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Magnetic circular dichroism photoconduction spectrum measurement system

A circular dichroism and measurement system technology, which is applied in the direction of measuring devices, material analysis through optical means, instruments, etc., can solve problems such as difficult resolution, and achieve the effect of shortening time

Inactive Publication Date: 2012-09-19
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

Usually, however, this difference is very small, and the noise of the measurement system itself makes it difficult to distinguish this difference

Method used

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  • Magnetic circular dichroism photoconduction spectrum measurement system
  • Magnetic circular dichroism photoconduction spectrum measurement system
  • Magnetic circular dichroism photoconduction spectrum measurement system

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Embodiment Construction

[0032] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0033] see figure 1 as shown, figure 1 It is a structural schematic diagram of a magnetic circular dichroic photoconductive spectrum (PC-MCD) measurement system provided by the invention, and the system includes:

[0034] A supercontinuum white light source, the output light of which passes through the monochromator is used as the sample test light source. A monochromator, which filters the outgoing light of the white light source, and only selects light of a single wavelength to pass through. A chopper, which chops and modulates the light emitted by the monochromator, and provides a reference signal for the lock-in amplifier, so as to obtain the intensity of the photoconductance of the sample. A Glan-Taylor prism conv...

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Abstract

The invention discloses a magnetic circular dichroism photoconduction spectrum measurement system which comprises a liquid helium refrigerating machine, a low-temperature superconducting magnet system, an ultra-continuous white light source, a monochromator, a chopper, a Glan-Taylor polarizer, a photoelastic modulator, an achromatic lens, a current source, two phase-locking amplifiers and a computer. By using the magnetic circular dichroism photoconduction spectrum measurement system, the magnetic circular dichroism (PC-MCD) can be measured, therefore, the magnetic properties of a material and the spin-dependent energy band structure and characteristics can be further researched.

Description

technical field [0001] The invention relates to the technical fields of magnetism and semiconductor spintronics, and is especially suitable for the research on the spin-related optical and electrical properties of semiconductor spintronics materials (such as dilute magnetic semiconductor materials), and provides a magnetic circle two Photochromic photoconductive spectroscopy (PC-MCD) measurement system. Background technique [0002] In recent years, spintronics has gradually emerged. Magneto-optical spectroscopy and electrical measurements, as important measurement methods, have played an important role in the study of spintronics. [0003] The full name of MCD is magnetic circular dichroism, that is, under a magnetic field, the absorption rate of matter for left-handed circularly polarized light and right-handed circularly polarized light is different. It is an important means to study the magnetic properties of materials. Photoconductivity spectroscopy measures the change...

Claims

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Application Information

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IPC IPC(8): G01N21/19
Inventor 黄学骄王丽国申超朱汇
Owner INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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