State diagram of nanopillar spin valves with perpendicular magnetic anisotropy

S. Le Gall, J. Cucchiara, M. Gottwald, C. Berthelot, C. H. Lambert, Y. Henry, D. Bedau, D. B. Gopman, H. Liu, A. D. Kent, J. Z. Sun, W. Lin, D. Ravelosona, J. A. Katine, Eric E. Fullerton, S. Mangin

    Research output: Contribution to journalArticlepeer-review


    The spin-torque switching of metallic nanopillar spin valves showing strong perpendicular anisotropy are studied. The magnetic states of the layers depend on extrinsic parameters such as the magnetic field and the dc current applied to the device. A state diagram presents a comprehensive graph of the role of those parameters on the spin-valve magnetic response. After explaining how state diagrams can be built and the different possible representation, experimental state diagrams are studied for perpendicular devices and the influence of lateral size, temperature, and field orientation are shown. An analytical model of a purely uniaxial system is presented. It is shown that this simple model does not properly reflect the experimental results, whereas if the symmetry is broken a qualitative agreement is obtained. Finally, the possible origins of the symmetry break are discussed in light of an analytical model and numerical simulations.

    Original languageEnglish (US)
    Article number014419
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Issue number1
    StatePublished - Jul 18 2012

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics


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