ADVANCED MAGNETIC TECHNOLOGIES AND CONSULTING (AMT&C) - Designer and manufacturer magnetic systems for domestic, industrial and scientific applications

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.

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".

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.

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.

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).

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.

The thermal conductivity measuring insert is intended for measurement of the thermal conductivity coefficient temperature dependencies in constant magnetic field using stationary method. The inner sample holder is equipped with the resistive heaters, resistive temperature sensors and Hall sensor. The thermal conductivity measuring insert characteristics: - relative measurement accuracy of thermal conductivity coefficient: 3 %; - sample dimensions: a rectangular plate 22×4×2 mm; - temperature interval – from 80 to 370 K; - magnetic field interval – from 0.02 to 2 T.

The heat capacity measuring insert is intended for measurement of the heat capacity temperature dependencies in constant magnetic field. In this insert the adiabatic method is used. The inner sample holder is equipped with the resistive heaters, resistive temperature sensors and Hall sensor. The heat capacity measurement insert characteristics: - relative measurement accuracy of heat capacity: 3 %; - sample dimensions: a rectangular bar 4×5×2.5 mm; - temperature interval – from 80 to 370 K; - magnetic field interval – from 0.02 to 2 T.

AMT&C LLC offers a manufacturing of various types of electromagnetic systems. Additionally to the electromagnet itself, we can supply power units, switching units, cooling system and software for the system operation under PC control.

AMT&C LLC offers a compact design of high power electromagnets with water cooling. It is possible to obtain the magnetic inductance up to 2 T, adjustable inter-polar gap, supplying in a set together with a computer-controlled power unit (including polarity reversal) optical channel along the field direction, and other options. We work according to the customer's specifications. The electromagnets presented, as an example, in the photo has the basic characteristics: - adjustable gap from 30 to 65 mm, - the maximum field in the gap of 35 mm-0.8 T, - the maximum field in the gap of 65 mm-0.5 T, - weight-95 kg - maximum power consumption-4.5 kW