Magnetic characterization of cobalt nanowires and square nanorings fabricated by focused electron beam induced deposition

Federico Venturi, Gian Carlo Gazzadi, Amir H. Tavabi, Alberto Rota, Rafal E. Dunin-Borkowski and Stefano Frabboni

Beilstein J. Nanotechnol. 2018, 9, 1040–1049. https://doi.org/10.3762/bjnano.9.97

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Federico Venturi, Gian Carlo Gazzadi, Amir H. Tavabi, Alberto Rota, Rafal E. Dunin-Borkowski and Stefano Frabboni

Beilstein J. Nanotechnol. 2018, 9, 1040–1049. https://doi.org/10.3762/bjnano.9.97

How to Cite

Venturi, F.; Gazzadi, G. C.; Tavabi, A. H.; Rota, A.; Dunin-Borkowski, R. E.; Frabboni, S. Beilstein J. Nanotechnol. 2018, 9, 1040–1049. doi:10.3762/bjnano.9.97

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TY  - JOUR
A1  - Venturi, Federico
A1  - Gazzadi, Gian Carlo
A1  - Tavabi, Amir H.
A1  - Rota, Alberto
A1  - Dunin-Borkowski, Rafal E.
A1  - Frabboni, Stefano
T1  - Magnetic characterization of cobalt nanowires and square nanorings fabricated by focused electron beam induced deposition
JF  - Beilstein Journal of Nanotechnology
PY  - 2018///
VL  - 9
SP  - 1040
EP  - 1049
SN  - 2190-4286
DO  - 10.3762/bjnano.9.97
PB  - Beilstein-Institut
JA  - Beilstein J. Nanotechnol.
UR  - https://doi.org/10.3762/bjnano.9.97
KW  - focused electron beam induced deposition
KW  - magnetic force microscopy
KW  - magnetic nanostructures
KW  - off-axis electron holography
KW  - transmission electron microscopy
N2  - The magnetic properties of nanowires (NWs) and square nanorings, which were deposited by focused electron beam induced deposition (FEBID) of a Co carbonyl precursor, are studied using off-axis electron holography (EH), Lorentz transmission electron microscopy (L-TEM) and magnetic force microscopy (MFM). EH shows that NWs deposited using beam energies of 5 and 15 keV have the characteristics of magnetic dipoles, with larger magnetic moments observed for NWs deposited at lower energy. L-TEM is used to image magnetic domain walls in NWs and nanorings and their motion as a function of applied magnetic field. The NWs are found to have almost square hysteresis loops, with coercivities of ca. 10 mT. The nanorings show two different magnetization states: for low values of the applied in-plane field (0.02 T) a horseshoe state is observed using L-TEM, while for higher values of the applied in-plane field (0.3 T) an onion state is observed at remanence using L-TEM and MFM. Our results confirm the suitability of FEBID for nanofabrication of magnetic structures and demonstrate the versatility of TEM techniques for the study and manipulation of magnetic domain walls in nanostructures.
ER  -

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