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Spin-Wave Eigen-modes in a Normally Magnetized Nano-pillar

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Magnonics

Part of the book series: Topics in Applied Physics ((TAP,volume 125))

Abstract

We report on a spectroscopic study of the spin-wave eigen-modes in a circular spin-valve nano-pillar, perpendicularly magnetized along \({\hat{\boldsymbol{z}}}\). Spectroscopy is performed by Magnetic Resonance Force Microscopy (MRFM). Distinct spectra are measured depending on whether the nano-pillar is excited by a uniform in-plane radio-frequency (RF) magnetic field or by an RF current flowing perpendicularly through the layers. These results are in agreement with micromagnetic simulations of the time decay response of the local magnetization to excitations with different azimuthal symmetries, \(({\hat{\boldsymbol{x}}} + i {\hat{\boldsymbol {y}}})e^{-i\ell\phi}\). This demonstrates that the azimuthal ℓ-index is the discriminating parameter for the selection rules, as only ℓ=0 modes are excited by the RF magnetic field, whereas only ℓ=+1 modes are excited by the RF current, owing to the orthoradial symmetry of the induced RF Oersted field.

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Acknowledgements

We thank V. Cros, J. Grollier, H. Hurdequint, C. Ulysse, G. Faini, V.S. Tiberkevich, and A.N. Slavin for their help and support. This research was partially supported by the European Grant Master (NMP-FP7 212257) and by the French Grant Voice (ANR-09-NANO-006-01).

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Authors and Affiliations

  1. Service de Physique de l’État Condensé (URA 2464), CEA Saclay, 91191, Gif-sur-Yvette, France

    V. V. Naletov, G. de Loubens, S. Borlenghi & O. Klein

  2. Physics Department, Kazan Federal University, Kazan, 420008, Russian Federation

    V. V. Naletov

Authors
  1. V. V. Naletov
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  2. G. de Loubens
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  3. S. Borlenghi
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  4. O. Klein
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Correspondence to G. de Loubens .

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Editors and Affiliations

  1. Inst. Angewandte Physik, Universität Münster Inst. Angewandte Physik, Münster, Germany

    Sergej O. Demokritov

  2. Department of Physics, Oakland University, Rochester, MI, Michigan, USA

    Andrei N. Slavin

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Naletov, V.V., de Loubens, G., Borlenghi, S., Klein, O. (2013). Spin-Wave Eigen-modes in a Normally Magnetized Nano-pillar. In: Demokritov, S., Slavin, A. (eds) Magnonics. Topics in Applied Physics, vol 125. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-30247-3_1

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  • DOI: https://doi.org/10.1007/978-3-642-30247-3_1

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