Magnetic field sources - Import export

Induction magnetometer allows to measure magnetic field isotherms of magnetization (magnetization versus magnetic field (M(H) dependences) in the fields up to 2 T and in the temperature interval from 80 to 370 K. Magnetization is measured by induction method. Specification: - temperature interval — from 80 to 370 К, - magnetic field interval — from 0,02 to 2 Т, - relative measurement accuracy of magnetization - 2 %, - maximal sample dimensions - Ø1.5 × 3.7 mm. Magnetometer (its measuring part) consists of the measuring insert, electronic module and control and data acquisition program and can be used together with the magnetocaloric measuring setup (which includes permanent magnet adjustable magnetic field source, liquid nitrogen cryostat, temperature controller, 2 digital voltmeters, control computer with corresponding interface and control boards).

For testing cardio-stimulators and other medical devices, a set of the magnetic field sources was designed having a magnetic flux density in the working area from 1 to 300 mT.

The magnetic system of this field source is also built on the principle of nested cylindrical Halbach-structures. An important feature is the presence of two motors, controlled independently, so it is possible to manage the change not only the magnitude but also the direction of the magnetic field. Because the device was designed for operation together with an optical microscope, the vertical size of the system near the working region is reduced to 90 mm. Stepper motors, that turn the two magnetic subsystems, are located on the sides of the casing

High-tech research is, perhaps, that particular market where the scientific potential and expertise of AMT&C’s research and engineering personnel can most fully be realized and appreciated. We offer the calculation, design and manufacture services in creating high-strength high-uniformity rare earth magnetic field sources/systems for BEAM CONTROL applications (beam focusing, charged particles acceleration and deflection). The development of permanent magnetic field sources for use with SPM, STM, AFM systems, as well as for MRAM and MRI/NMR applications, to the customer’s specific requirements is another promising area for advantageous collaboration.

This type of magnetic field sources also is based on the principle of dipole Halbach-structure, but the special design permits to get an optical access to the sample under investigation along several directions with a rather wide aperture. It is possible to supply the system with a built-in field measuring system, connected to a PC. The field adjustment can be controlled from a PC or with a built-in controller. The geometrical and field parameters described above can be change under customer specification.

AMT&C LLC offers the wide variety of measuring inserts under customized requirements. Measuring inserts are designed for operation with Halbach-type adjustable magnetic field source, for following applications: - ac susceptibility; - dc susceptibility and magnetization measurements; - torque magnetometry; - heat capacity measurements; - electro-transport measurements; - thermal transport measurements.

Experimental setup for express measurements of the adiabatic temperature change in the room temperature range. The setup is intended for measurements of the magnetocaloric effect (MCE), namely adiabatic temperature change (ΔТ), in the temperature range from 273 to 370 K in order to get ΔТ versus temperature dependences rapidly and evaluate suitability of using of the material under investigation as a working body of magnetic refrigerators. The measurements in the setup are conducted by the direct method with the help of a thermocouple. The magnetic field change is accomplished by linear movement of the permanent magnet magnetic field source along the measuring insert. The setup operates in automatic mode under control of the program written on LabView. The setup includes: - the desktop measuring unit, - the desktop control unit, - the ΔТ measuring system, - the control computer. The enhanced algorithm of the setup operation makes possible to investigate up to 20 samples per day.

LLC "AMT&C" offers automatic measuring system (AMS) for measurements of the magnetocaloric effect and other magnetic parameters. AMS includes: - Halbach-type magnetic field source with changing magnetic field based on permanent NdFeB magnets, - liquid nitrogen cryostat, - the set of measuring inserts, - data acquisition and measurements control system guided by a control computer. AMS has the following working parameters: - variable magnetic field strength - from -1.85 to +1.85 T, - variable frequency of the magnetic field change from 0.1 to 1.8 Hz (magnetic field change rate from 0.05 to 6 T/s), - dimensions of the magnetic field area with heterogeneity no more than 1 % - diameter 20 mm, length 20 mm, - working temperature region – 80 ÷ 365 К, - automatic and manual measuring modes. The basic option of AMS is the magnetocaloric effect measurement. - sample dimensions (min-max) (1-2)×(2-5)×(8-10) mm, - measurement accuracy of magnetocaloric effect: 0.1 K.

AMT&C LLC for many years is engaged in design and manufacture of the measuring equipment intended for research of magnetic properties of materials. In the field of the magnetocaloric effect (MCE) these products continue own scientific interests of the AMT&C company employees, recognized experts in this realm of physics. Manufacture of the scientific equipment is based on the following core technologies, backed by patents and numerous know-how: - a wide experience in design and manufacture of complicated magnetic systems, including the adjustable magnetic field generators, controlled by a computer; - use of the most advanced products and ideas in the field of measuring technics; - the magnetic field source and data acquisition system are controlled by means of the specialized software that allows to create setups operating in automatic mode; as a rule, the LabView based software is used. Since 2009 AMT&C LLC produces the measuring equipment under trade mark "MagEq".

Our coil systems are specially designed to generate very large magnetic fields in 1 to 3 dimensions. Every system essentially consists of 2 units: The coil system and the current control system to set the coil currents. The systems can be used for calibration, to compensate external fields, to generate specific magnetic fields, magnetic gradients etc. Our specification scope ranges from: - Frequency ranges: DC to 4 MHz, - Field ranges: from a few microtesla to 200 millitesla - Homogenity ranges: 1%, also over large volumes with small coil sizes - Field stabilities up to a few ppm FS - Size range from a few cm to more than 200 m - Actively compensated for environmental changes or uncompensated (optional) - Generating both magnetic fields and magnetic gradients with or without compensation - Magnetic far field drop off: r-3 to r-11

AMT&C LLC offers a full range of services in calculations, design and manufacturing of permanent magnet assemblies with required magnetic field configuration. Many years experience in complicated magnetic systems production combined with application of modern most effective magnetic materials permit us to reach high parameters: - to produce, with permanent magnet systems, the magnetic flux density up to 3 Tesla and more; - to reach high homogeneity up to 105; - to create magnetic systems with complicated field pattern; - to produce adjustable magnetic field generators on the basis of permanent magnets. The magnetic field changing rate in such systems can reach 10 Tesla per second.

STL offers the earth magnetic field simulator (EMFS) which can be used for worldwide simulation of the earth magnetic field. Earth Magnetic Field Simulators (EMFS) are typically being installed in a bay area or river estuary as well as artificial harbours. The EMFS System is used for calibration of the onboard degaussing system (OBDS) and Navy vessel's preparation for any operation missions and the dedicated simulation of the magnetic field in the area of mission. Quantity and type of used sensors, sensor array, software and coil system including power sources are always designed in respect of the specific requirements of the customer. STL can supply: - Complete sensor array - Data acquisition system - Control and evaluation software - coil cables and power sources Pricing may vary depending on the requested cable length, available power supply and required magnetic field.