Kim, Kab-Jin Gim, Gi-Hong Lee, Jae-Chul Ahn, Sung-Min Lee, Kang-Soo Cho, Young Jin Lee, Chang-Won Seo, Sunae Shin, Kyung-Ho Choe, Sug-Bong 2024-01-20T20:33:35Z 2024-01-20T20:33:35Z 2021-09-05 2009-10 0018-9464 https://pubs.kist.re.kr/handle/201004/132104 In this paper, we experimentally characterize the domain-wall depinning mechanism at notches of ferromagnetic nanowires with perpendicular magnetic anisotropy. A time-resolved magneto-optical Kerr effect detection reveals that the depinning time is exponentially proportional to the strength of external magnetic field. From an analysis based on Neel-Brown theory, the depinning field and the activation volume are quantitatively determined for several notches with different gap distances. Interestingly, both the depinning field and the activation volume are proportional to the inverse of the gap distance. This is explained by the sizeable extrinsic effect from geometric constrictions in contrast to the intrinsic properties of the films. English IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC WALL-MOTION DOMAIN Depinning Field at Notches of Ferromagnetic Nanowires With Perpendicular Magnetic Anisotropy Article 10.1109/TMAG.2009.2024893 1 IEEE TRANSACTIONS ON MAGNETICS, v.45, no.10, pp.4056 - 4058 IEEE TRANSACTIONS ON MAGNETICS 45 10 4056 4058 scie scopus 000270149700166 2-s2.0-70350587337 Engineering, Electrical & Electronic Physics, Applied Engineering Physics Article; Proceedings Paper WALL-MOTION DOMAIN Activation volume depinning field gap distance notch perpendicular magnetic anisotropy