Surface magneto-optical Kerr device

The utility model belongs to optics technical area, specifically relating to a surface magneto-optical Kerr effect device which is provided with a polarizing prism, a light splitter, a detector, an operational amplifier, a microchip, and a computer. In the light path system of existent magneto-optical Kerr effect device, a light splitter is arranged between the polarizing prism and the specimen, and a detector is arranged between the light splitter and the control computer, the light splitter separates the outgoing light from the polarizing prism into two beams, one beam is aligned with the detector, the other beam is aligned with the specimen. The computer scans the magnetic field by controlling the magnetic field power and the relay through a D/A card. The data is sampled through an A/D card and displayed as a figure after calculation, and the scanning process of the hysteresis curve can be directly seen on the screen. The utility model can measure 5nm thick alloy membrane and nanometer structured magnetic membrane of high-convergence laser speckle as small as 2.8um. The utility model is simple in structure and convenient for operation.