Torque due to spin-polarized current in ferromagnetic single-electron transistors with non-collinear magnetizations

Justyna Wiśniewska 1Małgorzata Kowalik 1Józef Barnaś 1,2

1. Adam Mickiewicz University, Department of Physics, Umultowska 85, Poznań 61-614, Poland
2. Polish Academy of Sciences, Institute of Molecular Physics, Mariana Smoluchowskiego 17, Poznań 60-179, Poland


Transport of spin-polarized electrons in a ferromagnetic single-electron transistor (FM SET) is analyzed theoretically in the sequential tunneling regime [1]. Two external electrodes and the central part (island) of the device under consideration are ferromagnetic, with the corresponding magnetizations being generally non-collinear. The regimes of fast and slow spin relaxations on the island are considered. Transport characteristics like conductance, tunnel magnetoresistance (TMR), and differential conductance have been calculated for different values of the bias and gate voltages. It is shown that the transport characteristics vary significantly with the angle between magnetizations [2]. We have also calculated torque due to spin transfer from conduction electrons to localized magnetic moments. The torque is calculated from the spin current absorbed by the island [3].

[1] Single Charge Tunneling, Vol. 294 of NATO Advanced Study Institute, Series B, edited by H. Grabert and M. H. Devoret (Plenum Press, New York, 1992).
[2] J. Wiśniewska, I. Weymann and J. Barnaś, Materials Science (Poland) 22, 461 (2004), and references therein.
[3] J. Barnaś, A. Fert, M. Gmitra, I. Weymann and V. Dugaev, cond-mat/0501570

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Presentation: poster at E-MRS Fall Meeting 2005, Symposium D, by Justyna Wiśniewska
See On-line Journal of E-MRS Fall Meeting 2005

Submitted: 2005-05-23 13:16
Revised:   2009-06-07 00:44
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