A magnetoelectronic device is proposed in which a spin-current pulse produces a rapid reversal of the magnetization of a thin film nanomagnet. A spin-transfer torque induces the reversal and the switching speed is determined by the precession frequency of the magnetization in a thin film element’s demagnetization field. Micromagnetic simulations show that this switching occurs above a threshold pulse current and can be faster than 50 ps. In contrast to present spin-transfer devices, the switching does not require an initial fluctuation or deviation of magnetic layers from collinear alignment and is far more energy efficient. This device operates at room temperature and can be realized with present-day magnetic nanostructure technology.
REFERENCES
1.
2.
3.
J. A.
Katine
, F. J.
Albert
, R. A.
Buhrman
, E. B.
Myers
, and D. C.
Ralph
, Phys. Rev. Lett.
84
, 3149
(2000
).4.
J.
Grollier
, V.
Cros
, H.
Jaffres
, A.
Hamzic
, J. M.
George
, G.
Faini
, J.
Ben Youssef
, H.
Le Gall
, and A.
Fert
, Phys. Rev. B
67
, 174402
(2003
).5.
B.
Özyilmaz
, A. D.
Kent
, D.
Monsma
, J. Z.
Sun
, M. J.
Rooks
, and R. H.
Koch
, Phys. Rev. Lett.
91
, 067203
(2003
).6.
J. E.
Wegrowe
, D.
Kelly
, T.
Truong
, P.
Guittienne
, and J. P.
Ansermet
, Europhys. Lett.
56
, 748
(2001
).7.
8.
R. H.
Koch
, J. A.
Katine
, and J. Z.
Sun
, Phys. Rev. Lett.
92
, 088302
(2004
).9.
A. D. Kent, B. Özyilmaz, and E. del Barco, patent pending (2004).
10.
Although from these considerations switching in lower magnetization density materials, such as magnetic semiconductors, is slower, these materials are attractive because they would have lower current switching thresholds and in magnetic semiconductors the device resistances would be larger.
11.
Y. B.
Bazaliy
, B. A.
Jones
, and S. C.
Zhang
, J. Appl. Phys.
89
, 6793
(2001
).12.
13.
D.
Weller
, L.
Folks
, M.
Best
, E. E.
Fullerton
, B. D.
Terris
, G. J.
Kusinski
, K. M.
Krishnan
, and G.
Thomas
, J. Appl. Phys.
89
, 7525
(2001
).14.
15.
J. C. Slonczewski, Patent 5,695,864 (1997).
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2004
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