Magneto-optical Kerr Effect Measurement System
Magneto-optical Kerr Effect Measurement System
Model：JMTS-816
Product Description:
The magneto-optical Kerr effect device is an ultra-high sensitivity magnetometer designed based on the principle of magneto-optical effect, and is an ideal measurement tool for studying magnetic thin films and magnetic microstructures. Rotational magneto-optical Kerr effect (RotMOKE) is an experimental method similar to torque measurement anisotropy based on magneto-optical Kerr effect measurement, which can quantitatively obtain the value of the magnetic anisotropy of the sample. However, due to the limitation of the size of the magnetic field of the electromagnet, it is only suitable for measuring the magnetic thin film material whose easy axis of magnetic anisotropy is in the film surface and the coercive field is not too large. Combined with the source table, the magnetotransport performance of the sample can be measured. RotMOKE has the following characteristics: high measurement accuracy and short measurement time; non-contact measurement is a non-destructive measurement; the measurement range is one point, which can measure the magnetization of different parts of the same sample; it can generate a smooth and stable controlled magnetic field, And the magnetic field smoothly crosses zero.
Application Areas:
The magneto-optical Kerr effect measurement system is widely used in magnetic fields such as magnetic nanotechnology, spintronics, magnetic thin films, magnetic random access memory, GMR/TMR and so on.
Testable Materials:
Recording heads, magnetic films, special magnetic media, magnetic field sensors
Features:
1. High measurement sensitivity, good stability and low noise
2. Non-contact measurement, which is a non-destructive measurement
3. Wedge-shaped magnetic films with different thicknesses of the same sample can be measured
4. The sample can be placed in a vacuum for in-situ measurement
5. It can measure the magnetization of different parts of the same sample
6. Longitudinal, lateral and polar Kerr effect tests
7. Three hundred and sixty-degree electric rotation of the sample, which can test the anisotropy of the sample
8. Manually move the sample left and right and up and down, which can test the Kerr effect of different points on the surface of the sample
9. The sample holder has an electrical interface, which can be added to the magnetoelectric coupling test.
Technical Indicators:
1. Sample size: Φ10mm circle
2. Kerr angle resolution (δ): 0.001 degrees;
3. Ellipsometry resolution (ε): 0.1%;
4. Small spot (Φ): 10 microns;
5. Large magnetic field: single dimension 0.26 Tesla;
6. The electric angle step of the sample is 0.1 degrees, and the manual displacement step is 10 microns;
7. Noise: 1%.
Technical Parameter:
1. Optical Platform:
Rigid vibration isolation, stainless steel veneer, 1200*800*800mm, M6 screw hole, 25mm pitch, 150mm plate thickness, with casters. The flatness of the table surface is 0.1/1000mm, the platform load is 300Kg, the natural frequency is ≤2.5Hz, and the damping ratio is 0.12~0.13R/S.
2. Vector electromagnet:
Jinzhengmao's two-dimensional vector electromagnet has a large magnetic field of 0.26T per dimension, a pole face diameter of 30mm, a magnetic field gap of 40mm, and a uniform area of 1% in a 10mm center square.
3. Electromagnet power supply:
Jinzhengmao single-phase bipolar constant current, large 10A, small resolution 0.1mA, stability 50ppm/h, corresponding to small resolution 0.1Gauss.
4. Laser:
Newport 632.8nm, 2mW, 2% stability, noise <1% rms (30Hz~10MHz), the spot size is 10μm circle through the focusing lens.
5. Polarizer/Analyzer:
Glan-Thompson prism, outer diameter 25.4mm, clear aperture 10mm, extinction ratio <5*10^-5, angle range 14~16°, wavelength range 350~2300nm.
6. Focusing lens:
K9 biconvex, design wavelength 633nm, outer diameter 25.4mm, focal length 150mm, focal length error ±0.5%, surface accuracy X direction λ/4, Y direction λ/2.
7. Quarter wave plate:
Ø25.4mm, wavelength 632.8nm, projected wavefront distortion λ/8, phase delay accuracy λ/100.
8. Photoelectric sensor:
15mm² sensing area, 0.21A/W responsivity, 1nA dark current, sensitive to 430~900nm wavelength light, shunt resistance 200Mohm.
9. Current amplifier:
1pA/V large gain, 1MHz bandwidth, maximum input ±5mA, maximum output ±5V, gain accuracy is ±0.05% of output.
10. High-precision voltmeter:
Six and a half digits, small resolution of 0.1μV, 90-day accuracy of 0.002%, 2000 readings/second under four and a half digits precision.
11. Manual displacement and electric rotation of the sample holder:
XYZ three-dimensional displacement, XY stroke 25mm, Z stroke 13mm, rotation 360 degrees, the sample holder is a circle with a diameter of 11mm, and there are electrical connectors on it.
12. Computer:
Lenovo commercial, integrated multi-serial card.
