Studies of Nanoconstrictions, Nanowires and Fe3O4 Thin Films: Electrical Conduction and Magnetic Properties. Fabrication by Focused Electron/Ion Beam

ISBN-13: 9783642158001 / Angielski / Twarda / 2011 / 188 str.

Amalio Fernandez-Pacheco

Opis

This work constitutes a detailed study of electrical and magnetic properties in nanometric materials with a range of scales: atomic-sized nanoconstrictions, micro- and nanowires and thin films. Firstly, a novel method of fabricating atomic-sized constrictions in metals is presented; it relies on measuring the conduction of the device while a focused-ion-beam etching process is in progress.

Spis treści

Introduction.- Experimental Techniques.- Conduction in in Atomic-Sized Magnetic Metallic Constructions created by FIB.- Pt-C Nanowires created by FIBID and FEBID.- Superconductor W-Based Nanowires created by FIBID.- Magnetic Cobalt Nanowires created by FEBID.- Conclusions and Outlook.- CV.-

Blurb

This work constitutes a detailed study of electrical and magnetic properties in nanometric materials with a range of scales: atomic-sized nanoconstrictions, micro- and nanowires and thin films. Firstly, a novel method of fabricating atomic-sized constrictions in metals is presented; it relies on measuring the conduction of the device while a focused-ion-beam etching process is in progress. Secondly, it describes wires created by a very promising nanolithography technique: Focused electron/ion-beam-induced deposition. Three different gas precursors were used: (CH₃)₃Pt(CpCH₃), W(CO)₆ and Co₂(CO)₈. The thesis reports the results obtained for various physical phenomena: the metal-insulator transition, superconducting and magnetic properties, respectively. Finally, the detailed magnetotransport properties in epitaxial Fe₃O₄ thin films grown on MgO (001) are presented. Overall, the new approaches developed in this thesis have great potential for supporting novel technologies.