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Spin-Transfer Torque Effects in Single-Crystalline Nanopillars

  • D. E. BürglerEmail author
  • R. Lehndorff
  • V. Sluka
  • A. Kákay
  • R. Hertel
  • C. M. Schneider
Part of the Springer Series in Materials Science book series (SSMATERIALS, volume 175)

Abstract

We review our recent work on spin-transfer torque (STT) effects in single-crystalline, all-metal nanopillars. The experiments deal with current-driven magnetization switching and excitation of steady-state high-frequency magnetic oscillatory modes. The interplay between the magnetocrystalline anisotropy and STT gives rise to a two-step switching mechanism and to zero-field magnetic precession. Both are manifestations of the angular STT asymmetry and are explained within Slonczewski’s theory for currents and torques in metallic multilayers. The normal and inverse torques observed in a double spin-valve nanopillar are related to spin-dependent interface resistances and confirm ab initio calculations by Stiles and Penn. The magnetization of a nanodisk of suitable aspect ratio can be switched by STT between the quasi-uniform and the vortex configuration. The STT-excited gyrotropic mode of the vortex emits more microwave power than the standing-wave mode and can be locked to an external high-frequency signal in a wide frequency range.

Keywords

Magnetocrystalline Anisotropy Vortex State Free Layer Fixed Layer Micromagnetic Simulation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

The authors gratefully acknowledge the contributions of Z. Celinski, H. Dassow, S. Gliga, P. Grünberg, F.-J. Köhne, and R. Schreiber to the results described in this review article. The work was partly funded by the German academic exchange service (DAAD) and at UCCS by the NSF (Grant No. DMR-0605629) and the ARO (Grant No. W911NF-04-1-0247).

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • D. E. Bürgler
    • 1
    Email author
  • R. Lehndorff
    • 1
    • 2
  • V. Sluka
    • 1
    • 3
  • A. Kákay
    • 1
  • R. Hertel
    • 1
    • 4
  • C. M. Schneider
    • 1
  1. 1.Peter Grünberg Institut, Electronic Properties (PGI-6) and Jülich-Aachen Research Alliance, Fundamentals for Future Information Technology (JARA-FIT)Research Center Jülich GmbHJülichGermany
  2. 2.Sensitec GmbHMainzGermany
  3. 3.Institute of Ion Beam Physics and Materials ResearchHelmholtz-Zentrum Dresden-Rossendorf e.V.DresdenGermany
  4. 4.Institut de Physique et Chimie des Matériaux de StrasbourgCNRS UMR 7504, Université de StrasbourgStrasbourgFrance

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