Cryogenic-free VSM and ETO measurement system – Quantum Design, VersaLab (VERSALAB)
Operational, 14.2.2020 09:12
CEITEC Nano - C1.56
The VersaLab is a cryogen-free physical property measurement system, suitable for magnetic and electrical characterization. It is a vibrating sample magnetometer (VSM) with an electrical transport option (ETO), capable to apply a magnetic field up to 3 tesla and over temperature range from 50 K up to 400 K. In addition, it has an oven option for the VSM to extend the temperature up to 1000 K.
Arregi, J. A.; Caha, O.; Uhlíř, V., 2020: Evolution of strain across the magnetostructural phase transition in epitaxial FeRh films on different substrates. PHYSICAL REVIEW B 101(17), p. 174413-1 - 174413-14, doi: 10.1103/PhysRevB.101.174413
(VERSALAB, MAGNETRON, RIGAKU9)
von Reppert, A.; Willig, L.; Pudell, J.-E.; Zeuschner, S. P.; Sellge, G.; Ganss, F.; Hellwig, O.; Arregi, J. A.; Uhlíř, V.; Crut, A.; Bargheer, M., 2020: Spin stress contribution to the lattice dynamics of FePt. SCIENCE ADVANCES 6(28), p. eaba1142-1 - eaba1142-7, doi: 10.1126/sciadv.aba1142
Uhlíř, V.; Pressacco, F.; Arregi, J. A.; Procházka, P.; Průša, S.; Potoček, M.; Šikola, T.; Čechal, J.; Bendounan, A.; Sirotti, F., 2020: Single-layer graphene on epitaxial FeRh thin films. APPLIED SURFACE SCIENCE 514, p. 145923-1 - 145923-7, doi: 10.1016/j.apsusc.2020.145923
(MAGNETRON, VERSALAB, RIGAKU9, UHV-LEEM, UHV-LEIS, UHV-SPM, UHV-PREPARATION, UHV-XPS, SIMS)
The VersaLab VSM option is a fast and sensitive DC magnetometer that consists primarily of a linear motor transport (VSM head) for vibrating the sample and a coil set for detection (pickup coil). The basic measurement is performed by oscillating the sample near the pickup coil and synchronously detecting the voltage induced. With a relatively large oscillation amplitude (1–3 mm peak) and a frequency of 40 Hz, the system can resolve magnetization changes of less than 1 µemu with 1 s data averaging. Two coilset pucks are available for different sample sizes. In case of flat samples (films), measurements in both in-plane and out-of-plane configurations are possible. For most uses, the standard coilset puck provides the best trade-off between sensitivity and accuracy. The sensitivity is not significantly affected by large magnetic fields, so the VSM can perform sensitive measurements up to the maximum field of 3 T. The standard working temperature range of the VersaLab (50–400 K) could be extended for the VSM option up to 1000 K thanks to the Oven kit, for which it is necessary to use a special sample holder.
The VersaLab ETO supports three types of measurements: resistance, IV curves and differential resistance, over a wide range of resistance values and sample types. Measurements are usually made by applying a sinusoidal AC drive current and measuring the AC voltage response. However, a special 2-wire high resistance mode is available where an AC voltage is applied, and the AC current response is measured with a current amplifier. The ETO’s current source has a range from 1 nA to a maximum current of 100 mA, and it is capable of supplying both DC and AC current with frequencies from 0.1 Hz to 200 Hz. Three preamplifiers in conjunction with the current source get the ETO a noise floor of 10 nΩ and allow measurements of resistances up to 5 GΩ.
Samples should have a maximum size in the XY plane of 4 mm (7 mm) for the small (big) coilset. The exact mounting of the sample depends on the experiment and can be user-defined.
|RMS sensitivity||< 1 µemu with 1 sec averaging|
|Sample size in XY plane||4 mm for standard coilset and 7 mm for big coilset|
|Position in Z axis||35 mm from the bottom|
|Temperature range||50 K to 400 K, and up to 1000 K with Oven kit|
|Magnetic field range||3 T max.|
|Sensitivity||1 nV at 100 mA|
|Resolution||10 nW at 100 mA|
|DC and AC drive amplitude||10 nA to 100 mA|
|Resistance range||10 µΩ to 5 GΩ|
|Temperature range||50 K to 400 K|
|Magnetic field range||3 T max.|