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MA: Magnetismus
MA 20: Poster: Films(1-36) Transp(37-56) Ex.Bias(57-67) Spindyn(68-80) Micromag(81-95) Particle(96-109) Imag.+Surface(110-113) Spinelectr(114-122) Theory+Micromag(123-131) Spinstr+Aniso(132-142) MagMat(143-156) Meas(157,158) MolMag+Kondo(159-162) Postdead(163-)
MA 20.108: Poster
Dienstag, 28. März 2006, 15:15–19:15, P1
Ion beam synthesis of Fe nanoparticles in MgO and YSZ — •kay potzger1, Helfried Reuther1, Shengqiang Zhou1, Arndt Mücklich1, Rainer Grötzschel1, Frank Eichhorn1, Maciej Oskar Liedke1, Jürgen Fassbender1, Hannes Lichte2, and Andreas Lenk2 — 1Institute of Ion Beam Physics and Materials Research, Forschungszentrum Rossendorf, P.O. box 510119, 01314 Dresden, Germany — 2Technical University Dresden, Institut für Strukturphysik, 01062 Dresden, Germany
In order to prepare epitaxially oriented Fe nanoparticles embedded below the surface of an oxide single crystalline host material the method of ion beam synthesis has been explored for MgO(001) and YSZ(001). At a fixed implantation energy and fluence the implantation temperature has been varied between *room temperature* and 1273 K. It was found, that for MgO substrates the fraction of metallic Fe increases up to a maximum of 60% (at 1073 K) as a function of implantation temperature, whilst the Fe depth profile remains the same. The Fe nanoparticles are nonmagnetic at room temperature exhibiting fcc structure. They show a mean diameter of 5 nm and an exclusive orientation relationship to the host. In YSZ the fraction of metallic Fe increases with increasing implantation temperature reaching 100% at 1273 K. However, the nanoparticles formed are of bcc structure with a mean diameter of 13 nm located mainly close to the sample surface. The ferromagnetic behavior is reflected by a magnetic hyperfine field of 330 kOe and a hysteretic magnetization reversal. Electron holography measurements have been carried out in order to visualize the stray field of the particles.