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Piao, Hong-Guang,Lee, Hana,Yoon, Jungbum,Kim, Dong-Hyun,You, Chun-Yeol,Kim, Tae Wan IEEE 2010 IEEE transactions on magnetics Vol.46 No.6
<P> We have investigated a ratchet effect of magnetic domain wall in asymmetric sawtooth-shaped ferromagnetic nanowires under high frequency AC magnetic fields by means of micromagnetic simulation. The ratchet phenomenon has been intensively examined during the domain wall propagation with variation of the asymmetric sawtooth geometry of nanowires as well as variation of the AC external field frequency/strength. Very interestingly, it has been found that there is a strong correlation between the spatial frequency of asymmetrical notches and the effective driving frequency/strength of AC external fields. It is demonstrated that number of notches swept by domain wall ratchet motion per each half-cycle of the driving frequency is controlled under a GHz AC driving field. </P>
Piao, Guang-Ri,Cui, Mei-Hong The Youngnam Mathematical Society 2017 East Asian mathematical journal Vol.33 No.4
This paper studies the relationship between the college entrance examination scores and college mathematics achievements of the freshman, who are the students of college of technology and management in Yanbian University, by employing statistical analysis. First of all, we start from the correlation analysis of the majors and regions of students. Secondly, with gender and region as the classification, we divide the sample into two parts and test the mean significance, and we find that not only different gender but also different region have significant differences to college mathematics achievements. Thirdly, we use the college entrance examination scores as independent variable, and college mathematics achievement as the dependent variable to establish regression model. The model provides a realistic basis for the education department of our school, and provides reference value for the other major research.
GUANG-RI PIAO,Mei-Hong Cui 영남수학회 2017 East Asian mathematical journal Vol.33 No.4
This paper studies the relationship between the college en- trance examination scores and college mathematics achievements of the freshman, who are the students of college of technology and management in Yanbian University, by employing statistical analysis. First of all, we start from the correlation analysis of the majors and regions of students. Secondly, with gender and region as the classification, we divide the sample into two parts and test the mean significance, and we find that not only dif- ferent gender but also different region have significant differences to college mathematics achievements. Thirdly, we use the college entrance examina- tion scores as independent variable, and college mathematics achievement as the dependent variable to establish regression model. The model pro- vides a realistic basis for the education department of our school, and provides reference value for the other major research.
Spontaneous Domain Wall Motion at Zero External Magnetic Field in Ferromagnetic Nanowire
Djuhana, D.,Hong-Guang Piao,Je-Ho Shim,Sang-Hyuk Lee,Su-Hyeong Jun,Seong-Cho Yu,Suhk Kun Oh,Dong-Hyun Kim IEEE 2010 IEEE transactions on magnetics Vol.46 No.2
<P>We have explored a spontaneous domain wall motion in ferromagnetic nanowire at zero external magnetic field by means of micromagnetic simulation. Very interestingly, even with no external magnetic field, a spontaneous domain wall motion is observed with a speed about few tens of m/s, which is significant and not negligible in analysis of the domain wall dynamics on nanowires. The spontaneous zero-field wall motion is explained based on the minimization condition of the magnetostatic energy, preferring to have a wire magnetically saturated. Average speed of the spontaneous wall motion is found to increase as the wire thickness increases.</P>
Suppression of Magnetization Ringing After Domain Wall Collision Studied by Micromagnetic Simulation
Dede Djuhana,Hong-Guang Piao,Sang Hyuk Lee,Su-Hyeong Jun,Je-Ho Shim,Dong-Hyun Kim 한국자기학회 2008 Journal of Magnetics Vol.13 No.4
Magnetization ringing following domain wall collision on a ferromagnetic nanowire has been investigated by micromagnetic simulation. Suppressed magnetization ringing is observed with the introduction of a small ribbon to the nanowire. Magnetization ringing has been analyzed in a frequency space by a fast Fourier transform. With the introduction of a small ribbon and/or taping of the wire, the amplitude of ringing is reduced with a shifted frequency peak.