741-VTA temperature option kit
The autotuning cryogenic temperature controller is used to measure and control our full suite of variable temperature options. The 741-VTA includes a Lake Shore temperature controller, thermocouple input card (when purchased for use with the high temperature oven or single stage variable temperature assembly), vacuum handling kit, mounting hardware (included with the 74035 SSVT option), flanges, hoses, connectors, and accessories. Note: only one 741-VTA is required for all variable temperature options.
74046 magnetoresistance (MR) probe
The MR probe option performs fast and accurate measurements of MR, GMR spin-valve, CMR and other magnetoresistive materials as a function of both in-plane magnetic field and temperature. This measurement option includes data acquisition, control, and analysis software to automatically extract pertinent parameters for the device under test. These include free and pinned layer parameters of both simple and synthetic spin-valve sensors.
The MR probe features four in-line pins for solder-less connection to the sample and is interchangeable with the VSM sample rod for compatibility with variable temperature and autorotation options. The temperature range of use extends from 20 K to 450 K when used with the 74018 LHe/LN2 cryostat, 325 K to 673 K with the 74034 oven, and 100 K to 673 K with the 74035 single-stage variable temperature assembly. Angular dependent MR measurements are possible when used in combination with the 74033 autorotation option. Contact pins maintain their position on the sample while the entire assembly rotates with respect to the magnetic field.
The fully automated MR software is an intuitive yet powerful user interface providing automatic control of all experimental parameters for unattended operation. Experiment recipes can be saved, retrieved, and edited, and measurement data can be displayed and exported in graphical or tabular format. Multiple step profiles can also be defined to allow for flexibility in the preparation steps and for developing annealing step process methodologies.
The MR probe option is composed of several user-replaceable parts, including contact pins, ceramic pin guides, a ceramic sample holder, a contact pressure spring, and a printed circuit board, providing the convenience of in-field maintenance.
Included with the 74046:
- MR hardware insert
- Lake Shore Model 776 matrix switch
- Model 2400 Keithley sourcemeter
- 4-wire I-V cable and MR adapter box
- MR spare kit (2 PCBs, 1 contact pressure spring, 8 points, 1 pin guide, 1 lower holder—user-replaceable)
The rotation option allows you to automatically vary the sample orientation relative to the direction of the applied magnetic field. The angle of rotation is within a single plane defined by the direction of applied magnetic field, referred to as the x-axis. Angular variation is about the z-axis. Rotation is programmable to a resolution of <1° for rotating the sample from -10 to 730° and all parameters are measured as a function of rotation angle.
74032XY vector coils
The vector option extends the VSM measurement capabilities to facilitate investigations of anisotropic magnetic materials, allowing you to determine their vector magnetization components and susceptibility tensor. When used in combination with the 74033 autorotation option, the vector coils provide information that is essentially identical to that provided by a dedicated torque magnetometer. The 74032XY 2-inch vector coils are compatible with all variable temperature options.
E2M 2-stage rotary vacuum pump
Capable of achieving a pressure below 0.67 Pa (5 × 10-3 Torr) at 1 m3/h, the 2-stage rotary vacuum pump is used for evacuating both the oven and cryostat vacuum spaces of our variable temperature options. This, or a similar vacuum pump, is required for daily operation of variable temperature options.
TPS-FRG turbomolecular vacuum pump station
Used to annually evacuate the cryogen transfer line of the optional cryostat and single stage variable temperature assembly (transfer line and kit are included with these options), the TPS-FRG provides vacuum to 1.33 × 10-3 Pa (10-6 Torr). In addition to annual cryogen transfer line maintenance, the turbomolecular vacuum pump can also be used in place of the E2M rotary vacuum pump for evacuating the cryostat vacuum space.
Lake Shore offers NesLab® recirculating chillers in order to provide a complete laboratory solution. The NesLab chillers feature a CFC-free refrigeration system.
The refrigeration system uses a hermetically sealed compressor and hot gas bypass system of temperature control. This system eliminates on/off cycling and premature wear of the compressor. Strong pumps provide continuous flow even through cooling lines with small IDs.