ezHEMS | Hall Effect Measurement System

The ezHEMS systems have an integrated hardware and software system designed to measure and analyze the electronic properties of samples.

Compact Hall Effect Measurement System

 

The ezHEMS systems have an integrated hardware and software system designed to measure and analyze the electronic properties of samples.

The ezHEMS device, a more portable version of HEMS (Hall Effect Measurement System) devices used worldwide.

Due to the system design, there are two different magnetic field options with permanent magnets.

Permanent-magnet based configurations provide fields to 0.6T or fields to 1T available in the standard system.

The system include “Low temperature measuring head-LT”, “High Temperature Measuring Head-HT” and “Room Temperature Head-RT” between 20K and 800K temperatures.

The design of the low temperature measuring head enables the cooling process to be taken at a lower cost by using liquid nitrogen (LN2 / no cryogen-free).

At the same time the system include the specimen area that is easily positioned into the system with the 3-dimensional moving probe system inside the measurement head.

The controller of the system is designed for easy and precise operation in the current range of +/- 2nA to +/- 20mA.

Through to the design, all connections can be made between the system parts with two cables with connector terminals, and only one USB cable is required between the system and the computer.

The LabView-based software of the ezHEMS device enables smooth operation on the Windows ® operating system.

 

Features/Options

 

Carrier Concentration : 10⁷ – 10 ²¹ 1/cm ³

Mobility : 1 – 10⁷ cm² /Vs

Current: ±2nA à ±20mA

Resistivity: 10⁻⁴ – 10⁹ Ω.cm

Temperature Range : 4K – 800K

Magnetic field options : 0,6 T / 1,0 T / ±1,0 T (adjustable)

 

Technical Specification

 

  • Resistivity Measurement Range:10⁴to 10⁹Q-cm(sample dependent)

  • Mobility:1 to 10⁷cm²/Volt-sec(sample dependent)

  • Concentration:10⁷to 10² per cm³(sample dependent)

  • Current Source:±2nA to ±20 mA,±12V compliance

  • Minimum Hllvoltage measurable:0.10 μV

  • Supports van der Pauw as well as Hall bar shaped samples

  • Magnetic Field:0.6 Tesla or 1 Tesla permanent magnet

  • 80-800K(±5%)temperature range with ±0.2K resolution for Low Temperature,±1K resolution for High Temperature.Entire temperature range in a single system.

  • Lower and hgher temperature ranges are optonal

  • Computer control through USB interface

  • Samples sizes from 5mmx 5mm to 15mm x15 mm&with thickness<2mm

  • Automated movement of magnets controlled by ezHEMS Control Software

 

The ezHEMS Measurement System Software Capabilities

 

  • Enables data logging and plotting of different measured quantities;-V curve,resistance, resistivity,sheet resistance,magnetoresistance,carrier conc.,Hall mobility,Hall coefficient etc.asa function of sample temperature

  • Provides the measured data in tabular form

  • LabVIEWTM drivers

 

 

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