Abstract
The effects of heavy ion irradiation 1.8 GeV Ar and 2.9 GeV Kr in yttrium iron garnet have been investigated by means of electron diffraction, high resolution electron microscopy (HREM) and magnetization measurements. In the high energy zone (1.2 < E < 1.8 GeV for Ar ions and 2.1 < E < 2.9 GeV for Kr ions) a contrast of black and white stripes has been observed on HREM micrographs and assumed to be due to displacement cascade damage type. In the low energy zone (0 < E < 0.6 GeV for Ar ions and 0 < E < 0.9 GeV for Kr ions), a drastic change of the saturation magnetization has been observed and associated to a transition from a crystalline to amorphous state. The effect has been interpreted in term of atomic displacements rather than in term of tracks.
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