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

Abstract

The invention discloses a method for detecting anisotropy of lanthanum calcium manganese oxygen based on terahertz waves. The method comprises the following steps of testing a sample under two conditions that a magnetic field is perpendicular to the surface of the sample and the magnetic field is parallel to the surface of the sample by utilizing electromagnetic waves in the terahertz frequency band in order to obtain a time-domain terahertz transmitted spectrum changing along with the magnetic field of the lanthanum calcium manganese oxygen under the conditions of 210K, 105 k and 30K; and recording terahertz peak values under the corresponding temperature and the magnetic field. According to the method, a change relation of the terahertz peak values at different temperatures along with the magnetic field is drawn, so that the anisotropy of the sample at different temperature and the lanthanum calcium manganese oxygen in different directions of magnetic field configuration is obtainedthrough an optical method. The method is strong in electromagnetic wave penetrability of the terahertz frequency band, free of contact and electrode preparation, easy to operate, non-destructive to asample to be detected, and better in anisotropy effect of the lanthanum calcium manganese oxide sample.

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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