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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 20.101: Poster

Dienstag, 28. März 2006, 15:15–19:15, P1

Exchange spring behaviour of magnetic nanoclusters embedded in a soft magnetic matrix — •Dmitrij N. Ievlev, Alexey N. Dobrynin, Christian Hendrich, Kristiaan Temst, and Peter Lievens — Laboratorium voor Vaste-Stoffysica en Magnetisme, Katholieke Universiteit Leuven, B-3001 Leuven, Belgium

We have investigated the magnetization behaviour of Co nanoclusters embedded in a soft magnetic matrix (Fe, permalloy) at different temperatures from 300 K down to 5 K. Magnetic nanoclusters with average size between 2.0 and 2.5 nm were produced in a laser vaporization cluster source and co-deposited with magnetically soft matrix material at low kinetic energy (<1 eV/atom) at UHV conditions. The cluster size distribution was monitored by time-of-flight mass spectrometry in beam, and with transmission electron microscopy and small angle x-ray scattering after deposition. For certain nanocluster concentrations smooth hysteresis curves were observed, indicating good exchange coupling between the magnetically hard nanoclusters and magnetically soft matrix material. Dependences of coercivity on cluster concentration were investigated at low and high temperatures.