State diagram of nanopillar spin valves with perpendicular magnetic anisotropy | Zendy

Sylvain Le Gall | Zendy; J. Cucchiara | Zendy; M. Gottwald | Zendy; Christel Berthelot | Zendy; CharlesHenri Lambert | Zendy; Y. Henry | Zendy; Daniel Bedau | Zendy; Daniel B. Gopman | Zendy; H. Liu | Zendy; Andrew D. Kent | Zendy; J. Z. Sun | Zendy; Weiwei Lin | Zendy; D. Ravelosona | Zendy; J. A. Katine | Zendy; Eric E. Fullerton | Zendy; S. Mangin | Zendy

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State diagram of nanopillar spin valves with perpendicular magnetic anisotropy

Author(s) -

Sylvain Le Gall,

J. Cucchiara,

M. Gottwald,

Christel Berthelot,

CharlesHenri Lambert,

Y. Henry,

Daniel Bedau,

Daniel B. Gopman,

H. Liu,

Andrew D. Kent,

J. Z. Sun,

Weiwei Lin,

D. Ravelosona,

J. A. Katine,

Eric E. Fullerton,

S. Mangin

Publication year - 2012

Publication title -

physical review b

Language(s) - English

Resource type - Journals

eISSN - 1538-4489

pISSN - 1098-0121

DOI - 10.1103/physrevb.86.014419

Subject(s) - nanopillar , condensed matter physics , spin valve , magnetic field , perpendicular , anisotropy , symmetry (geometry) , magnetic anisotropy , materials science , physics , magnetoresistance , magnetization , optics , geometry , nanotechnology , quantum mechanics , nanostructure , mathematics

International audienceThe 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

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