  We report the magnetic response of high purity type IIa single crystal CVD
diamond following high energy irradiation by 2.2 MeV proton micro-beams,
produced using Nuclear Microprobe techniques. Post-irradiation microanalysis is
achieved using Atomic Force, Magnetic Force and Electrostatic Force Microscopy
(AFM, MFM & EFM) as well as Raman spectroscopy. Comparison between MFM and EFM
measurements at zero electrical bias is used to preclude artefacts of
electrostatic origin suggesting the presence of magnetic states in the
microscale regions induced by proton micro-irradiation. Analysis of the
irradiated regions using probe polarization dependent magnetization
measurements shows an irradiation induced magnetic response consistent with
ferromagnetic ordering at room temperature. Structural characterization of the
micro-irradiated regions using micro-Raman spectroscopy indicates a correlation
between formation of the sp2 carbon phase in the diamond matrix with the scale
of the observed magnetization, in the investigated experimental regime.
