jap banner
  • Volume/Page
  • Keyword
  • DOI
  • Citation
  • Advanced
   
 
 
 

Flickr Twitter UniPHY Group iResearch App Facebook

Journal of Applied Physics / Volume 110 / Issue 12 / ARTICLES / Magnetism and Superconductivity

J. Appl. Phys. 110, 123913 (2011); http://dx.doi.org/10.1063/1.3671632 (6 pages)

Hysteretic spin-wave excitation in spin-torque oscillators as a function of the in-plane field angle: A micromagnetic description

G. Finocchio1, A. Prattella1, G. Consolo2, E. Martinez3, A. Giordano1, and B. Azzerboni1

1Dipartimento di Fisica della Materia e Ingegneria Elettronica, University of Messina, Salita Sperone 31, 98166 Messina, Italy
2Dipartimento di Scienze per l’Ingegneria e l’Architettura, University of Messina, C.da di Dio, 98166 Messina, Italy
3Departamento de Fisica Aplicada, University of Salamanca, Plaza de la Merced s/n, 37008 Salamanca, Spain

View MapView Map

(Received 8 September 2011; accepted 18 November 2011; published online 23 December 2011)

This paper describes a full micromagnetic characterization of the magnetization dynamics driven by spin-polarized current in anisotropic spin-torque oscillators (STOs). For field angles approaching the hard in-plane axis, the excited mode is uniform and a super-critical Hopf-bifurcation takes place at the critical current density JC. For field angles close to the easy axis of the free layer, the excited mode is localized (non-uniform) and a sub-critical Hopf-bifurcation occurs at JC. In this latter region, a hysteretic behaviour is, therefore, found. We demonstrate numerically that the non-linearities of the STO are strongly reduced when the oscillation frequency at the critical current is near the ferromagnetic resonance (FMR) frequency computed at zero bias current, and in particular, this condition corresponds to the field orientation at which a minimum in the FMR-frequency is achieved.

© 2011 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. NUMERICAL MODEL
  3. RESULTS AND DISCUSSIONS

RELATED DATABASES

To view database links for this article, you need to log in.

KEYWORDS and PACS

Keywords

bifurcation, ferromagnetic resonance, localised modes, magnetic anisotropy, magnetic hysteresis, micromagnetics, spin polarised transport

PACS

  • 76.50.+g

    Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance

  • 75.78.-n

    Magnetization dynamics

  • 72.25.-b

    Spin polarized transport

  • 75.30.Gw

    Magnetic anisotropy

  • 75.60.Ej

    Magnetization curves, hysteresis, Barkhausen and related effects

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3671632

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (online)

Publisher

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

For access to fully linked references, you need to log in.
    M. Covington, M. AlHajDarwish, Y. Ding, N. J. Gokemeijer, and M. A. Seigler, Phys. Rev. B 69, 184406 (2004).

    Q. Mistral, J.-V. Kim, T. Devolder, P. Crozat, C. Chappert, J. A. Katine, M. J. Carey, and K. Ito, Appl. Phys. Lett. 88, 192507 (2006)APPLAB000088000019192507000001.

    D. Houssameddine, U. Ebels, B. Dieny, K. Garello, J.-P. Michel, B. Delaet, B. Viala, M.-C. Cyrille, J. A. Katine, and D. Mauri, Phys. Rev. Lett. 102, 257202 (2009).

    G. Finocchio, G. Siracusano, V. Tiberkevich, I. N. Krivorotov, L. Torres, and B. Azzerboni, Phys. Rev. B 81, 184411 (2010).

    K. Kudo, T. Nagasawa, R. Sato, and K. Mizushima, J. Appl. Phys. 105, 07D105 (2009)JAPIAU00010500000707D105000001.

    L. Bianchini, S. Cornelissen, J.-V. Kim, T. Devolder, W. van Roy, L. Lagae, and C. Chappert, Appl. Phys. Lett. 97, 032502 (2010)APPLAB000097000003032502000001.

    S. Bonetti, V. Tiberkevich, G. Consolo, G. Finocchio, P. Muduli, F. Mancoff, A. Slavin, and J. Akerman, Phys. Rev. Lett. 105, 217204 (2010).

    K. V. Thadani, G. Finocchio, Z.-P. Li, O. Ozatay, J. C. Sankey, I. N. Krivorotov, Y.-T. Cui, R. A. Buhrman, and D. C. Ralph. Phys. Rev. B 78, 024409 (2008).

    K. Mizushima, T. Nagasawa, K. Kudo, Y. Saito, and R. Sato, Appl. Phys. Lett. 94, 152501 (2009)APPLAB000094000015152501000001.

    K. Kudo, T. Nagasawa, R. Sato, and K. Mizushima, Appl. Phys. Lett. 95, 022507 (2009)APPLAB000095000002022507000001.

    K. Kudo, T. Nagasawa, H. Suto, R. Sato, and K. Mizushima, Phys. Rev. B 81, 224432 (2010).

    G. Finocchio, I. N. Krivorotov, L. Torres, R. A. Buhrman, D. C. Ralph, and B. Azzerboni, Phys. Rev. B 76, 174408 (2007).

    P. Lubitz, M. Rubinstein, J. J. Krebs, and S. F. Cheng, J. Appl. Phys. 89, 6901 (2001)JAPIAU000089000011006901000001.

    A. Slavin and V. Tiberkevich, Phys. Rev. B 72, 094428 (2005).

    L. Torres, L. Lopez-Diaz, E. Martinez, G. Finocchio, M. Carpentieri, and B. Azzerboni, J. Appl. Phys. 101, 053914 (2007)JAPIAU000101000005053914000001.

    G. Siracusano, G. Finocchio, A. La Corte, G. Consolo, L. Torres, and B. Azzerboni, Phys. Rev. B 79, 104438 (2009).

    S. Favue and O. Thaul, Phys. Rev. Lett. 64, 282 (1990).

    R. D. Hempstead and M. Lax, Phys. Rev. 161, 350 (1967).

    O. V. Ushakov, H.-J. Wünsche, F. Henneberger, I. A. Khovanov, L. Schimansky-Geier, and M. A. Zaks, Phys. Rev. Lett. 95, 123903 (2005).

    S. M. Rezende, F.M. de Aguiar, and A. Azevedo, Phys. Rev. Lett. 94, 037202 (2005).

    C. Boone, J. A. Katine, J. R. Childress, J. Zhu, X. Cheng, and I. N. Krivorotov, Phys. Rev. B 79, 140404(R) (2009).

    C. Wang, Y.-T. Cui, J. Z. Sun, J. A. Katine, R. A. Buhrman, and D. C. Ralph, J. Appl. Phys. 106, 053905 (2009)JAPIAU000106000005053905000001.


Figures (4)

Access to article objects (figures, tables, multimedia) requires a subscription; log in to view available files.
(Access to supplementary files, where available, is free for this journal.)



Close

Google Calendar

ADVERTISEMENT

Your Recent History Recent History Help

Recently Viewed

  1. Hysteretic spin-wave excitation in spin-torque oscillators as a function of the in-plane field angle: A micromagnetic description
  2. Tunning of microstructure and thermoelectric properties of Ca3Co4O9 ceramics by high-magnetic-field sintering
  3. A semi-analytical model for semiconductor solar cells
  4. Gauge fields in spintronics
  5. Local density of trap states in SiO2 and Si3N4 films studied by single electron tunneling force spectroscopy
Go to AIP Home
Copyright © American Institute of Physics
close