Dresden 2014 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 9: Magnetic Nanoparticles
MA 9.2: Vortrag
Montag, 31. März 2014, 15:15–15:30, HSZ 401
Magnetic Properties of FePt and FePt@MnO Heterodimer Nanoparticles and their self assemblies — •Alice Klapper1, Sabrina Disch2, Xiao Sun1, Ulrich Rücker1, Oskar Köhler3, Heiko Bauer3, Wolgang Tremel3, Oleg Petracic1, and Thomas Brückel1 — 1Jülich Centre for Neutron Science JCNS and Peter Grünberg Institut PGI, JARA-FIT, Forschungszentrum Jülich GmbH, 52425 Jülich, GERMANY — 2Institut Laue-Langevin, F-38042 Grenoble Cedex 9, FRANCE — 3Institut für Anorganische und Analytische Chemie, Johannes Gutenberg-Universität Mainz, 55099 Mainz, GERMANY
On the length scale of few nanometers, surface effects are not negligible and therefore play an important role for the magnetic behavior of nanoparticles (NP). In this work we investigate the magnetic properties of FePt NP and the change of these properties due to an exchange interaction with an attached antiferromagnetic NP, i.e. FePt@MnO heterodimer NP. The connection of the two NP lead to an increase of the blocking temperature compared to the FePt NP proven by ZFC curves obtained from SQUID measurements. Polarized SANS measurements in a magnetic field have been performed to measure the magnetic form factor of the NP. To investigate the ordering phenomenon and interaction between the NP the samples under study have been deposited on silicon substrates. The self-assembly was studied using AFM and GISAXS instruments. While the FePt NP show a long range ordered structure the heterodimer NP order in a short range structure which is dominated by the larger part of the dimer, i.e. the MnO NP.