The macroscopic properties of a magnetic material (hysteresis, energy loss, magnetic noise, etc) are determined by its magnetic microstructure, i.e. by magnetic domains and their reaction to magnetic field excitation. Therefore domain observation is essential for the development of magnetic materials and understanding of magnetization processes.
The evico magnetics Kerr Microscope & Magnetometer systems are facilities for the visualisation of magnetic domains and magnetization processes as well as for optically recording magnetization curves on all kinds of magnetic materials, including bulk specimens like sheets or ribbons, magnetic films and multilayers, patterned films or micro- and nanowires. They are semi-automatic, contact-less, non-destructive measuring systems using the magneto-optical Kerr effect (MOKE) as contrast mechanism.
Two microscope systems, both based on Carl Zeiss optics, are offered:
(i) Standard Microscope, and
(ii) Combined High-Resolution & Overview Microscope.
The Standard Microscope is a mechanically stable facility with high-quality optics, suitable for high-resolution domain imaging with spot sizes between approx. 100 µm and 5 mm and down to the resolution limit of optical microscopy (300 nm).
The Combined System is a more flexile setup that combines two microscope versions:
(i) a low-resolution version that allows to obtain an overview of the domain pattern of larger samples with a variable spot size ranging from approx. 30 x 30 mm to 8 x 8 mm
(ii) a high-resolution optical microscope that allows for the same spot size- and resolution ranges as the Standard Microscope.
Both versions are implemented in the same setup and can be used optionally.
For all microscope systems, image processing capabilities are provided for contrast enhancement. Magnetic in-plane fields of arbitrary direction can be applied. Optionally, also out-of-plane magnets are available. Magnetization loops on selected spots of the sample surface can be optically measured (MOKE-magnetometry), observing and recording the corresponding domain images at the same time. The microscopes can readily be extended to high- and low temperature observations. Also, quantitative Kerr microscopy and stroboscopic (time-resolved) microscopy can be implemented.
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Features |
Specifications |
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Polarization Microscope |
Zeiss optics |
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Magnifications from 5x to 100x |
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Lenses 1x, 2.5x, and 4x |
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Stage size up to 35 mm, manual X-Y sample shift up to ± 14 mm, manual sample rotation by 360° |
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*Low-resolution version: |
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Allows to obtain an overview of the domain pattern (or magnetization loop) of larger samples with a spot size from approx. 30 by 30 mm down to 10 by 10 mm (zoom optics) |
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Separated illumination and reflection paths |
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Rotatable polarizer, analyzer and compensator module |
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Light Source |
Kerr-LED lamp (Overview microscope version: highly stable LED light source) |
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Various Kerr-sensitivity options (longitudinal, transverse, and polar Kerr sensitivities) |
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Can be obtained in a monochromatic (white light) or dichromatic (blue and red light) version |
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Sensitive low noise digital (cooled) CCD camera |
Frame rate 8.8 - 115 frames/s (resolution dependent) |
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Resolution maximum: 1.37 million pixels (1344 x 1024) |
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Rotatable Electromagnet ("Standard" Magnet) |
Manually rotatble by approx. 360° |
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Supported on a magnet holder with adjustable height, support independent from sample holder |
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Water-cooled |
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In-plane field range from 10-4 T up to 1.40 T |
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Measurement Computer and Software |
Configurated workstation |
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KerrLab software |
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Camera control |
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Magnetic field control |
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Image processing capabilities for high contrast magnetic domain observation (real-time difference imaging technique) |
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Recording of surface hysteresis loops (MOKE magnetometry) with simultaneous domain movement observation |
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