Research
Facilities
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Homemade VT-MFM with in
situ
high magnetic/electric fields
We constructed a Variable Tempearture-Magnetic Force
Microscope
(VT-MFM) is capable of high resolution (50-100 nm) magnetic
imaging in
a wide temperature range (3-300 K) at high magnetic field (up to 8
tesla). Recently, we demonstrated magnetic imaging with in
situ high
voltage
(~1 kV). We adopted the Pan's walkder design for coarse approach
mechanism
(Z positioner). This microscope uses piezoresistive cantilever
coated
with magnetic metal as magnetic sensor. This instrument has been
used
for magnetic imaging of a few systems, e.g. mutiferroic materials,
complex oxide thin films and signel crystals.
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MFM
inside
8 T magnet
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MFM
head
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An ultra-high-vacuum
low
temperature
scanning tunnerling
microscope (UHV-LT-STM) from Omicron
Nanotechnology has been installed
in our SPM lab. The system consists of a LT-STM analysis
chamber
and a load-lock (FEL). The base pressure of the ananlysis chamber
is
below
1E-11 mbar. The base temperature is 4.6 K. The initial tests
demonstrate that our STM is able to obtain atomic images on Au
(111),
NbSe2, and more recently on topological insulator Bi2Se3.
A
dedicate preparation chamber for in
situ tip and surface preparation is installed.
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10 nm X 10 nm |
10 nm X
10 nm
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20 nm X 20 nm |
UHV-LT-STM
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Au (111) Herringbone
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CDW
in
NbSe2
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Defects in Bi2Se3
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