High resolution magneto-optical cryostat: MicrostatMO2 system

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The MicrostatMO2 is a compact stable optical cryostat, which provides a cryogenic environment (6 K) ideal for sensitive optical and electrical measurements in magnetic field (up to 5 T).

New look, new features, new accessories, new software.

All these advantages in a single cryostat...

Wide sample temperature range from 6 K to 300 K
Magnetic field up to 5 T, satisfying the majority of spectroscopy applications
Low vibration and drift: typically 4 nm/min
Low sample vitration: <20 nm typical
Short working distance of 8.5mm enabling the use of high magnification optics
Can be orientated horizontally or vertically, providing flexibility for setting-up the experiment
Designed for easy integration of optical components on the cryostat top plate
Can be used for reflection and transmission measurements
Minimum downtime: conventient continuous optieration including improved 300 K operation
Quick sample change using a demountable sample holder. Two options are available: a copper sample platform for lower base temperature or a sapphire platform for optical transmission measurements
System can be cooled using a pressurised liquid helium dewar for convenient operation with minimum vibration
Mounting bracket supplied to clamp the cryostat to the bench, thus reducing vibrations introduced by the transfer tube

Supplied with the new range of electronics MercuryiTC temperature controller and MercuryiPS power supply.

Specifications
System options
Integration
Applications
New accessories

Maximum magnetic field at sample position	5 T
Magnetic field stability in persistent mode (switch included)	0.01 %/hr
Magnetic field homogeneity	2% over 5 mm diameter spherical volume
Maximum magnetic field sweep rate	1.0 T/min
Temperature range on the sample heat exchanger	6 K to 300 K measured with pressurised LHe storage dewar (see note 1) 5 K achieved with RV12 pump (option)
Temperature range on a demountable copper sample holder (standard)	7 K to 300 K measured with pressurised LHe storage dewar (see note 1) 6 K achieved with RV12 pump (option)
Temperature range on a demountable sapphire sample holder (option)	8 K to 300 K measured with pressurised LHe storage dewar (see note 1) 7 K achieved with RV12 pump (option)
Temperature stability	± 0.1 K measured over 10 minutes
Typical cool-down time from room temperature to 6 K	4 hours
Typical average liquid helium consumption at 6 K	2 litres per hour
Typical liquid helium consumption per day	25 litres, based on 10 hours of operation and including two complete sample changes

1. Pressurisation of the liquid helium Dewar is the responsibility of the customer and a check should be made to establish that this is permitted within their laboratory safety regulations

The complete MicrostatMO2 system consists of:

MicrostatMO2 high resolution magneto-optical cryostat
Sample holder
LLT600 low-loss liquid helium transfer tube
MERCURYiTC Intelligent cryogenic environment controller
MERCURYiPS magnet power supply
Gas flow pump (optional)

The MicrostatMO2 uses the standard accessories of the Oxford Instruments' spectroscopy and optical cryostats product range

Window options

As standard the MicrostatMO2 is supplied with a 0.5 mm thick Spectrosil WF top window assembly with 15 mm aperture
A wide range of other window materials are available on reques

Sample holder options

Standard copper sample platform for lowest base temperature
Optional sapphire window sample platform for optical transmission measurement

Gas flow pump and controller

The MicrostatMO2 can be most conveniently cooled using a pressurised liquid helium dewar ("push mode")
For the lowest base temperature select the optional pump ("pull mode")

Optical bench mounting

The MicrostatMO2 is equipped as standard with a mounting bracket to attach it directly to a non-magnetic optical bench
Optional stand-off pillars are available for mounting the MicrostatMO2 above a standard (magnetic) optical bench, to ensure safe and reliable operation with the magnetic field on

MicrostatMO2 integration into a bench configured optical microscope system

Integration into a bench configured optical microscope
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Although optical microscope system configurations vary considerably depending on the specific experimental application, Oxford Instruments can provide some guidance on the choice of components for the interface optics for the MicrostatMO2. This is particularly an issue where components are to be placed in close proximity to the magnetic field generated by the MicrostatMO2, in which case components with zero or negligible interaction in the magnetic field are required to achieve safe and reliable operation. Whilst Oxford Instruments NanoScience cannot accept any responsibility or liability for the performance of the overall optical system, the following selection of components have been identified as suitable:

Recommended optical components for MicrostatMO2	Manufacturer	Part Number
XYZ non-magnetic piezo stage for objective lens positioning	Physik Instrumente (PI)	P-611K021 non-magnetic nanocube
Controller for piezo stage	Physik Instrumente (PI)	E-664 analogue controller or E-500 series modular controller
Mulitfunction IO & A-D card for computer control of piezo stage	National Instruments	USB 6229
CCD Firewire TV camera for imaging sample	Thorlabs	DC210C
100 x microscope objective lens for collecting luminescence	Mitutoyo	NT56-983
Polarizing beam-splitter for microscope 600 - 1000 nm	Newport	10FC16PB.5
Non-magnetic xyz stage for piezo stage mount	Standa	7T34-20

Information and image provided courtesy of Dr Robert Taylor, Clarendon Laboratory, Oxford University, UK

Microscopic optical measurements, such as Photoluminescence and Raman scattering under varying magnetic field. Study of microstructures such as quantum dots / wires / wells and nanostructured semiconductor devices.
Flux visualisation of superconducting materials. 5T magnetic field extends the range of samples that may be studied to include materials with strong flux pinning.
Electrical transport measurements using very small currents for nanoscale samples, quantum devices and nano-devices.
Measurement of dimensional changes of magneto-restrictive materials.

NEW Transfer tube - It plays an important part in the overall helium consumption and base temperature capability of helium cooled cryostat.

Oxford Instruments Low Loss Transfer tubes (LLT) use the cold gas exiting the cryostat to cool the shields surrounding the incoming liquid within the trasfer tube. As a result, the consumption of our cryostats is the lowest on the market, dramatically reducing your running costs.

We can also offer an extra flexible transfer tube for those with restricted space in their labs. Please note that as this does not use the gas cooled mechanism, helium consumption will be higher that for the LLT range. However it will be well suited to those who need lightweight and more flexible transfer tube.

NEW Gas flow controller - The new VC-U gas flow controller now includes the nitrogen and helium flow meters as standard.

NEW Intelligent cryogenic environment controller - Easy monitoring and control of the sample stage. The MercuryiTC controller combines several instruments into one allowing temperature control at the heat exchanger and glas flow control as well as an extra sensor channel for thermometry measurement directly at the sample stage. Everything can be accessed through touch screen front panel and remotely via Labview compatible Oxsoft IDK software.

Example MicrostatHe2: You can control the temperature with a sensor and heater at the heat exchanger, monitor and control the gas flow, AND have an extra sensor channel to measure sample temperature.

NEW Magnet power supply - Best in class stability performance and optimised for accuracy and low noise.

New Oxsoft IDK instrument development kit software - With the new Oxsoft IDK, you have new levels of control. You can design remote control and configuration programs and integrate your system into your preferred experiment control architecture.

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