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Reliable control of magnetic vortex chirality in asymmetrically optimized magnetic nanodisk
Zhang Huanhuan,Yu Hai,Zhang Xue-Feng,Yang Xiao-Xue,Shim Je-Ho,Ma Xiao-Ping,Piao Hong-Guang 한국물리학회 2022 Current Applied Physics Vol.43 No.-
Magnetic vortex has attracted attention in the field of information storage because their topological spin structures with chiral bistable states. If the vortex core polarity and vortex circulation sense can be controlled simultaneously in a nanodisk, which will be more beneficial to realize the multi-bit ultrahigh density storage. In this paper, a reliable control scheme for magnetic vortex chirality is proposed by optimizing the structure of Pac- Man-like nanodisk. The results show that the polarity and circulation of the vortex can be controlled simultaneously by changing the direction of the global magnetic field, and even the chiral states of the vortex can be determined by detecting the stray field distribution on the surface of the nanodisk. The optimized Pac-Man-like nanodisk provide an experimental method for the control and detection of magnetic vortex chirality, which will be beneficial to the realization of multi-bit magnetic storage or magnetic logic technology in the future.
Language Reduced Redundancy Tests: A Reexamination of Cloze Test and C-test
( Wen-ying Lin ),( Hsiao-ching Yuan ),( Ho-ping Feng ) 범태평양 응용언어학회 2008 범태평양응용언어학회지 Vol.12 No.1
The purposes of this study are: (1) to investigate whether cloze forms with textdriven deletion method, proposed by Farhady and Keramati (1996), will produce better psychometric properties than standard cloze form; (2) to compare the psychometric properties of cloze test and C-test, both of which belong to the family of language reduced redundancy test; (3) to examine whether different deletion rates lead to difference in test-takers’ performances; and (4) to test whether the assumption of test-takers’ performance invariance across different texts hold for both cloze test and C-test. Based on two authentic texts with different rhetoric modes, three cloze forms with text-driven deletion method, along with one standard cloze and one form of C-test, were constructed and randomly administered to 237 student subjects at one private university in northern Taiwan. Furthermore, each subject was required to take three subtests (from a sample TOEFL test) as criterion measures for empirical validity. The results of the study indicated that neither the three cloze forms nor the C-test was substantially superior to the standard cloze in terms of reliability and validity. In addition, the findings of the study were inconclusive with regard to whether different deletion rates result in different test-takers’ performances. Finally, no strong evidence was found to substantiate the claim that both cloze test and C-test meet the assumption of test-takers’ performance invariance across different texts.