Zhizhen Precision Instrument (Qingdao) Co., Ltd.

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Low-Temperature High-Magnetic-Field Microdomain Laser Kerr Microimaging System

+86-13335086685 Yao Jingli

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Industry Applications

Classification

Magnetic Measuring Instruments

Keywords

Product Description
Technical Indicators
Applications

Product Model:

KMP-L

Product Overview:

● Currently, magneto-optical Kerr effect (MOKE) testing is conducted primarily through two methods. One relies on laser and photoelectric detection for highly precise MOKE magnetic hysteresis loop scanning, while the other combines optical imaging technology with the magneto-optical Kerr effect to form a high-resolution magneto-optical Kerr microscope. Comparatively, the first method has high precision but lacks spatial imaging and microdomain pinpoint detection capabilities, while the second offers high-resolution imaging and microdomain detection capabilities. However, due to the use of a camera as the signal acquisition unit, the detection accuracy of the latter is compromised compared with the former.

● This system is a highly functional characterization system designed specifically for two-dimensional ferromagnetic materials with characteristics such as weak magnetic properties, small sample sizes, partial non-conductivity, high coercivity, and low Curie temperature. It features high magnetic detection precision, microdomain pinpoint measurement, precise spot positioning, as well as high magnetic field and wide temperature ranges. For all these advantages, it is an ideal option for magnetic characterization of the majority of two-dimensional ferromagnetic materials.
Product Features:

Integration of high-resolution magnetic domain imaging with high-precision magnetic hysteresis loop scanning.

● Vertical high magnetic field (1.4 T) and in-plane high magnetic field (1 T)

● Sample temperature range: 5 K–420 K; temperature stability: ±50 mK

Magnetic properties of monolayer materials can be precisely detected through the differential amplification and lock-in techniques.

● It is ideal for precise magnetic measurements of spintronic devices or materials at the micrometer scale.

Main Technical Indicators:

Resolution: 450 nm

● Laser spot: 5 μm

● MOKE testing: It can test in-plane and perpendicular magnetic anisotropy samples, with the Kerr rotation resolution ≤0.5 mdeg.

● Vertical magnetic field intensity: 1.4 T; vertical magnetic field intensity at low temperatures: 0.75 T

● In-plane magnetic field intensity: 1 T; in-plane magnetic field intensity at low temperatures: 0.75 T

● Temperature range: 5 K–800 K

Main Features:

1. High-precision microdomain magneto-optical detection

This system can perform laser focusing and highly precise magnetic hysteresis loop scanning for micrometer-scale single atomic layer materials.

2. High magnetic field

Vertical high magnetic field (1.4 T) and in-plane high magnetic field (1 T)

3. Wide temperature range

Sample temperature range: 5 K–420 K (liquid helium); 80 K–420 K (liquid helium); 300 K–800 K (high temperature)

4. Highly stable temperature

Flow control and heat compensation: ≤±50 mK 5 K

5. Low sample vibration

The cryostat, internally fixed and externally damped, achieves sample vibrations within ±100 nm.
With a micrometer-scale spot and precise positioning in the sample measurement area, the magnetic hysteresis loops in the microdomain is precisely detected.

At a temperature of 4 K, magnetic domain reversal is observed using a 50X objective, and the Kerr rotation angle is measured using laser techniques.

Magnetic hysteresis loops of in-plane samples are measured with laser at room temperature and compared with VSM test results.

Magnetic domain observation: Polar Kerr Effect

Magnetic domain observation: Polar Kerr Effect, a comparison between original and differential images