nova)
Street:
Av. Gal. Milton Tavares de Sousa s/n
ZIP:
2421-346
City:
Niterói
State:
RJ
Country:
Country: br

Description

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