The DESY Nanolab offers access to a Cryogen Free Measurement System (CFMS) for the characterization of various physical properties over a wide range of temperature and field.
Physical Properties Measurement System (PPMS)
Responsible: Dr. C. Strohm - FS-PS
Superconducting Magnet
Filed range: ±14 T, 20 bit resolution
Homogeneity: 0.1 % over 1 cm x dia. 1 cm
Persistent mode decay rate 10 ppm/hour
Ultra low field option: 4 quadrant power supply for ± 30 mT, continuous sweeps across 0 T.
Sample Cryostat - Variable Temperature Insert
Temperature range: 2 K - 400 K
Cool-down time to 2K: approx. 60 min.
Vibrating Sample Magnetometer
Frequency: typically 20 Hz
Sample size: 5 mm or smaller
Noise and resolution: few x 10-6 emu
Cooling: sample in static He exchange gas
AC Susceptibility
Frequency: 1 Hz – 20 Hz
Maximum AC field 20 Gauss @ 100 Hz
Nominal sensitivity: 10-7 emu at 4 K
Sample size: 5 mm or smaller
Cooling: sample in static He exchange gas
AC and DC Resistivity and Hall Effect
Samples size: max 5 mm x 10 mm
DC current supply (Keithley 2400): 1 nA – 1 A
DC resistance measurement: 100 nW – 1 GW
Voltage sensitivity (Keithley 2182): 10 nV – 100 V
Frequency range AC: 1 mHz – 100 kHz
Current source range AC: 2 pA – 100 mA
Voltage measurement range AC: 10 nV – 1 V
Geometry: parallel and perpendicular to field
Cooling: sample in static He exchange gas
AC Calorimetry
Heat capacity resolution: 1 nJ/K at 2 K
Sample dimensions (typ.): 100 mm x 200 mm
Cooling: sample on membrane in static He exchange gas.
Thermal Transport
Thermocouple based thermal transport and thermoelectric effect measurements.
Needs significant preparation effort and change of sample cryostat configuration.
Cooling: sample in vacuum calorimeter placed in He flow of VTI.
| Contact |
|
Dr. C. Strohm - +49 (0)40 8998 2805 |
Magnetic Microscopy
Responsible: Dr. L. Bocklage, FS-PS
The DESY NanoLab offers access to an Evico Magnetics Optical Kerr microscope:
Magneto-Optical Domain Imaging and Magnetometry
Applications:
Measurement of magnetic hysteresis of thin films, micro- and nanoelements.
Magnetic domain imaging of thin films, micro- and nanoelemente
Optics
Reflection geometry
Objectives with magnification: 20x, 50x, and 100x
Optical resolution: 300 nm
Magneto-optical Kerr effect: Polar, longitudinal and transversal MOKE contrast
Sample Environment
Typical sample sizes < 35 mm
Piezo-based drift correction to improve magnetic domain imaging
Magnetic Field Options
Quadrupole magnet for in-plane magnetic fields up to 700 mT depending on sample size
Perpendicular coil for out-of-plane magnetic fields up to 100 mT
DC and AC magnetic field modes
Post Processing
Software for magnetic hysteresis curve evaluation
| Contact |
|
Dr. Lars Bocklage - +49 (0)40 8998 2857 |
