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Statistical properties of telegraph noise generated by magnetic domain wall
Seyyoung Jeon,Seong-Hyub Lee,Jiho Shin,Sug-Bong Choe 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.2
Telegraph noise, the certain type of signals which consists of sudden jumps between two or more levels, can be observed in several systems for example CMOS, memristor, and magnetic domain wall. The behavior of telegraph noise looks so random that there have been several approaches to utilize this noise to generate random numbers. In this study, as the foundation work for random number generator, some statistical properties are extracted from the telegraph noise generated by domain wall between two metastable states. Telegraph noise is measured by magneto-optic Kerr effect (MOKE) signal from the domain wall of the perpendicularly magnetized Pt/Co/W thin film. Applying field in the direction which makes domain wall escape from the pinning site results in telegraph noise of MOKE signal. As shown in figure 1, signal jumps up when the domain wall is depinned. By fitting cumulative probability function depending on depinning time, the energy barrier of domain wall depinning is also estimated. 〈그림 본문참조〉
Energy landscape study by telegraph noise of domain wall motion
Jeon Seyyoung,Lee Seong-Hyub,Choe Sug-Bong 한국물리학회 2022 Current Applied Physics Vol.44 No.-
The energy barrier landscape in-between two adjacent pinning sites of magnetic domain wall was investigated by telegraph noise of domain wall motion. The telegraph noise provided numerous depinning times for each pinning site, from which the depinning energy barrier characteristics were extracted. By generating the telegraph noise under application of magnetic field and electric current, the energy barrier landscape could be reconstructed with the barrier height and lateral size of the adjacent pinning sites. The lateral size fits well with other independent estimation based on the signal level with the focused laser beam, providing the validity of the present approach.
Magnetic interactions in PdCrO2 and their effects on its magnetic structure
Le, Manh Duc,Jeon, Seyyoung,Kolesnikov, A. I.,Voneshen, D. J.,Gibbs, A. S.,Kim, Jun Sung,Jeong, Jinwon,Noh, Han-Jin,Park, Changhwi,Yu, Jaejun,Perring, T. G.,Park, Je-Geun American Physical Society 2018 Physical Review B Vol.98 No.2