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

Magnetization Effects in Proton Micro-Irradiated Diamond