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Interlayer magnetostatic coupling induced Co layer coercivity enhancement and exchange bias in [Pd/Co]/Cu/Co spin valves
Interlayer stray field coupling in hybrid perpendicular/Cu/in-plane magnetic anisotropy [Pd/Co]/Cu/Co single spin valves and [Pd/Co]/Cu/Co/Cu/[Co/Pd] dual spin valves was investigated. Enhancements of...
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Spin-torque driven ferromagnetic resonance in a nonlinear regime

Appl. Phys. Lett. 95, 172513 (2009); doi:10.1063/1.3254242

Published 30 October 2009

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W. Chen,1 G. de Loubens,1 J.-M. L. Beaujour,1 J. Z. Sun,2 and A. D. Kent1
1Department of Physics, New York University, New York, New York 10003, USA
2IBM T. J. Watson Research Center, Yorktown Heights, New York 10598, USA
Spin-valve based nanojunctions incorporating Co|Ni multilayers with perpendicular anisotropy were used to study spin-torque driven ferromagnetic resonance (ST-FMR) in a nonlinear regime. Perpendicular field swept resonance lines were measured under a large amplitude microwave current excitation, which produces a large angle precession of the Co|Ni layer magnetization. With increasing rf power the resonance lines broaden and become asymmetric, with their peak shifting to lower applied field. A nonhysteretic step jump in ST-FMR voltage signal was also observed at high powers. The results are analyzed in terms of the foldover effect of a forced nonlinear oscillator and compared to macrospin simulations. The ST-FMR nonhysteretic step response may have applications in frequency and amplitude tunable nanoscale field sensors. ©2009 American Institute of Physics
History: Received 14 September 2009; accepted 4 October 2009; published 30 October 2009
Permalink: http://link.aip.org/link/?APPLAB/95/172513/1
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KEYWORDS and PACS

Keywords
PACS
  • 76.50.+g
    Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance
  • 75.70.Cn
    Magnetic properties of interfaces
  • 75.30.Gw
    Magnetic anisotropy
  • YEAR: 2009

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PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
Publisher:
AIP is a member of CrossRef AIP

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