Amorphization induced by energetic heavy ion bombardment in hexagonal ferrite BaFe 12 O 19

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Abstract
Single crystals and polycrystalline samples of hexagonal ferrite BaFe12O19 have been irradiated with argon and krypton ions of energies 44 MeV/A and 35 MeV/A respectively and doses ranging from 1013 to 1015 Ar24+cm−2 and from 1012 to 1014 Kr16+cm−2. Changes in magnetic properties and microstructure have been investigated by saturation magnetization measurements and high resolution electron microscopy. The results lead to the separation of the stopping ion zone from the electronic slowing down region. A crystal to amorphous transformation occurs in the the former when approximately 10−2 atom has been displaced per atomic collision. The transition can be explained on the basis of an amorphization process wherein high density defects regions shall be created by the primary ejected ions.