SQUID Laboratory

Manufacturer details:Quantam Design, USA

Purchase source (funding):Institute

Year of installation: 2010 

The Quantum Design MPMS SQUID VSM EverCool system features an integrated pulse-tube cryocooler-dewar system that not only recondenses the liquid helium directly within the EverCool Dewar but also liquefies the initial charge of liquid helium directly from helium gas. This eliminates the need to use any liquid cryogens for the operation of the MPMS SQUID VSM.

The l SQUID VSM utilizes a 7 Tesla, superconducting, helium-cooled magnet and accomplishes rapid switching between charging and discharging states and stable fields with a unique superconducting switching element called the QuickSwitch, which changes, between superconducting and normal states in less than one second. This allows rapid collection of high precision data. Typical M-H loop up to 5T would take ~ 60 mins and M-T measurement would take ~70 mins.

Other Features:

Operating Range: 1.8 K to 1000 K 

Cooling Rate: 30 K/min (300 K to 10 K stable in 15 min.); 10 K/min (10 K to 1.8 K stable in 5 min.) 

Temperature Stability: +/- 0.5% 

Temperature Accuracy: lesser of +/- 1% or 0.5 K 

Magnetic field control 

Feature: QuickSwitch 

   Magnetic Field Range: -70 kOe to +70 kOe 

   Field Uniformity: 0.01% over 4 cm 

   Field Charging Rate: 4 Oe/sec to 700 Oe/sec 

   Field Charging Resolution: 0.33 Oe 

   Remanent Field: ~5 Oe (typical) when oscillating from full field back to zero

Magnetization measurements 

Feature: SQUID based VSM FastLab

Maximum DC moment: 10 emu 

Sensitivity: < 2,500 Oe < 1 x 10-8 emu (with less than 10 second averaging) > 2,500 Oe < 8 x 10-8 emu (with less than 10 second averaging) 

Variable drive amplitude: 0.1 to 5 mm (peak-to-peak)