Low Temperature Vibrating Sample Magnetometr Cryogenic Limited (CRYOGENIC)
Operational, 11.8.2020 07:38
CEITEC Nano - C1.56
30.9. 09:00 - 12:00: CRYOGENIC DCR - Cryogenic DCR training. In case you are interested in a training and the limit is full, please contact the guarantor.
The Cryogen-Free High Field Measurement System combines the latest cryogen-free technology with sophisticated measurement techniques providing a versatile, powerful investigative device achieving low temperatures and high magnetic fields without the use of liquid helium or nitrogen.
It is comprised of the following main components:
· A cryostat incorporating a cryocooler, superconducting magnet and a variable temperature sample space
· Rack incorporating electronics for control and monitoring of the cryostat and any measurement options
· Measurement system software
· Sample probes
· Measurement options
The cryogen-free magnet system allows the experimenter to achieve low temperatures 1.6K – 300K while applying magnetic fields up to 9T to their samples. The cryocooler provides the cooling to both the magnet and the variable temperature insert (VTI).
Rienks, E. D. L.; Wimmer, S.; Sánchez-Barriga, J.; Caha, O.; Mandal, P. S.; Růžička, J.; Ney, A.; Steiner, H.; Volobuev, V. V.; Groiss, H.; Albu, M.; Kothleitner, G.; Michalička, J.; Khan, S. A.; Minár, J.; Ebert, H.; Bauer, G.; Freyse, F.; Varykhalov, A.; Rader, O.; Springholz, G., 2019: Large magnetic gap at the Dirac point in Bi2Te3/MnBi2Te4 heterostructures. NATURE 576(7787), p. 423 - 428, doi: 10.1038/s41586-019-1826-7
(CRYOGENIC, TITAN, HELIOS, RIGAKU9)
Hajduček, J., 2019: Substrate-controlled nucleation of the magnetic phase transtition in nanostructures. BACHELOR´S THESIS , p. 1 - 46
(MAGNETRON, ICON-SPM, CRYOGENIC, MIRA, RIE-FLUORINE, EVAPORATOR)
Motyčková, L., 2018: Epitaxial growth and characterization of metamagnetic nanoparticles for biomedical applications. BACHELOR´S THESIS , p. 1 - 55
(MAGNETRON, ICON-SPM, LYRA, CRYOGENIC)
Friš, P.; Munzar, D.; Caha, O.; Dubroka, A., 2018: Direct observation of double exchange in ferromagnetic La0.7Sr0.3CoO3 by broadband ellipsometry. PHYSICAL REVIEW B 97(4), p. 045137-1 - 045137-5, doi: 10.1103/PhysRevB.97.045137
(WOOLLAM-MIR, WOOLLAM-VIS, RIGAKU9, FTIR, CRYOGENIC)
Holobrádek, J., 2017: Transport Properties of One Magnetic Nanostructures. BACHELOR´S THESIS , p. 1 - 48
(TITAN, ICON-SPM, MIRA, EVAPORATOR, WIRE-BONDER, CRYOGENIC)
Jaskowiec, J., 2017: Magnetic Force Microscopy and Transport Properties of Metamagnetic Nanostructures. BACHELOR´S THESIS , p. 1 - 47
(MAGNETRON, MIRA, RAITH, ICON-SPM, CRYOGENIC, LYRA)
Kukolova, A., 2017: Experimental study of electronic properties of manganites and electron stimulated desorption. MASTER´S THESIS , p. 1 - 91
(WOOLLAM-MIR, WOOLLAM-VIS, CRYOGENIC)
Instrument is comprised of the following components:
- A cryostat incorporating a cryocooler, superconducting magnet and a variable temperature sample space.
- Rack incorporating electronics for control and monitoring of the cryostat and any measurement options.
- Measurement system software.
- Sample probes (two types - VSM, Resistivity).
Cryocooler system and cryostat
Cooling materials to cryogenic temperatures has traditionally used liquid cryogens (usually helium and nitrogen). The same results may be achieved more simply by mechanical means, using a cryocooler. Cryocoolers operate using a helium compressor, which requires just mains power and a source of cooling water. The cryocooler high pressure helium circuit is completely independent to the rest of the measurement system. However, it provides the cooling to both the magnet and the variable temperature insert (VTI). The cryostat is a vacuum insulated chamber whose primary function is to support and thermally shield the superconducting magnet and VTI.
The magnet in our system is a vertically oriented solenoid wound from copper stabilised filamentary niobium titanium (NbTi) superconducting wire. The coil is cooled by the cryocooler to an operating temperature of 3–4 K.
|Magnet type||NbTi solenoid with persistent mode switch|
|Central field homogeneity||0.1% over 10mm diameter x 10mm long cylinder|
|Decay rate in persistent mode (ppm/hr)||10|
|Magnet inductance (Henries)||5.3 H|
|Maximum Operating Field (Tesla)||9 T|
|Nominal operating current (amps)||108.3 A|
|Radial stray field 5 gauss contour (m)||1.3 (from centre of magnet)|
|Vertical stray field 5 gauss contour (m)||1.6 (from centre of magnet)|
|Initial magnet energisation rate||0.3 T/min|
|Maximum subsequent energisation rate||1.0 T/min|
|Magnet power supply||Cryogenic SMS120C (120A, +/-5V)|
|Low field option +/=300mA (24 mT)|
Cryocooler (Water cooled Compressor)
|Type||Sumitomo 1 W Pulse Tube Cryocooler|
|Compressor mains requirements||410 V, 3 phase, 16A or 32A|
|Compressor cooling water minimum flow rate (l/min)||7|
|Static compressor gas pressure (bar)||17.0|
|Working compressor gas pressure (bar)||21|
|Typical cooldown time (hrs)||11|
|Temperature range (K)||1.6–400|
|Temperature stability (K)||+/- 0.05|
|Internal diameter (mm)||25|
|Normal operating pressure (mbar)||5–15|
|Dump vessel pressure with system at room temperature||Atmosphere plus 0.25 bar (approx)|
|Dump vessel pressure with VTI at base temperature||Atmosphere minus 0.5 bar (approx)|
|Variable temperature insert without VSM coils inserted||Circulating helium gas 25 mm inner diameter|
|With VSM coils inserted||Static exchange gas 14 mm inner diameter|
Here is place for your documents.