Scanning Probe Microscopy

Hermann, B. A.; Hoffmann‐Vogel, Regina

doi:10.1002/9783527644131.ch11

Cited by 2 publications

(2 citation statements)

References 193 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, metamaterial-based magnetic nanostructures open up new possibilities of exploring the optical magnetic field -matter interactions. In our pursuit to develop future tools to investigate optical magnetic interactions, it is of particular interest to explore the concept of photo-induced magnetic nanoprobes (i.e., working at optical frequencies) that can be used in scanning probe microscopy (SPM) [14]- [18]. Some recent research focused on the enhancement of magnetic field near nano-apertures to record the spatial distribution of magnetic fields within magnetic nanostructures [19], [20].…”

Section: Introductionmentioning

confidence: 99%

Photoinduced magnetic force between nanostructures

et al. 2015

View full text Add to dashboard Cite

Photoinduced magnetic force between nanostructures, at optical frequencies, is investigated theoretically. Till now optical magnetic effects were not used in scanning probe microscopy because of the vanishing natural magnetism with increasing frequency. On the other hand, artificial magnetism in engineered nanostructures led to the development of measurable optical magnetism. Here two examples of nanoprobes that are able to generate strong magnetic dipolar fields at optical frequency are investigated: first, an ideal magnetically polarizable nanosphere and then a circular cluster of silver nanospheres that has a looplike collective plasmonic resonance equivalent to a magnetic dipole. Magnetic forces are evaluated based on nanostructure polarizabilities, i.e., induced magnetic dipoles, and magnetic-near field evaluations. As an initial assessment on the possibility of a magnetic nanoprobe to detect magnetic forces, we consider two identical magnetically polarizable nanoprobes and observe magnetic forces on the order of piconewtons, thereby bringing it within detection limits of conventional atomic force microscopes at ambient pressure and temperature. The detection of magnetic force is a promising method in studying optical magnetic transitions that can be the basis of innovative spectroscopy applications.

show abstract

Section: Introductionmentioning

confidence: 99%

Photoinduced magnetic force between nanostructures

et al. 2015

View full text Add to dashboard Cite

show abstract

“…In addition, SFM is ideally suited to study insulating surfaces with atomic resolution [23][24][25]. This method also provides molecular resolution not only on metals [26,27], but also on bulk insulators [28][29][30][31][32][33], for an overview, see also [34,35]. If stiff force sensors and small oscillation amplitudes are used, the method even yields atomic resolution on molecules [36,37].…”

Section: Introductionmentioning

confidence: 99%

Imaging prototypical aromatic molecules on insulating surfaces: a review

Hoffmann‐Vogel

2017

Rep. Prog. Phys.

View full text Add to dashboard Cite

Insulating substrates allow for in-plane contacted molecular electronics devices where the molecule is in contact with the insulator. For the development of such devices it is important to understand the interaction of molecules with insulating surfaces. As substrates, ionic crystals such as KBr, KCl, NaCl and CaF are discussed. The surface energies of these substrates are small and as a consequence intrinsic properties of the molecules, such as molecule-molecule interaction, become more important relative to interactions with the substrates. As prototypical molecules, three variants of graphene-related molecules are used, pentacene, [Formula: see text] and PTCDA. Pentacene is a good candidate for molecular electronics applications due to its high charge carrier mobility. It shows mainly an upright standing growth mode and the morphology of the islands is strongly influenced by dewetting. A new second flat-lying phase of the molecule has been observed. Studying the local work function using the Kelvin method reveals details such as line defects in the center of islands. The local work function differences between the upright-standing and flat-lying phase can only be explained by charge transfer that is unusual on ionic crystalline surfaces. [Formula: see text] nucleation and growth is explained by loosely bound molecules at kink sites as nucleation sites. The stability of [Formula: see text] islands as a function of magic numbers is investigated. Peculiar island shapes are obtained from unusual dewetting processes already at work during growth, where molecules 'climb' to the second molecular layer. PTCDA is a prototypical semiconducting molecule with strong quadrupole moment. It grows in the form of elongated islands where the top and the facets can be molecularly resolved. In this way the precise molecular arrangement in the islands is revealed.

show abstract

Scanning Probe Microscopy

Cited by 2 publications

References 193 publications

Photoinduced magnetic force between nanostructures

Photoinduced magnetic force between nanostructures

Imaging prototypical aromatic molecules on insulating surfaces: a review

Contact Info

Product

Resources

About