Journal
JOURNAL OF LUMINESCENCE
Volume 108, Issue 1-4, Pages 225-228Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2004.01.048
Keywords
magnetic transition; critical relaxation phenomena; photo-induced phase transition
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We have investigated dynamical properties of the spin system in a ferromagnetic CrO2 thin film by means of a nanosecond pump-probe method. The absorption spectrum consists of both temperature-dependent and -independent components, which indicates a characteristic electronic structure with localized and itinerant spins in a double-exchange system. With strong pulse excitations we have observed absorption changes reflecting photo-induced spin disorder in the ferromagnetic phase. The temperature variation of the relaxation time near the Curie temperature shows a critical slowing down of the relaxation time near the phase transition. The critical exponent obtained is 0.18+/-0.01. (C) 2004 Elsevier B.V. All rights reserved.
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