Dynamical pinning of a domain wall in a magnetic nanowire induced by Walker breakdown.
Transmission probability of a domain wall through a magnetic nanowire is investigated as a function of the external magnetic field. A very intriguing phenomenon is found that the transmission probability shows a significant drop after exceeding the threshold driving field, which contradicts our intuition that a domain wall is more mobile in the higher magnetic field. The micromagnetics simulation reveals that the domain wall motion in the wire with finite roughness causes the dynamical pinning due to the Walker breakdown, which semiquantitatively explains our experimental results.
Tanigawa
Hironobu
H
Institute for Chemical Research, Kyoto University, Uji, 611-0011, Kyoto, Japan.
Koyama
Tomohiro
T
Bartkowiak
Maciej
M
Kasai
Shinya
S
Kobayashi
Kensuke
K
Ono
Teruo
T
Nakatani
Yoshinobu
Y