Abstract
Amorphization phenomenon of yttrium iron garnet (YIG) Y3Fe5O12 induced by 1 GeV Ar ions irradiation at the temperature 195 K has been investigated by means of the sample-tilting X-ray diffraction (STD), optical absorption spectroscopy, Mössbauer spectroscopy and saturation magnetization measurement. The analysis results indicate that there exist a critical dose 1.0 × 1014ions/cm2 and a threshold value of electronic energy loss Se = 2.9MeV/μm. Above both values the lattice constant a, the optical absorption coefficient α, and the fraction of the paramagnetic phase Fp increase with the increase of electronic energy loss, but saturation magnetization decreases. For the first time, the nearly complete amorphous state was observed at Se = 8.3MeV μm with irradiation doses equal or more than 1.0 × 1014ions/cm2. It is found that the transformation from crystalline to amorphous state is a gradual process in which the electronic stopping power plays a main role and a certain dose is needed.
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