{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,29]],"date-time":"2026-04-29T15:15:53Z","timestamp":1777475753686,"version":"3.51.4"},"reference-count":25,"publisher":"AIP Publishing","issue":"2","content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2007,1,15]]},"abstract":"<jats:p>The wide-band-gap zinc oxide-based diluted magnetic semiconductors currently attract considerable attention due to their possible use in spintronic devices. In this work, we studied ZnO nanowire samples synthesized on 10\u00d710\u2009mm2\u2008a-plane sapphire substrates by high-pressure pulsed laser deposition. The samples were characterized by scanning electron microscopy (SEM) and electron paramagnetic resonance (EPR) in the X-band (\u22439.3 GHz) from T=4 to 300 K. According to the SEM pictures, the nanowires exhibit a length of about 1\u2009\u03bcm and are aligned perpendicular to the substrate surface. The structures have a hexagonal cross section and their diameter ranges from 60 nm up to 150 nm. For the lowest nominal concentrations of xMn=3 at.\u2009% and xCo=5 at.\u2009%, we detect the anisotropic EPR spectra of isolated Mn2+ (3d5, S6) and Co2+ (3d7, F4), respectively, on Zn sites. The detection of the well-resolved anisotropic spectra proves a coherent crystallographic orientation of the nanowires. The linewidth was larger than the best values reported in the literature. Nevertheless, it was possible to identify two different components, A and B, of the reported spectra. From the temperature dependence of the EPR intensity, we found that both components exhibit paramagnetic behavior and are present in a concentration ratio of NB\u2215NA=1.4. In the case of the Mn-doped ZnO wires, the linewidth increases with increasing Mn concentration due to the dipole-dipole interaction of the paramagnetic ions. At the highest used nominal concentration, xMn=10 at.\u2009%, an additional broad single line is observed.<\/jats:p>","DOI":"10.1063\/1.2402095","type":"journal-article","created":{"date-parts":[[2007,2,2]],"date-time":"2007-02-02T16:33:49Z","timestamp":1170434029000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":34,"title":["Electron paramagnetic resonance in transition metal-doped ZnO nanowires"],"prefix":"10.1063","volume":"101","author":[{"given":"A. O.","family":"Ankiewicz","sequence":"first","affiliation":[{"name":"Universidade de Aveiro Departamento de F\u00edsica, , 3810-193 Aveiro, Portugal"}]},{"given":"M. C.","family":"Carmo","sequence":"additional","affiliation":[{"name":"Universidade de Aveiro Departamento de F\u00edsica, , 3810-193 Aveiro, Portugal"}]},{"given":"N. A.","family":"Sobolev","sequence":"additional","affiliation":[{"name":"Universidade de Aveiro Departamento de F\u00edsica, , 3810-193 Aveiro, Portugal"}]},{"given":"W.","family":"Gehlhoff","sequence":"additional","affiliation":[{"name":"echnische Universit\u00e4t Berlin Institut f\u00fcr Festk\u00f6rperphysik, T , D-10623 Berlin, Germany"}]},{"given":"E. M.","family":"Kaidashev","sequence":"additional","affiliation":[{"name":"Universit\u00e4t Leipzig Institut f\u00fcr Experimentelle Physik II, , D-04103 Leipzig, Germany"}]},{"given":"A.","family":"Rahm","sequence":"additional","affiliation":[{"name":"Universit\u00e4t Leipzig Institut f\u00fcr Experimentelle Physik II, , D-04103 Leipzig, Germany"}]},{"given":"M.","family":"Lorenz","sequence":"additional","affiliation":[{"name":"Universit\u00e4t Leipzig Institut f\u00fcr Experimentelle Physik II, , D-04103 Leipzig, Germany"}]},{"given":"M.","family":"Grundmann","sequence":"additional","affiliation":[{"name":"Universit\u00e4t Leipzig Institut f\u00fcr Experimentelle Physik II, , D-04103 Leipzig, Germany"}]}],"member":"317","published-online":{"date-parts":[[2007,1,29]]},"reference":[{"key":"2023072620024062800_c1","doi-asserted-by":"publisher","first-page":"1","DOI":"10.1016\/j.mser.2004.09.001","volume":"47","year":"2004","journal-title":"Mater. Sci. 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