Unifying ultrafast magnetization dynamics
We present a microscopic model that successfully explains the ultrafast equilibration of magnetic order in ferromagnetic metals at a time scale tau(M) of only a few hundred femtoseconds after pulsed laser excitation. It is found that tau(M) can be directly related to the so-called Gilbert damping fa...
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| Veröffentlicht in: | Physical review letters 2005-12, Vol.95 (26), p.267207.1-267207.4, Article 267207 |
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| container_end_page | 267207.4 |
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| container_issue | 26 |
| container_start_page | 267207.1 |
| container_title | Physical review letters |
| container_volume | 95 |
| creator | KOOPMANS, B RUIGROK, J. J. M DALLA LONGA, F DE JONGE, W. J. M |
| description | We present a microscopic model that successfully explains the ultrafast equilibration of magnetic order in ferromagnetic metals at a time scale tau(M) of only a few hundred femtoseconds after pulsed laser excitation. It is found that tau(M) can be directly related to the so-called Gilbert damping factor sigma that describes damping of GHz precessional motion of the magnetization vector. Independent of the spin-scattering mechanism, an appealingly simple equation relating the two key parameters via the Curie temperature T(C) is derived, tau(M) approximately c(0)h/k(B)T(C)sigma, with h and k(B) the Planck and Boltzmann constants, respectively, and the prefactor c(0) approximately 1/4). We argue that phonon-mediated spin-flip scattering may contribute significantly to the sub-ps response. |
| doi_str_mv | 10.1103/PhysRevLett.95.267207 |
| format | Article |
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| subjects | Condensed matter: electronic structure, electrical, magnetic, and optical properties Critical-point effects, specific heats, short-range order Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.) Exact sciences and technology Magnetic properties and materials Physics |
| title | Unifying ultrafast magnetization dynamics |
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