Quantitative determination of the magnetization of proton irradiated spots in graphite with magnetic force microscopy

摘要

Using the point probe approximation of magnetic force microscopy (MFM) and measurements of the MFM signal as a function of the tip-to-sample distance, we have determined quantitatively the magnetization of proton irradiated spots in highly oriented pyrolytic graphite. From different spots produced with ion fluences ranging from 0.05 to 75 nC/mum(2) we obtained magnetization values of the order of 10(6) A/m. These values are in the same range of those from soft magnetic materials. (C) 2004 American Institute of Physics.