The Mesa is the only hysteresis loop tracer on the market that can make measurements in the frequency range of 10 Hz and below. Competing units operate with more-easily generated 60 Hz drive fields, and can have errors of as much as 30% in coercivity (Hc) measurements.
This latest generation instrument is fully computer controlled and capable of displaying and measuring BH loops, magnetoresistance (MR/GMR), and magnetostriction.
All instruments are equipped with a “pattern memory” feature, to digitally cancel ambient magnetic fields and allow for operation at extremely high sensitivities, even in relatively noisy magnetic environments. Digital Signal Processing allows any remaining noise to be dramatically reduced by digital filtering algorithms.
magnetic measurement systems can also be used for measurement of bulk magnetic material.
The Mesa is the only instrument of its type designed to make measurements in the frequency range of 10 Hz and below, avoiding the substantial errors inherent in higher frequency operation.
The Mesa is controlled by a PC running Microsoft Windows, and uses internal DSP processors for high-speed waveform generation, digitization and processing. All instruments are equipped with a “pattern memory” feature to digitally cancel ambient magnetic fields and allow for operation at extremely high sensitivities, even in relatively noisy magnetic environments. Digital Signal Processing allows any remaining noise to be dramatically reduced by sophisticated digital filtering algorithms.
Options include pickup assembly size, drive coil diameter (maximum sample size), SECS/GEM support and Autoloading.
Real-time measurements
AutoTest recipe creation and management software
No need to cut wafers
High sensitivity
Excellent repeatability
Advanced DSP signal processing
Optional autoloader
Accommodates wide range of sample sizes and thicknesses
Magnetoresistance (MR/GMR)
Magnetostriction
Measurements
Br
Bs
R
ΔR
Hc
He
Hk
Magnetostriction
Dispersion
Skew
Low-frequency sinewave sweeps (5 to 10 Hz)
0.01 to 1000 Oe/division horizontal sensitivity range
0.01 to 10,000 nW/division vertical sensitivity range
Digital background subtraction to cancel ambient fields
Earth’s field cancellation
Two-axis drive coils
Cursor for detailed waveform measurements
shbWin control software provides flexible and friendly instrument operation
Supports Microsoft Active-X object model for optional user program control of all instrument functions and measurements
Digitize multiple hysteresis loops; display on PC and save to disk
Remote instrument operation and troubleshooting via modem or network
SECS/GEM support available
MACRO PROGRAMMING CAPABILITY
The optional macro programming software module allows the creation of complex measurements (Figure 4). Building blocks provided in this module include looping structures, the definition of sub-macros and programmatic access to all hardware components of the tool.
DATA ANALYSIS
The DiskMapper H8 software includes a powerful data analysis module (Figure 5). This built-in analysis capability enables visualization of saved data. In addition, many data manipulation functions are provided to allow post-processing of measurement data. Manipulated results can be exported or saved in the same way as raw data.
SUMMARY
By quickly and accurately measuring the magnetic parameters crucial to HAMR/TAR PMR media production, the DiskMapper H8 system improves the ability to keep the deposition process under control. The full disk, non-contact measurement technique and automated handling make the DiskMapper H8 system essential for production use and yield improvement.
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