Products: Kerr Microscope - High Pressure Milling Vial
magneto-optical kerr-microscope
high pressure milling vial
Evico GmbH


magneto-optical kerr-microscope

Features (excerpts):

High-end wide-field Polarization Microscope

  • Zeiss optics

  • Microscope mounted on granitic plate for mechanical stabilization

  • Objective lenses with magnifications from 5x to 100x (oil immersion). Optical zoom lenses 1x, 2.5x, and 4x for increasing the magnification of the microscope image (not the resolution!)

  • Adjustable inclined or perpendicular incidence

  • Computer controlled choice of Kerr sensitivity. Depending on the configuration, the following Kerr sensitivities can be chosen:
    (i) longitudinal sensitivity with superimposed polar sensitivity,
    (ii) transverse sensitivity with superimposed polar sensitivity,
    (iii) pure polar sensitivity,
    (iv) simultaneous display of longitudinal and transverse contrast (with polar contrast superimposed),
    (v) simultaneous display of pure longitudinal and pure transverse contrast,
    (vi) simultaneous display of pure longitudinal (or pure transverse) contrast and pure polar contrast


  • Sample stage for sample sizes up to 35 mm, manual x-y sample shift up to ± 14 mm, manual sample rotation by 360°

  • Polarizer, rotatable

  • Rotatable analyzer and compensator module

  • Lens system for corrected illumination

  • Computer-controlled compensation of parasitic Faraday effect in the objective lens

Light Source

Specially developed Kerr-LED lamp, based on eight light-emitting diodes the light of which is guided to the microscope by glass fibers. The ends of the fibers are arranged in a specific array-way and are imaged to the diffraction plane of the microscope.

Various Kerr-sensitivity options (longitudinal, transverse, and polar Kerr sensitivities) can be chosen by activating different LEDs of the array. The selection is made conveniently by computer control.

The Kerr-LED lamp can be obtained in a monochromatic (white light) or dichromatic (blue and red light) version. In this latter high-end version, images of different color and Kerr sensitivity are generated at the same time and separated by a color-sensitive image splitting device between microscope and camera. Both images are then displayed simultaneously within the same frame on the screen.


Sensitive low noise digital (cooled) CCD camera

  • Frame rate 8.8 - 115 frames/s (resolution dependent)

  • Resolution maximum: 1.37 million pixels (1344 x 1024)

Rotatable Electromagnet ("Standard" Magnet)


  • Manually rotatable by 360°

  • Supported on a magnet holder with adjustable height, support independent from sample holder

  • Water-cooled

  • In-plane field range from 10-4 T up to 1.40 T

Measurement Computer and Software

  • Configurated workstation

  • NI LabView based measurement software "KerrLab"

  • Camera control

  • Magnetic field control (DC, AC, demagnetization etc)

  • Image processing capabilities for high contrast magnetic domain observation (real-time difference imaging technique)

  • Recording of surface hysteresis loops (MOKE magnetometry) with simultaneous domain movement observation