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FEBID fabrication and magnetic characterization of individual nano-scale and micro-scale Co structures

100%

Idigoras O., Nikulina E., Porro J. M., Vavassori P., Chuvilin A., Berger A.

Nanofabrication

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2014

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vol. 1

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issue 1

EN

This work gives an illustration of the viability of FEBID to fabricate magnetic nano- and micro-structures and it demonstrates that by means of a combination of MOKE microscopy and MFM, one is able to analyze the size and shape effects in individual magnetic cobalt structures. With the help of our magnetic and functional study, we are able to demonstrate that by using FEBID, cobalt of uniform thickness and magnetic response can be deposited over several micron-size areas, establishing a most crucial ingredient of reliable structure and device fabrication. Furthermore, we show the suitability of FEBID to fabricate functional and complex 3-dimensional magnetic structures. The issue of unintended secondary deposits in FEBID is discussed, and a Xe-ion milling posttreatment for its removal is proposed and demonstrated as a successful pathway towards the fabrication of functionally independent magnetic nano-structures.

2

Focused Ion Beam nano-patterning from traditional applications to single ion implantation perspectives

80%

Gierak J.

Nanofabrication

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2014

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vol. 1

|

issue 1

EN

In this article we review some fundamentals of the Focused Ion Beam (FIB) technique based on scanning finely focused beams of gallium ions over a sample to perform direct writing. We analyse the main limitations of this technique in terms of damage generation or local contamination and through selected examples we discuss the potential of this technique in the light of the most sensitive analysis techniques. In particular we analyse the limits of Ga-FIB irradiation for the patterning of III-V heterostructures, thin magnetic layers, artificial defects fabricated onto graphite or graphene and atomically thin suspended membranes. We show that many of these earlypointed “limitations” with appropriate attention and analysis can be valuable for FIB instrument development, avoided, or even turned into decisive advantages. Such new methods transferable to the fabrication of devices or surface functionalities are urgently required in the emerging nanosciences applications and markets.

3

Nanofabrication techniques of highly organized monolayers sandwiched between two electrodes for molecular electronics

80%

Cea P., Ballesteros L. M., Martín S.

Nanofabrication

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2014

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vol. 1

|

issue 1

EN

It is expected that molecular electronics, i.e., the use of molecules as critical functional elements in electronic devices, will lead in the near future to an industrial exploitable novel technology, which will open new routes to high value-added electronic products. However, despite the enormous advances in this field several scientific and technological challenges should be surmounted before molecular electronics can be implemented in the market. Among these challenges are the fabrication of reliable, robust and uniform contacts between molecules and electrodes, the deposition of the second (top) contact electrode, and development of assembly strategies for precise placement of molecular materials within device structures. This review covers advances in nanofabrication techniques used for the assembly of monomolecular films onto conducting or semiconducting substrates as well as recent methods developed for the deposition of the top contact electrode highlighting the advantages and limitations of the several approaches used in the literature. This contribution also aims to define areas of outstanding challenges in the nanofabrication of monomolecular layers sandwiched between two electrodes and opportunities for future research and applications.

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3 Nanofabrication

3 2014

1 Ballesteros L. M.

1 Berger A.

1 Cea P.

1 Chuvilin A.

1 Gierak J.

1 Idigoras O.

1 Martín S.

1 Nikulina E.

1 Porro J. M.

1 Vavassori P.

FEBID fabrication and magnetic characterization of individual nano-scale and micro-scale Co structures

Focused Ion Beam nano-patterning from traditional applications to single ion implantation perspectives

Nanofabrication techniques of highly organized monolayers sandwiched between two electrodes for molecular electronics