Speed and efficiency of femtosecond spin current injection into a nonmagnetic material

M. Hofherr; P. Maldonado; O. Schmitt; M. Berritta; U. Bierbrauer; S. Sadashivaiah; A.J. Schellekens; B. Koopmans; D. Steil; M. Cinchetti; B. Stadtmüller; P.M. Oppeneer; S. Mathias; M. Aeschlimann

doi:10.1103/PhysRevB.96.100403

Speed and efficiency of femtosecond spin current injection into a nonmagnetic material

M. Hofherr, P. Maldonado, O. Schmitt, M. Berritta, U. Bierbrauer, S. Sadashivaiah, A.J. Schellekens, B. Koopmans, D. Steil, M. Cinchetti, B. Stadtmüller, P.M. Oppeneer, S. Mathias, M. Aeschlimann

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Abstract

We investigate femtosecond spin injection from an optically excited Ni top layer into an Au bottom layer using time-resolved complex magneto-optical Kerr effect (C-MOKE) measurements. Employing the C-MOKE formalism, we are able to follow layer-resolved demagnetization in Ni and the simultaneous spin injection into the adjacent Au film, both occurring within ∼40fs. We confirm the ballistic to diffusive propagation of the spin transfer process with ab initio theory and superdiffusive transport calculations. In particular, our combined experimental-theoretical effort does allow us to quantify the so far elusive amount of spin injection, and therefore the spin injection efficiency at the interface.

Original language	English
Article number	100403
Pages (from-to)	1-6
Journal	Physical Review B
Volume	96
Issue number	10
DOIs	https://doi.org/10.1103/PhysRevB.96.100403
Publication status	Published - 14 Sept 2017

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Hofherr, M., Maldonado, P., Schmitt, O., Berritta, M., Bierbrauer, U., Sadashivaiah, S., Schellekens, A. J., Koopmans, B., Steil, D., Cinchetti, M., Stadtmüller, B., Oppeneer, P. M., Mathias, S., & Aeschlimann, M. (2017). Speed and efficiency of femtosecond spin current injection into a nonmagnetic material. Physical Review B, 96(10), 1-6. Article 100403. https://doi.org/10.1103/PhysRevB.96.100403

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abstract = "We investigate femtosecond spin injection from an optically excited Ni top layer into an Au bottom layer using time-resolved complex magneto-optical Kerr effect (C-MOKE) measurements. Employing the C-MOKE formalism, we are able to follow layer-resolved demagnetization in Ni and the simultaneous spin injection into the adjacent Au film, both occurring within ∼40fs. We confirm the ballistic to diffusive propagation of the spin transfer process with ab initio theory and superdiffusive transport calculations. In particular, our combined experimental-theoretical effort does allow us to quantify the so far elusive amount of spin injection, and therefore the spin injection efficiency at the interface.",

author = "M. Hofherr and P. Maldonado and O. Schmitt and M. Berritta and U. Bierbrauer and S. Sadashivaiah and A.J. Schellekens and B. Koopmans and D. Steil and M. Cinchetti and B. Stadtm{\"u}ller and P.M. Oppeneer and S. Mathias and M. Aeschlimann",

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doi = "10.1103/PhysRevB.96.100403",

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Hofherr, M, Maldonado, P, Schmitt, O, Berritta, M, Bierbrauer, U, Sadashivaiah, S, Schellekens, AJ, Koopmans, B, Steil, D, Cinchetti, M, Stadtmüller, B, Oppeneer, PM, Mathias, S & Aeschlimann, M 2017, 'Speed and efficiency of femtosecond spin current injection into a nonmagnetic material', Physical Review B, vol. 96, no. 10, 100403, pp. 1-6. https://doi.org/10.1103/PhysRevB.96.100403

TY - JOUR

T1 - Speed and efficiency of femtosecond spin current injection into a nonmagnetic material

AU - Hofherr, M.

AU - Maldonado, P.

AU - Schmitt, O.

AU - Berritta, M.

AU - Bierbrauer, U.

AU - Sadashivaiah, S.

AU - Schellekens, A.J.

AU - Koopmans, B.

AU - Steil, D.

AU - Cinchetti, M.

AU - Stadtmüller, B.

AU - Oppeneer, P.M.

AU - Mathias, S.

AU - Aeschlimann, M.

PY - 2017/9/14

Y1 - 2017/9/14

N2 - We investigate femtosecond spin injection from an optically excited Ni top layer into an Au bottom layer using time-resolved complex magneto-optical Kerr effect (C-MOKE) measurements. Employing the C-MOKE formalism, we are able to follow layer-resolved demagnetization in Ni and the simultaneous spin injection into the adjacent Au film, both occurring within ∼40fs. We confirm the ballistic to diffusive propagation of the spin transfer process with ab initio theory and superdiffusive transport calculations. In particular, our combined experimental-theoretical effort does allow us to quantify the so far elusive amount of spin injection, and therefore the spin injection efficiency at the interface.

AB - We investigate femtosecond spin injection from an optically excited Ni top layer into an Au bottom layer using time-resolved complex magneto-optical Kerr effect (C-MOKE) measurements. Employing the C-MOKE formalism, we are able to follow layer-resolved demagnetization in Ni and the simultaneous spin injection into the adjacent Au film, both occurring within ∼40fs. We confirm the ballistic to diffusive propagation of the spin transfer process with ab initio theory and superdiffusive transport calculations. In particular, our combined experimental-theoretical effort does allow us to quantify the so far elusive amount of spin injection, and therefore the spin injection efficiency at the interface.

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U2 - 10.1103/PhysRevB.96.100403

DO - 10.1103/PhysRevB.96.100403

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VL - 96

SP - 1

EP - 6

JO - Physical Review B

JF - Physical Review B

IS - 10

M1 - 100403

ER -

Speed and efficiency of femtosecond spin current injection into a nonmagnetic material

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