S700X SQUID Magnetometer
The S700X SQUID Magnetometer is the most sensitive instrument for DC and AC measurement of magnetic properties as a function of magnetic field and temperature. Numerous different experiments may be performed with this unique instrument. The SQUID sensor at the heart of the system has an input noise power sensitivity of approximately 10-30 Joules per root Hz. This energy sensitivity is 108 better than any semiconductor device and accounts for the instrument's ability to resolve extremely small magnetic signals with accuracy and speed. The S700X has several modes of operation. The most widely used is the measurement of total magnetic moment made by moving the sample through a set of pick-up coils. During the measurement the sample temperature and applied magnetic field are precisely controlled. The second order gradiometer configuration used for the pick-up coils is insensitive to the externally applied field but allows samples of 10-11 Am2 total moment to be resolved with ease.
Cryogen Free Cryostat with integrated VTI and high homogeneity magnet CF-S700X;
No liquid helium or nitrogen
The magnet and the sample space are cooled directly by a 1 Watt Pulse Tube cryocooler and operates in vacuum.
Requires a 7.0 kW compressor which is water cooled
Liquid Helium Cryostat with integrated VTI and high homogeneity magnet S700X;
45 litres reservoir for liquid helium and liquid nitrogen reservoir
2 to 4 litres per day of helium consumption.
5 litres per day liquid Nitrogen.
Re-condensing cryostat with integrated VTI and high homogeneity magnet R-S700X.
Allows samples to sit in Liquid Helium
45 litres reservoir with Pulse Tube cooler for Zero boil-off system.
No liquid Nitrogen.
Requires a 7.0 kW compressor which is water cooled
Key Features
The following competitive features are provided in all of the basic systems packages.
Continuous Measurements
To make continuous measurements in a changing background field, we include the Oscillating Mode facility. Under this condition the sample is oscillated vertically over a distance of few millimeters. The detected sinusoidal signal from the SQUID is proportional to the magnetic moment of the sample.
Fast Temperature Changes
The ultra light design of the sample chamber allows fast temperature changes and stabilizes quickly, because there is hardly any heat capacity to overcome other than that from the sample holder and the sample. A second temperature control loop regulates the temperature of sample space tube in order to enhance the performance at higher temperatures.
Any temperature within the wide range of 1.6K to 370K can be kept continuously, as long as there is liquid helium in the main reservoir.
Magnetic Shielding
Based on the experience in the field of Rock Magnetometers, the S600’s shield system consists of a mumetal can and a niobium shield, which reduces the background field to as little as 0.5 mG. The system is fully shielded against external noise and changes in the background field.
Data Acquisition
The 16 bit DAQ with software controlled preamplifiers can cope with signals of 130dB dynamic range. An optional range changer widens this span to 190dB.
User Friendly
Great care has been taken to make the system as user friendly as possible. The new LabVIEW software provides an open software environment that allows the user direct control of all features of the system with real-time graphical displays of all the relevant functions.
The data gained during a measurement are analyzed in terms of magnetic multipoles. This unique feature gives a dipole moment independent of the sample shape and is error tolerant in respect to sample position. A feature which allows inexperienced users to perform reliable measurements.
An on-line help feature, which is available at any stage of the experiment, provides support to newcomers making their first measurements and allows advanced users to optimize the system performance according to their requirements.
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