Activation of additional energy dissipation processes in the magnetization dynamics of epitaxial chromium dioxide films

Details Activation of additional energy dissipation processes in the magnetization dynamics of epitaxial chromium dioxide films Activation of additional energy dissipation processes in the magnetization dynamics of epitaxial chromium dioxide films

2007-10-04

arxiv.org/abs/0710.0986v2

Phys. Rev. B. 77, 020412(R) (2008)

Physics

Condensed Matter

Other Condensed Matter

Scientific paper

10.1103/PhysRevB.77.020412

The precessional magnetization dynamics of a chromium dioxide$(100)$ film is examined in an all-optical pump-probe setup. The frequency dependence on the external field is used to extract the uniaxial in-plane anisotropy constant. The damping shows a strong dependence on the frequency, but also on the laser pump fluency, which is revealed as an important experiment parameter in this work: above a certain threshold further channels of energy dissipation open and the damping increases discontinuously. This behavior might stem from spin-wave instabilities.

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