Application & Results

A selection of numerous high quality results obtained with UNISOKU systems. Most of the excellent pieces of work have been provided by customers to whom we express our acknowledgement of gratitude.

UHV Low Temperature JT-SPM

STM measurements on Au(111) @ 1.2 K

10_au111_topo

STM Topography
54nm x 54nm
Herringbone structure

10_au111_didv

Spectroscopy
di/dv image resolving the surface state
images by courtesy of SPECS GmbH, Berlin

STM on K2PTCDA Molecules on Ag(111)

stm-k2ptcda

a)* STM image with a tungsten tip
b) _Calculated STM image for comparison
c)* ST[H]M image by applying the “Hydrogen STM” method reveals even more detail of the molecular structure

)* Courtesy of Christian Zwick and Torsten Fritz, Friedrich Schiller University Jena
Published in ACS Nano, 2016 Jan 26. [Epub ahead of print http://www.ncbi.nlm.nih.gov/pubmed/26718635]
Complex Stoichiometry-Dependent Reordering of 3,4,9,10-Perylenetetracarboxylic Dianhydride on Ag(111) upon K Intercalation, C.Zwick, A.Baby, M.Gruenewald, E.Verwüster, O.T.Hofmann, R.Forker, G.Fratesi, G.P.Brivio, E.Zojer, and T.Fritz
Reproduced under Creative Commons Attribution (CC-BY) License
http://pubs.acs.org/page/policy/authorchoice_ccby_termsofuse.html

High Performance AFM on Au(111)

10_afm_topo

Non-contact AFM topography
High scan speed 16nm/s

Multi Mode Non-Contact AFM

10_afm_4ch

AFM regulated on df = const.
Scan speed 16nm/s

Z topographic channel
df error signal
It simultaneous tunnelling current map
and simultaneous excitation signal map

images by courtesy of SPECS GmbH, Berlin

back to the instrument JT-SPM

UHV LT STM System USM1200

STM Topographic Image of Si (100)

Temperature: 63K
Field of View: 3nm × 3nm
Dr. YOKOYAMA
in Yokohama city Univ.

STM Molecular Structure and Topographic Image of COOH-Porphyrin-tetramer

Temperature: 63K
Field of View: 11nm × 11nm
Dr. YOKOYAMA
in Yokohama city Univ.

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UHV ULT and High Magnetic Field STM System USM1300

3D Vector Magnet Application:
Spin Transitions of a Single Fe Atom

STM at 500mK on single Fe atoms on a Cu₂N layer on Cu(100)

loth_single_fe_folie1

IETSpectra at magnetic fields of 0T and 2T along the symmetry axes reveal the spin transitions of a single Fe atom.
(step position corresponds to excitation energy; step height to the intensity of the transition)

loth_single_fe_folie2

left: depicts the rotation plane of the field vector;
right: excitation energy vs. angle of rotation.

Colour indicates intensity:
strong asymmetry in the yz-plane
no asymmetry in the xy-plane.

The asymmetric behaviour of the spin states relates to the direction of the neighbouring N-atoms.
Courtesy of Sebastian Loth, Max Planck Institute for Structure + Dynamics of Matter, Hamburg.
Three-Dimensional Mapping of Single-Atom Magnetic Anisotropy
Shichao Yan et al. Nano Lett. (2015), 15, 1938−1942
http://pubs.acs.org/doi/abs/10.1021/nl504779p

STM Topographic Image of Vortex Lattice of a Superconductor NbSe₂

Temperature: 400mK
Field: 0.5T
Environment: UHV
Field of View: 250nm × 250nm
Dr. HANAGURI
in Magnetic Materials Laboratory, RIKEN

STM Topographic Image and STS Data of Cleaved NBS₂

Temperature: 440mK
Field of View: 7.3nm × 7.3nm
Dr. HANAGURI
in Magnetic Materials Laboratory, RIKEN

STM topographic image in 11Tesla at 400mK by USM1300S 3He

Scan size: 11.7nm
Sample bias: 2.07V
Tunnel current: 740pA

Si (001) STM topographic image by USM1300S ³He

Add the atomic structure model
N type Si (100), 0.008 ~ 0.015Ωcm
V=+1.7V, I=70pA, 668.7mK
Keisuke Sagisaka, NIMS, Fujita group
published in VOLUME 91, NUMBER 14, 146103, PHYSICAL REVIEW LETTERS

Standing wave on Cu (111) surface by USM1300

Yukio Hasegawa group
Univ. of Tokyo, Solid state physics

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UHV LT SPM System USM1400

Naphthalene Molecules on HOPG: Tunneling Spectroscopy

a) HOPG substrate
b) (2√3×2√3) R30° Naphthalene layer
c) Multilayer of Naphthalene
Osaka University
T. Yamada et al, J. of Phys. Chem. C 118,1045 (2014)
http://pubs.acs.org/doi/abs/10.1021/jp4097875

STM Topographic Image of Si (111) Surface

Temperature: 83K
Scan area: 22nm × 22nm
Sample bias: 1.8V
Tunnel current: 0.54nA
Yuko Yamamoto
Unisoku Co., Ltd.

STM Topographic Image of Si(100) Surface

Temperature: 83K
Scan area: 12nm × 5nm
Sample bias: 1.2V
Tunnel current: 1.0nA
Yuko Yamamoto
Unisoku Co., Ltd.

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UHV LT-SPM and Raman System USM1400-TERS

Tip Enhanced Raman Spectroscopy (TERS)

results_ters1400

Experimental set up
Intensity enhancement by near-field effect

Single Molecule TERS Spectra

single_molecule_ters

Local Raman Spectroscopy
top: spectra of a single H2TBPP molecule
middle: spatial distribution of spectral band
bottom: calculated spatial distribution
Z.C. Dong (Hefei National Laboratory for Physical Sciences at the Microscale)
Nature 498, 82–86 (06 June 2013) doi:10.1038/nature12151
http://www.nature.com/nature/journal/v498/n7452/full/nature12151.html

Proof of Single Molecule Resolution

result_proof_single_molecule

Left: STM topographic image of an alternating chain of ZnTBPP (red) and H2TBPP (blue) molecules on Ag
Right: local Raman spectra at the locations as indicated by the numbers revealing a clear separation between neighbouring molecules.
Spectra at top and bottom labelled with DFT are calculated for comparison

S.Jiang + Z.C.Dong et al Nature Nanotechnology 10, 865–869 (2015)
http://www.nature.com/nnano/journal/v10/n10/abs/nnano.2015.170.html

back to the instrument USM1400-TERS