THU2F3 Magnetism - Magnetic Nanoparticles and Nanowires by mercy2beans122


									                                                                                                        Thursday – Aula 3

                      THU2F3: Magnetism - Magnetic Nanoparticles and Nanowires
                                            Chaired by D. Fiorani, ISM-CNR, Roma, Italy

Time: Thursday 11:30–12:50                                                                                   Location: Aula 3

                                   THU2F3.1     11:30   Aula 3     Morphological and magnetic characterization of Ni
Characterization of interactions and switching be-                 nanoparticles films — •Sergio D’Addato1,2 , Luca
havior in particulate magnetic materials by scalar                 Gragnaniello1,2 , Alessandro di Bona1 , Alberto
and vector (rotational) first-order reversal curves                 Rota1 , Sergio Valeri1,2 , Franco Ronconi3 , and Fed-
(FORC) diagrams — •Laurentiu Stoleriu1 , Alexan-                   erico Spizzo3 — 1 INFM-CNR, S3 Research Centre, via
dru Stancu1 , and Petru Andrei2 — 1 Department of                  G. Campi 213/a, 41100 Modena, Italy — 2 Dipartimento di
Physics, Alexandru Ioan Cuza University, Blvd. Carol I, 11,                         a
                                                                   Fisica, Universit` di Modena e Reggio Emilia, via G. Campi
Iasi, Romania — 2 Department of Electrical and Computer            213/a, 41100 Modena, Italy — 3 Dipartimento di Fisica, Uni-
Engineering, Florida State University and Florida A&M                    a
                                                                   versit` di Ferrara, via G. Saragat 1, 44100 Ferrara, Italy
University, Tallahassee, FL, USA                                   We present the results of a morphological and magnetic
One presents a comparative study of the physical meanings          study of Ni nanoparticles ultrathin films. The films grow
of data extracted from the scalar FORC diagrams and the            in random paving mode, with evidence of two regimes: col-
newly-introduced vector FORC diagram, measured on the              lective blocking (T<70 K) and reversibility (T>70 K).
rotational hysteresis describing a material’s vector switching
                                                                                                     THU2F3.4   12:30   Aula 3
                                                                   Coercivity drop in exchange biased Co nanowires in-
                                   THU2F3.2     11:50   Aula 3     duced by antiferromagnetic fluctuations — •Thomas
Correlation of structural and magnetic properties                  Maurer1 , Frederic Ott1 , Gregory Chaboussant1 ,
                                                                                 ´ ´               ´
of size-selected FeCo alloy nanoparticles on sur-                  Yaghoub Soumare2 , Jean-Yves Piquemal2 , and Guil-
faces — •Mathias Getzlaff1 , Furkan Bulut1 , Wolf-                 laume Viau3 — 1 Laboratoire L´on Brillouin CEA/CNRS
gang Rosellen1 , Renate Kerstin Gebhardt1 , Armin                  UMR12 , Centre d’Etudes de Saclay, 91191 Gif sur Yvette,
Kleibert2 , Karl-Heinz Meiwes-Broer2 , and Joachim                 France — 2 ITODYS Universit´ Paris 7- Denis Diderot,
Bansmann3 — 1 University of D¨sseldorf, D-40225 D¨ssel-
                                u                  u               UMR CNRS 7086 2, place Jussieu 75251 cedex 05 Paris,
dorf, Germany — 2 University of Rostock, D-18051 Rostock,          France — 3 Laboratoire de Physique et Chimie des Nano-
Germany — 3 University of Ulm, D-89069 Ulm, Germany                Objets, INSA de Toulouse, UMR CNRS 5215, 135 av. de
Size-selected softmagnetic FeCo alloy clusters are deposited       Rangueil 31077 Toulouse Cedex 4, France
under soft-landing and ultrahigh vacuum conditions on var-         The magnetic propeties of oxidized ferromagnetic Co-Ni
ious surfaces. Thus, we are able to correlate the structural       nanowires have been investigated. The temperature depen-
and element-specific magnetic properties of the nanoparti-          dence of the coercive and exchange bias fields shows the
cles using STM and XMCD.                                           correlation of exchange bias and superparamagnetic fluctu-
                                                                   ations of antiferromagnetic CoO grains.
                                   THU2F3.3     12:10   Aula 3

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