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(a) A X-ray diffraction pattern for a 4 nm thick film. (b) Magnetization curves for a 4-nm- alloy epitaxial film with the applied field parallel and to perpendicular to the film plane. The solid curve is a theoretical calculation based on the uniform magnetization rotation model.
(a) Time-resolved Kerr signals for the epitaxial film of with various pump laser fluences , measured with applied field at field angle , as defined in (b). Solid curves plot the parameter-fitted damped-harmonic function of the data to obtain precession frequency and inverse of life-time for the film. (b) Schematic of time-resolved measurement geometry. A precession of magnetization is excited about which represents an initial equilibrium direction of . (c) dependence of and . Solid curves are as visual guides.
(a) Time-resolved Kerr signals for the thin film with different field directions , measured at applied field and pump fluence . A damped-harmonic function has been parameter-fitted to the data (solid curves). Precession frequency (●) and inverse of life-time (○) for the film as a function of (b) and (c). In (b) and (c), theoretical calculations of are fitted to the data (solid curves) and broken curves are typical theoretical calculations of with a Gilbert damping constant of 0.055.
Effective damping constant , defined as , for the thin film as a function of (a) magnetic field direction and (b) strength .
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