3D-Hydrogen analysis of ferromagnetic microstructures in proton irradiated graphite

P Reichart; D Spemann; A Hauptner; A Bergmaier; V Hable; R Hertenberger; C Greubel; A Setzer; G Dollinger; DN Jamieson; T Butz; P Esquinazi

Journal article

3D-Hydrogen analysis of ferromagnetic microstructures in proton irradiated graphite

P Reichart, D Spemann, A Hauptner, A Bergmaier, V Hable, R Hertenberger, C Greubel, A Setzer, G Dollinger, DN Jamieson, T Butz, P Esquinazi

Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms | ELSEVIER | Published : 2006

DOI: 10.1016/j.nimb.2006.04.014

Abstract

Recently, magnetic order in highly oriented pyrolytic graphite (HOPG) induced by proton broad- and microbeam irradiation was discovered. Theoretical models propose that hydrogen could play a major role in the magnetism mechanism. We analysed the hydrogen distribution of pristine as well as irradiated HOPG samples, which were implanted to μm-sized spots as well as extended areas with various doses of 2.25 MeV protons at the Leipzig microprobe LIPSION. For this we used the sensitive 3D hydrogen microscopy system at the Munich microprobe SNAKE. The background hydrogen level in pristine HOPG is determined to be less than 0.3 at-ppm. About 4.8 × 1015 H-atoms/cm2 are observed in the near-surface r..

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