Abstract
The effect of the implantation of 150 keV Ar+ ions at different doses on the surface of amorphous Fe40Ni40B20 and the changes in the bulk properties following proton irradiations are investigated by conversion electron and transmission Mossbauer spectroscopy respectively. In the former case a correlation between the total Mossbauer absorption and the total energy deposited by incident Ar+ ions is established, indicating the development of certain stresses in the material, affecting the inter and intra molecular bonding in the near surface region. On the other hand, the proton irradiation seems to cause a reorientation of the atomic spins and also the formation of an additional Fe or Fe−Ni rich phase in the sample. Also the low field A.C. susceptibility is found to decrease as a function of the dose of incident protons. Possible reasons for the above behaviour are discussed.
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