Vortex Head-to-Head Domain Walls and Their Formation in Onion-State Stable Ring Elements
M H. Park, Y K. Hong, B C. Choi, S H. Gee, Michael J. Donahue
Magnetization configuration of vortex head-to-head (HTH) domain walls and the wall formation process in Ni80Fe20 ring elements were investigated using magnetic force microscopy and micromagnetic simulation. At remanence, two types of vortex HTH domain walls were observed to be stable in the onion configuration, depending on the film thickness: single- and double-vortex HTH domain walls for 40 nm and 65 nm thick ring elements, respectively. As the vortex core nucleated during formation of the HTH domain wall, exchange energy began to decrease, accompanied by an increase in the width of the wall. Vortex nucleation in the 65 nm thick ring was found to be much faster than in the 40 nm thick ring element. This effect can be attributed to the higher initial magnetostatic energy density in the thicker ring.
, Hong, Y.
, Choi, B.
, Gee, S.
and Donahue, M.
Vortex Head-to-Head Domain Walls and Their Formation in Onion-State Stable Ring Elements, Physical Review Letters, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=150022
(Accessed December 2, 2023)