Blank line (12 points)We would be very grateful if you write your abstract for the Hyperfine interactions 2010 conference in this style. Please help us in making an attractive Book of Abstracts by adhering to these instructions and following the example provided. The abstract should be 1 page long (maximum) in the A4 standard format, portrait layout, top margin 3 cm, left, right and bottom margins 2.5cm. Please use Times New Roman or Times Roman font. The title font size is 14 points, bold, centered and two lines maximum. After the title leave a blank line, 12 points size. The authors list is 12 points font size, bold, centered and the presenting author underlined. Leave a blank line, 12 points font size, separating the authors from the affiliations. Affiliations list is 11 point font size, italic and centered. A full postal address (including, if available, the e-mail) should be given at least for the presenting author.

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The influence of the ion implantation process on the charge state of dilute (57)Fe impurities implanted as radioactive (57)Mn in ZnO is investigated by (57)Fe emission Mössbauer spectroscopy. One sample is additionally implanted with stable (23)Na impurities. Both Fe(2+) and Fe(3+) charge states are observed, and the Fe(3+)/Fe(2+) ratio is found to increase with the fluence of both (57)Mn/(57)Fe and (23)Na ions, demonstrating that the build-up of Fe(3+) is not related to the chemical nature of the implanted ions. The results are interpreted in terms of radiation damage induced changes of the Fermi level, and illustrate that the Fe(3+)/Fe(2+) ratio can be adjusted by ion implantation. The spin-lattice relaxation time for Fe(3+) in ZnO is found to be independent of the implantation fluence, and is evidently an intrinsic property of the system.

In search for dilute magnetic semiconductors, the magnetic properties at the atomic-scale of Fe atoms incorporated in ZnO, in a concentration range of more than fi ve orders of magnitude from 1 × 10 −5 to 2.2 at% have been probed using emission 57

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