Surface Magneto-optic Kerr Effect System

The DXMOKE series surface magneto optical Kerr effect system can directly obtain the longitudinal, transverse and polar Kerr rotation angle or the hysteresis loop of ellipticity, and can also obtain magnetic properties such as coercive force and saturation magnetic field. The magneto-optical Kerr effect system(MOKE) is an ideal tool for studying magnetic thin films, magnetic nanostructures and spintronics.

Features of DXMOKE Surface magneto-optic Kerr effect system

1. Using TTL to modulate a low-noise laser light source;
2. Using a high-sensitivity photoelectric sensor tube to receive light-intensity signals; 
3. Using a lock-in amplifier to collect frequency-locked signals;

4. Low noise, high resolution and high stability;

5. All optical devices are highly integrated, and the user only needs to install the sample and fine-tune the sample rod to obtain the Kerr signal;

6. Integrated Kerr effect measurement and magnetic domain observation microscope observation, the microscopic resolution is 6um;

7. It can measure in situ under a vacuum and has a variety of magnetic field and cryogenic options.

Basic Function of DXMOKE Surface magneto-optic Kerr effect system

1. Single-point loop: longitudinal, transverse and polar Kerr effect tests;

2. Area mapping: finely move the sample up, down, left, and right to test the magneto-optical Kerr effect at different points on the sample surface;

3. Rotate the sample or magnetic field at 360 degrees to determine the difficult and easy axis of material magnetization and test anisotropy;

4. The sample holder has an electrical interface, which can be added to the magnetoelectric coupling test.

5. Integrating a high-speed CCD and a microscope system, it is possible to observe the surface topography of the material. After adding a polarizer, it can also detect the difference in the distribution of the intensity of the light spot caused by the change of the polarization state with the magnetic field, so as to obtain the magnetic domain.

Technical Parameters of DXMOKE Surface Magneto-optic Kerr System

Kerr angle resolution: less than 0.001 degrees;

Ellipse resolution: less than 0.1%;

Minimum spot: 10 microns;

Maximum magnetic field: 2.2T (select EM7 electromagnet);

The rotation angle step is 0.1 degrees, and the up, down, left, and right displacement steps are 10 microns;

Noise: less than 1%.

Cryogenic option

Temperature range: 100K ~ 300K;
Temperature control accuracy: ±0.01°C;
Cooling time: 30 min to 100K;
Heating rate: 0.01 ~ 30°C/min;
The sample is in a vacuum environment;
K9 glass optical window to minimize magneto-induced optical rotation.

In physics, the magneto-optic Kerr effect (MOKE) or the surface magneto-optic Kerr effect (SMOKE) is one of the magneto-optic effects. It describes the changes to light reflected from a magnetized surface.

The Kerr angle is the angle that linearly polarized light will be rotated after hitting the sample. The Kerr ellipticity (not to be confused with ellipticity from mathematics) is the ratio of the semimajor and semiminor axes of the elliptically polarized light, generated from reflection of linearly polarized light. 

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