Strong linewidth variation for spin-torque nano-oscillators as a function of in-plane magnetic field angle

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K. V. Thadani,¹ G. Finocchio,² Z.-P. Li,¹ O. Ozatay,¹ J. C. Sankey,¹ I. N. Krivorotov,³ Y.-T. Cui,¹ R. A. Buhrman,¹ and D. C. Ralph¹
¹Cornell University, Ithaca, New York 14853, USA
²Dipartimento di Fisica della Materia e Tecnologie Fisiche Avanzate, University of Messina, Salita Sperone 31, 98166 Messina, Italy
³Department of Physics and Astronomy, University of California, Irvine, California 92697, USA

Received 2 June 2008; published 14 July 2008

Wemeasure the microwave signals produced by spin-torque-driven magnetization dynamics excitedby direct currents in patterned magnetic multilayer devices at roomtemperature as a function of the angle of a magneticfield applied in the sample plane. We find strong variationsin the frequency linewidth of the signals, with a decreaseby more than a factor of 20 as the fieldis rotated from the magnetic easy axis to the in-planehard axis. Based on micromagnetic simulations, we identify these variationsas due to a transition from spatially incoherent to coherentprecession.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.78.024409
DOI:	10.1103/PhysRevB.78.024409
PACS:	75.75.+a; 72.25.-b; 76.50.+g 75.75.+a Magnetic properties of nanostructures 72.25.-b Spin polarized transport 76.50.+g Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance YEAR: 2008
KEYWORDS:	ferromagnetic resonance, magnetic microwave devices, magnetic multilayers, magnetisation, magnetoelectronics, micromagnetics, oscillators, spin polarised transport

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