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Non-linear magneto-optical properties in sputtered and epitaxial ultrathin films
Chunlei Gao,Qing-Yuan Jin,Bin Ma,Jun Ye,Yang Ren 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.44 No.32
The nonlinear magneto-optical properties of polycrystalline Co lms and single crystalline Fe lms epitaxially grown on Co(001) substrate are studied ex situ and in situ, respectively, by the magnetization-induced second harmonic generation (MSHG) technique. The magnetic contrast in MSHG intensity can be clearly distinguished for the cobalt lms, and dependence of the magnetic second harmonic intensity on the thickness of the magnetic lm and a nonmagnetic covering is found, which is the result of the combined contributions of the magnetic surface and interfaces. A giant nonlinear Kerr rotation of more than 2 degrees, being at least an order of magnitude larger than its linear one, is achieved for the polycrystalline Co lms. By using the MSHG method, the magnetic phase transitions of the ultrathin epitaxial Fe lms at a thickness of about 4 ML and 11 ML can be successfully observed, showing sensitivity to the lm structure and magnetic orders. If combined with the magneto-optical Kerr eect (MOKE), more information could be obtained.
Qianqian Dong,Chengwang Xiong,Chunlei Ma,Huajian Wei 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.6
Extensive efforts have been made in the understanding of the failure characteristics of straight fissure, but the failure patterns of rock mass with intermittent non-straight fissures have not been examined comprehensively. To address this problem, the present study investigated the cracking behaviors of natural marble specimens containing double S-shaped fissures under compression. Seven types of coalescence patterns for S-shaped fissures are classified, two of which are firstly reported and featured by the occurrence of the self-coalescence phenomenon. It is found that the decrease of strength is accompanied by the internal crack at the stage of crack growth and propagation, following the occurrence of the external crack, at relatively large flaw and ligament angle. The numerical simulations with the corresponding parameters were carried out for comparison. This research provides helpful information for understanding the failure modes induced by crack propagation of intermittent double S-shaped fissures.