Longitudinal Magneto-Optical Kerr Effect of Nanoporous CoFeB and W/CoFeB/W Thin Films
Source abstract
Abstract
Nanoporous Co40Fe40B20 (CoFeB) and sandwich tungsten (W)/CoFeB/W thin films were fabricated via an anodic aluminum oxide (AAO) template-assisted magneto sputtering process. Their thickness-dependent magneto-optical Kerr effect (MOKE) hysteresis loops were investigated for enhanced Kerr rotation. Control of the Kerr null points of the polarized reflected light can be realized via the thicknesses of the CoFeB layers and W layers. Simulation of the thickness-dependent phase difference change by the finite element method reveals the existence of the two Kerr null points for W/CoFeB/W thin films, matching the experimental result very well. However, there are two additional Kerr null points for pure CoFeB thin films according to the simulation by comparing with the experimental result (only one). Theoretical analysis indicates that the different Kerr null points between the experimental result and the simulation are mainly due to the enhanced inner magnetization in the ferromagnetic CoFeB layer with the increased thickness, which is usually omitted in the simulation. Clearly, the introduction of non-ferromagnetic W layers can experimentally regulate the Kerr null points of ferromagnetic thin films. Moreover, construction of W/CoFeB/W sandwich thin films can greatly increase the highest magneto-optical susceptibility and the saturated Kerr rotation angle when compared with CoFeB thin films of the same thickness.
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Research context
OpenAlex topics: Magnetic properties of thin films · Magneto-Optical Properties and Applications · Neural Networks and Reservoir Computing
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Research Center of Modern Physics Technology, Beijing Engineering Research Center of Detection and Application for Weak Magnetic Field, School of Mathematics and Physics, University of Science and Technology Beijing, 30 Xueyuan Road, Beijing 100083, China
School of Mathematics and Physics, Hebei GEO University, 136 East Huai’an Road, Yuhua District, Shijiazhuang 050031, China
Shunde Graduate School, University of Science and Technology Beijing, 2 Daliang Zhihui Road, Shunde Distinct, Foshan 528399, China
Physics and Technology Institute, Vernadsky Crimean Federal University, Vernadskogo av. 4, 295007 Simferopol, Russia
NTI Center for Quantum Communications, National University of Science and Technology MISiS, Leninsky Prospekt 4, 119049 Moscow, Russia
Photonic and Quantum Technologies School, Lomonosov Moscow State University, Leninskie Gori, 119991 Moscow, Russia
Key Laboratory of Pulsed Power Translational Medicine of Zhejiang Province, Hangzhou 310000, China
Funding
National Natural Science Foundation of China · the Ministry of Science and Higher Education of the Russian Federation · National S & T Major Project of China · China Postdoctoral Science Foundation · the Postdoctor Research Foundation of Shunde Graduate School of University of Science and Technology Beijin
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