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System for synchronously measuring polar magneto-optic Kerr spectrum and magnetic circular dichroism spectrum

A dichroic and simultaneous measurement technology, applied in the fields of magnetism and semiconductor spintronics, can solve problems such as poor signal-to-noise ratio, difficult sample preparation, and single measurement purpose, achieving good contrast and shortening time

Inactive Publication Date: 2014-06-25
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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Problems solved by technology

[0005] Generally, the magneto-optic spectroscopy measurement system is divided into transmission type and reflection type. The transmission type magneto-optic spectroscopy measurement system cannot measure the magneto-optic spectrum of opaque samples, and the sample preparation is extremely difficult.
At the same time, most reflective magneto-optical spectroscopy measurement systems are based on electromagnets and helium cycle refrigerators, which have a single measurement purpose, inflexible configuration schemes, poor signal-to-noise ratio, and cannot change the temperature and magnetic field at the same time

Method used

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  • System for synchronously measuring polar magneto-optic Kerr spectrum and magnetic circular dichroism spectrum
  • System for synchronously measuring polar magneto-optic Kerr spectrum and magnetic circular dichroism spectrum

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Embodiment Construction

[0037] 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.

[0038] see figure 1 as shown, figure 1 It is a structural schematic diagram of a simultaneous measurement system for polar magneto-optical Kerr (KERR) spectrum and magnetic circular dichroism (MCD) spectrum provided by the present invention, and the system includes:

[0039]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 refl...

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Abstract

The invention discloses a system for synchronously measuring a polar magneto-optic Kerr spectrum and a magnetic circular dichroism spectrum, comprising a liquid helium refrigerator, a low-temperature superconducting magnet system, a super-continuous white light source, a monochromator, a chopper, two Glan-Taylor prisms, a photoelastic modulator, a broadband depolarizing beam splitter prism, an achromatic lens, a silicon detector, three lock-in amplifiers and a computer. With the system provided by the invention, the polarized magneto-optic Kerr (KERR) spectrum and the magnetic circular dichroism (MCD) spectrum of a sample can be simultaneously measured, so that the magnetism, as well as energy band structure and properties related to spinning of substances can be further studied.

Description

technical field [0001] The invention relates to the technical fields of magnetism and semiconductor spintronics, and is especially suitable for measuring the spin-related optical properties of semiconductor spintronics materials (such as dilute magnetic semiconductor materials), and provides a polar magneto-optical Kerr (KERR) spectrum and magnetic circular dichroism (MCD) spectrum simultaneous measurement system. Background technique [0002] Because many substances have Faraday effect and Kerr effect, magneto-optical spectroscopy detection systems are widely used in the fields of physics, chemistry, biology and engineering technology. Especially with the rise of spintronics in recent years, the magneto-optic spectroscopy measurement system, as an important measurement method, has played an important role in the spintronics research. [0003] The full name of MCD is magnetic circular dichroism, that is, under a magnetic field, the absorption rate of matter for left-handed ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/19G01R33/12
Inventor 黄学骄
Owner INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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