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Applied Physics Letters / Volume 96 / Issue 25 / MAGNETISM AND SUPERCONDUCTIVITY

Appl. Phys. Lett. 96, 252507 (2010); http://dx.doi.org/10.1063/1.3455883 (3 pages)

Two modes behavior of vortex oscillations in spin-transfer nanocontacts subject to in-plane magnetic fields

Michaela Kuepferling1, Claudio Serpico2, Matthew Pufall3, William Rippard3, T. Mitchell Wallis3, Atif Imtiaz3, Pavol Krivosik4, Massimo Pasquale1, and Pavel Kabos3

1National Institute of Metrological Research (INRiM), Torino I-10135, Italy
2University of Naples Federico II, Napoli I-80125, Italy
3National Institute of Standards and Technology (NIST), Boulder, Colorado 80305-3328, USA
4Department of Physics and Energy Science, University of Colorado, Colorado Springs, Colorado 80918, USA

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(Received 15 January 2010; accepted 14 May 2010; published online 25 June 2010)

Vortex oscillations induced by dc currents (Idc) through a metallic nanocontact subject to in-plane magnetic fields (Hext) are studied by measuring voltage power spectra. Two oscillations modes exist: at large Idc the oscillation frequency (fosc) is substantially insensitive to Hext, whereas at low Idc, fosc decreases with Hext increasing. At intermediate Idc the two modes coexist. This behavior is ascribed to the magnetic states of the device ferromagnetic layers: in the first mode vortices are formed in both layers while in the second mode one layer is in a vortex state while the other is in a quasiuniform state.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

ferromagnetic materials, giant magnetoresistance, nanocontacts, nanomagnetics, spin systems, spin valves

PACS

  • 75.70.Cn

    Magnetic properties of interfaces (multilayers, superlattices, heterostructures)

  • 72.15.Gd

    Galvanomagnetic and other magnetotransport effects

  • 75.50.Cc

    Other ferromagnetic metals and alloys

  • 75.75.Lf

    Electronic structure of magnetic nanoparticles

  • 75.47.De

    Giant magnetoresistance

  • 75.75.Fk

    Domain structures in nanoparticles

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3455883

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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