Microscopic model for fs magnetization dynamics

B. Koopmans; H.H.J.E. Kicken; M. Kampen, van; W.J.M. Jonge, de

Microscopic model for fs magnetization dynamics

B. Koopmans, H.H.J.E. Kicken, M. Kampen, van, W.J.M. Jonge, de

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic

Abstract

Over the past few years a wealth of new data on laser-induced ultrafast magnetization dynamics has become available. By now, it is generally agreed on that within a few hundred femtoseconds after laser excitation of ferromagnetic transition metals such as nickel the spin system equilibrates at a reduced magnetization. As to the underlying physics that enables such an ultrafast response little is known. In this presentation we report first results of a fully microscopic approach based on a simple model Hamiltonian that describes the interactions between a Fermi sea of (spinless) electrons, an ensemble of two level oscillators representing the phonon system, and a magnetic degree of freedom described by a Weiss model. In particular we include an Elliot-Yafet type of spin-orbit induced spin scattering by assigning a spin- flip probability aEY to each electron-phonon (e-p) scattering event. The e-

Original language	English
Title of host publication	Proceedings of the 5th International Symposium on Metallic Multilayers (MML 2004), 7-11 June 2004, Boulder, Colorado, U.S.A.
Publication status	Published - 2004
Event	conference; 5th International Symposium on Metallic Multilayers (MML 2004) - Duration: 1 Jan 2004 → …

Conference

Conference	conference; 5th International Symposium on Metallic Multilayers (MML 2004)
Period	1/01/04 → …
Other	5th International Symposium on Metallic Multilayers (MML 2004)

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@inproceedings{8d522e74289d481994a4a4977f17729a,

title = "Microscopic model for fs magnetization dynamics",

abstract = "Over the past few years a wealth of new data on laser-induced ultrafast magnetization dynamics has become available. By now, it is generally agreed on that within a few hundred femtoseconds after laser excitation of ferromagnetic transition metals such as nickel the spin system equilibrates at a reduced magnetization. As to the underlying physics that enables such an ultrafast response little is known. In this presentation we report first results of a fully microscopic approach based on a simple model Hamiltonian that describes the interactions between a Fermi sea of (spinless) electrons, an ensemble of two level oscillators representing the phonon system, and a magnetic degree of freedom described by a Weiss model. In particular we include an Elliot-Yafet type of spin-orbit induced spin scattering by assigning a spin- flip probability aEY to each electron-phonon (e-p) scattering event. The e-",

author = "B. Koopmans and H.H.J.E. Kicken and {Kampen, van}, M. and {Jonge, de}, W.J.M.",

year = "2004",

language = "English",

booktitle = "Proceedings of the 5th International Symposium on Metallic Multilayers (MML 2004), 7-11 June 2004, Boulder, Colorado, U.S.A.",

note = "conference; 5th International Symposium on Metallic Multilayers (MML 2004) ; Conference date: 01-01-2004",

}

TY - GEN

T1 - Microscopic model for fs magnetization dynamics

AU - Koopmans, B.

AU - Kicken, H.H.J.E.

AU - Kampen, van, M.

AU - Jonge, de, W.J.M.

PY - 2004

Y1 - 2004

N2 - Over the past few years a wealth of new data on laser-induced ultrafast magnetization dynamics has become available. By now, it is generally agreed on that within a few hundred femtoseconds after laser excitation of ferromagnetic transition metals such as nickel the spin system equilibrates at a reduced magnetization. As to the underlying physics that enables such an ultrafast response little is known. In this presentation we report first results of a fully microscopic approach based on a simple model Hamiltonian that describes the interactions between a Fermi sea of (spinless) electrons, an ensemble of two level oscillators representing the phonon system, and a magnetic degree of freedom described by a Weiss model. In particular we include an Elliot-Yafet type of spin-orbit induced spin scattering by assigning a spin- flip probability aEY to each electron-phonon (e-p) scattering event. The e-

AB - Over the past few years a wealth of new data on laser-induced ultrafast magnetization dynamics has become available. By now, it is generally agreed on that within a few hundred femtoseconds after laser excitation of ferromagnetic transition metals such as nickel the spin system equilibrates at a reduced magnetization. As to the underlying physics that enables such an ultrafast response little is known. In this presentation we report first results of a fully microscopic approach based on a simple model Hamiltonian that describes the interactions between a Fermi sea of (spinless) electrons, an ensemble of two level oscillators representing the phonon system, and a magnetic degree of freedom described by a Weiss model. In particular we include an Elliot-Yafet type of spin-orbit induced spin scattering by assigning a spin- flip probability aEY to each electron-phonon (e-p) scattering event. The e-

M3 - Conference contribution

BT - Proceedings of the 5th International Symposium on Metallic Multilayers (MML 2004), 7-11 June 2004, Boulder, Colorado, U.S.A.

T2 - conference; 5th International Symposium on Metallic Multilayers (MML 2004)

Y2 - 1 January 2004

ER -