【摘 要】
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Recently,a great deal of research has been dedicated to GdFeCo film in the past few years since its magnetization switching is experimentally observed in subpic
【机 构】
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中国科学院物理研究所磁学国家重点实验室,北京100190
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Recently,a great deal of research has been dedicated to GdFeCo film in the past few years since its magnetization switching is experimentally observed in subpicosecond time scale by femtosecond laser pulses,thereby it promises a method to approach ultimate speed for designing faster magnetic data-storage and spintronic devices.Regardless the microscopic mechanism of the ultrafast magnetization dynamics of GdFeCo film is still under debate,it is considerable to treat the ferrimagnetic alloy GdFeCo as the Gd and FeCo two sublattices to resolve the origin of this magnetization reversal.Recently,Mekonnen et al.observed a three-step demagnetization process in GdCo and GdFeCo films and explained the much slower process (～200 ps) as the demagnetization signal of Gd sublattice.This timescale is consistent with the demagnetization times of pure Gd film,which is two- or three-order-magnitude larger than Fe or Co film.
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