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7 Feb 2011

Volume 98, Issue 6, Articles (06xxxx)

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Appl. Phys. Lett. 98, 063101 (2011); http://dx.doi.org/10.1063/1.3551574 (3 pages)

Y. Z. He, H. Li, P. C. Si, Y. F. Li, H. Q. Yu, X. Q. Zhang, F. Ding, K. M. Liew, and X. F. Liu
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Dynamics of two coupled vortices in a spin valve nanopillar excited by spin transfer torque

N. Locatelli, V. V. Naletov, J. Grollier, G. de Loubens, V. Cros, C. Deranlot, C. Ulysse, G. Faini, O. Klein, and A. Fert

Appl. Phys. Lett. 98, 062501 (2011); http://dx.doi.org/10.1063/1.3553771 (3 pages) | Cited 16 times

Online Publication Date: 7 February 2011

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We investigate the dynamics of two coupled vortices driven by spin transfer. We are able to independently control with current and perpendicular field and to detect the respective chiralities and polarities of the two vortices. For current densities above J = 5.7×107 A/cm2, a highly coherent signal (linewidth down to 46 kHz) can be observed, with a strong dependence on the relative polarities of the vortices. It demonstrates the interest of using coupled dynamics in order to increase the coherence of the microwave signal. Emissions exhibit a linear frequency evolution with perpendicular field, with coherence conserved even at zero magnetic field.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
78.70.Gq Microwave and radio-frequency interactions
75.50.Tt Fine-particle systems; nanocrystalline materials
75.75.-c Magnetic properties of nanostructures
73.40.Jn Metal-to-metal contacts
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