The HEMS systems have an integrated hardware and software system designed to measure and analyze the electronic properties of samples.
The system design offers the possibility to take measurements under the magnetic field up to 2.5 Tesla.
At the same time, the system offers the opportunity to take measurements in the range of 3K-1273K with 2 different temperature measuring heads, while it provides an easy assembly of samples related to the probe system that can move in 3 different axes.
NMI – Hall Effect Measurement System (HEMS) device Performs electrical characterization of semiconductor, organic conductor and metal oxide materials. These materials developed with nanotechnology methods are used in the development of chip technology, the development of solar cells, the development of material science, space technology, defense industry.
QUESTION: What is the difference between HEMS and ezHEMS devices?
ANSWER: There is no difference in the working principle in our HEMS and ezHEMS devices. The HEMS device covers the low, medium and high resistance range, while the ezHEMS device is considered the medium resistance measuring device. While using the electromagnet system in the HEMS device, the permanent magnet system is used in the ezHEMS device and there are only two different magnetic field options. In addition, the HEMS device is very large, the ezHEMS device is more portable and desktop size.
QUESTION: What is the Hall Effect Measurement System (HEMS)?
ANSWER: Hall measurement systems are measuring devices that perform electrical characterization of the samples based on “Hall Effect Theory”.
QUESTION: What types of samples can we use for HEMS device?
ANSWER: GaAs, based materials (HEMSTs, pHEMTs, HBTs, FETs, MESFETs, InP, InAs, GaN, AIN, Si, Ge, SiC, HgCdTd, ZnO, SiGe, MnGaAS, infrared applications (LED, laser diodes, detectors), metal oxides, organic, inorganic conductors, ferrits etc.
QUESTION: What is the sample size for HEMS?
ANSWER: 5mm x 5mm sample size (large sizes are optional)
QUESTION: What is the measurement type for HEMS?
ANSWER: Measurement types are resistivity, magnetoresistance, R-T, van der Pauw, Hall Bar,
QUESTION: What is the measurement temperature options for HEMS?
ANSWER: There are 2 different temperature measurement options and measuring heads for HEMS;
3K-300K: low-temperature measurement option
300K-1273K: high-temperature measurement option
QUESTION: We can use the HT and LT heads at the same time?
ANSWER: HT meaning is “High-Temperature measuring head”, and LT meaning is “Low-Temperature measuring head”. Measurement heads are different for HT and LT. If you want to measure between 3K-300K, you need to use LT-head. If you want to measure between 300K-1273K, you need to use HT-head.
QUESTION: How does the LT measuring head cool?
ANSWER: The cooling head is special for the HEMS and the cooling process is cooled with the “cryogen-free” system with the help of He compressor.
QUESTION: When should we use the vacuum pump?
ANSWER: You must use the vacuum pump for all temperature measurements.