Europhys. Lett.
Volume 73, Number 2, January 2006
Page(s) 285 - 291
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 02 December 2005
Europhys. Lett., 73 (2), pp. 285-291 (2006)
DOI: 10.1209/epl/i2005-10375-8

Spin-lattice relaxation phenomena in manganite $\chem{La_{0.7}Sr_{0.3}MnO_{3}}$ thin films

M. C. Weber1, B. Hillebrands1, V. Moshnyaga2 and K. Samwer2

1  Fachbereich Physik und Forschungsschwerpunkt MINAS Technische Universität Kaiserslautern - Erwin-Schrödinger-Str. 56 67663 Kaiserslautern, Germany
2  I. Physikalisches Institut, Universität Göttingen Friedrich-Hund-Platz 1, 37077 Göttingen, Germany

received 21 July 2005; accepted in final form 15 November 2005
published online 2 December 2005

Time-resolved magneto-optics was used to study spin-lattice relaxation dynamics in thin epitaxial $\chem{La_{0.7}Sr_{0.3}MnO_{3}}$ films. Two distinct recovery regimes of the ferromagnetic order can be resolved upon photoexcitation, which manifest themselves by two different relaxation times. A pump pulse energy-independent spin-lattice relaxation time can be deduced. Due to a weak spin-orbit coupling in manganites this spin-lattice relaxation time is much longer than in ferromagnetic metals. Heat flow into the substrate sets the ultimate recovery speed of the ferromagnetic order and allows for a determination of heat diffusion properties of manganite films.

78.47.+p - Time-resolved optical spectroscopies and other ultrafast optical measurements in condensed matter.
75.70.-i - Magnetic properties of thin films, surfaces, and interfaces.
75.40.Gb - Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.).

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