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

doi:10.1103/PhysRevB.86.014419

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 journal › Article › peer-review

Abstract

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 language	English (US)
Article number	014419
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	86
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevB.86.014419
State	Published - Jul 18 2012

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.86.014419

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Le Gall, S., Cucchiara, J., Gottwald, M., Berthelot, C., Lambert, C. H., Henry, Y., Bedau, D., Gopman, D. B., Liu, H., Kent, A. D., Sun, J. Z., Lin, W., Ravelosona, D., Katine, J. A., Fullerton, E. E., & Mangin, S. (2012). State diagram of nanopillar spin valves with perpendicular magnetic anisotropy. Physical Review B - Condensed Matter and Materials Physics, 86(1), Article 014419. https://doi.org/10.1103/PhysRevB.86.014419

Le Gall, S, Cucchiara, J, Gottwald, M, Berthelot, C, Lambert, CH, Henry, Y, Bedau, D, Gopman, DB, Liu, H, Kent, AD, Sun, JZ, Lin, W, Ravelosona, D, Katine, JA, Fullerton, EE & Mangin, S 2012, 'State diagram of nanopillar spin valves with perpendicular magnetic anisotropy', Physical Review B - Condensed Matter and Materials Physics, vol. 86, no. 1, 014419. https://doi.org/10.1103/PhysRevB.86.014419

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title = "State diagram of nanopillar spin valves with perpendicular magnetic anisotropy",

abstract = "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.",

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

year = "2012",

month = jul,

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doi = "10.1103/PhysRevB.86.014419",

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AU - Le Gall, S.

AU - Cucchiara, J.

AU - Gottwald, M.

AU - Berthelot, C.

AU - Lambert, C. H.

AU - Henry, Y.

AU - Bedau, D.

AU - Gopman, D. B.

AU - Liu, H.

AU - Kent, A. D.

AU - Sun, J. Z.

AU - Lin, W.

AU - Ravelosona, D.

AU - Katine, J. A.

AU - Fullerton, Eric E.

AU - Mangin, S.

PY - 2012/7/18

Y1 - 2012/7/18

N2 - 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.

AB - 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.

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State diagram of nanopillar spin valves with perpendicular magnetic anisotropy

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