Regensburg 2019 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 62: Direct-Write Nanofabrication and Applications III
(Electron Beam Induced Processing) (joint session DS/TT)
TT 62.3: Vortrag
Donnerstag, 4. April 2019, 15:45–16:00, H32
Post-growth electron beam irradiation of co-deposited PtC-FeCo FEBID nanostructures — •Roland Sachser and Michael Huth — Physikalisches Institut, Goethe-University, Frankfurt am Main, Germany
FEBID using the precursor (CH3)3CH3C5H4Pt leads to low conductive, nanogranular samples. The resistivity is determined by the coupling of Pt nanocrystals by the carbonaceous matrix. This matrix, and thus the conductivity, can be strongly influenced by post-growth electron beam irradiation. On the other hand, deposits prepared employing the precursor HFeCo3(CO)12 feature high metal contents and metallic resistivity behavior. These samples are ferromagnetic but the tunability of their transport properties by post-growth treatments is limited. By co-deposition using both precursors under well-controlled mixing ratios it is possible to obtain a highly tunable granular ferromagnet. Granular ferromagnetic systems are known to show an enhanced anomalous Hall effect, which can also be observed in our deposits that are treated by post-growth electron beam irradiation under in situ conductance monitoring. The conductance can be tuned over a wide range, which is also prominently reflected in the magneto-transport properties that can be directly monitored in situ in the low field regime at room temperature. Complementary low temperature magneto-transport measurements reveal the optimal post-growth irradiation dose to obtain the largest anomalous Hall effect.