Magneto-transport

Electronic & Chemical & Magnetic Characterization (Magnetic characterisation)

The facility consists of a variable temperature, liquid helium-cooled magneto-transport equipment for electrical characterization by Oxford Instruments (T in the 1.5 – 400 K range, magnetic field up to +-7 T). It has capabilities for 2-point or 4-point measurements, for Hall effect measurements in the Van der Pauw and Hall bar geometries, as well as I-V and C-V characteristics. Additional electrical contacts allow application of gate biases for sample polarization, and illumination through diodes of chosen wavelength. Samples up to 7 X 4 mm^2 size are fitted in a 16-pin dual-in-line socket, which can be placed perpendicular or parallel to the magnetic field. Larger samples can be accommodated if needed. All 16 electrical connections can be independently and automatically switched through a matrix switch unit. Samples with a wide range of resistivities can be measured, ranging from diluted 2D electron gases in semiconductors to metals. It is possible to record sweeps of gate voltages and magnetic fields (for, e.g., the observation of Shubnikov–de Haas oscillations / Quantum Hall effect in semiconductor 2D systems), as well as temperature. All experiments are operated through a user-friendly LabView interface, which allows control of temperature, magnetic field and electrical connections.

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          provided at NFFA-Europe laboratories by:
CNR-IOM (TS)
Italy
CSIC-ICMAB
Spain
INESC-MN
Portugal
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          provided by:
EURONANOLAB
France
CNR-IOM (TS)
Italy
Magneto-transport
Magneto-transport characterisation, electrical characteristics
Superconducting magnet
0-7T
2-point or 4-point measurements, constant current application, voltage detection with lock-in amplifier
Up to 7 X 4 mm2 size in a 16-pin dual-in-line socket, Van der Pauw and Hall bar geometries Temperature: 1.5-400K
CSIC-ICMAB
Spain
Magneto Transport
Magnetic field and/or temperature dependence of electrical resistivity
H=0 to ±90kOe
1 mOhm – 10 MOhm
0-360° sample rotation respect to magnetic field
Thin films up to 5x5mm2 or pellets or bulk samples up to 10x10mm2 T=2K to 400K
10 torr He atmosphere