Method for detecting anisotropy of lanthanum calcium manganese oxygen based on terahertz waves

Abstract

The invention discloses a method for detecting the anisotropy of lanthanum-calcium-manganese-oxygen based on terahertz waves. The method includes: using electromagnetic waves in the terahertz frequency band to test the samples under the conditions that the magnetic field is vertical and parallel to the sample surface, Obtain the time-domain terahertz transmission spectra of lanthanum calcium manganese oxygen varying with the magnetic field at 210K, 105K and 30K; record the terahertz peaks at the corresponding temperature and magnetic field. Draw the relationship between the terahertz peak value and the magnetic field at different temperatures, from which it can be concluded that the lanthanum-calcium-manganese-oxygen with different directions of the sample and the magnetic field at different temperatures has anisotropy. Electromagnetic waves in the terahertz frequency band have strong penetration, no contact, no need to prepare electrodes, simple operation, non-destructive to the sample to be tested, and better detection of anisotropy of lanthanum calcium manganese oxygen samples.

Description

technical field [0001] The invention relates to the technical field of photoelectric detection, in particular to a method for detecting the anisotropy of lanthanum calcium manganese oxygen based on terahertz waves. Background technique [0002] Strongly correlated perovskite-structured La 1-x Ca x MnO 3 Thin films have received special attention due to exhibiting important physical phenomena such as giant magnetoresistance effect (CMR), anisotropic magnetoresistance effect (AMR) and electron phase separation (EPS). However, these properties are usually characterized by conventional electrical measurements (ρ-T curves) or magnetization-magnetic field (M-H) curves, which cannot be further studied in La 0.3 Ca 0.7 MnO 3 Microscopic mechanism of thin films. At present, in the existing technology, the PPMS comprehensive physical property testing platform is used to detect the anisotropy of the strongly correlated perovskite structure, but it belongs to an electrical testing...

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Problems solved by technology

[0003] Aiming at the problem that the electrical detection method of lanthanum calcium manganese oxygen anisotropy in the prior art is relatively complicated and not convenient for rapid detection, the present invention provides a simple and convenient method for detecting lanthanum calcium manganese oxygen based on terahertz waves without preparing electrodes. anisotropic method

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