Magnetization reversal in patterned double-vortex structures
The magnetization reversal process for micron and submicron disk-shaped dots is controlled by successive nucleation, displacement,and annihilation of a magnetic vortex. Here the reversal process for a system involving two ferromagnetic disks separated by a nonmagnetic spacer is investigated experimentally, analytically, and numerically.Permalloy Ni80Fe20 or Py dots with thicknesses of up to 40 nm and diameters of 0.5-2.5 um separated by a copper spacer 1-45 nm thick were considered. Micromagnetic simulations indicate that the disks will each support oppositely directed vortices at remanence and also show the hysteresis of the coupled structures. The calculations are compared to hysteresis loops and x-ray photoemission electron microscopy images of Py/Cu/Py dots produced by electron-beam lithography and magnetron sputtering.
- Research Organization:
- Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US)
- Sponsoring Organization:
- USDOE Director. Office of Science. Office of Basic EnergySciences. Materials Science and Engineering Division, Argonne NationalLaboratory; Natural Sciences and Engineering Research Council of CanadaFellowship
- DOE Contract Number:
- AC02-05CH11231
- OSTI ID:
- 861596
- Report Number(s):
- LBNL--57795; BnR: KC0204016
- Journal Information:
- Journal of Applied Physics, Journal Name: Journal of Applied Physics Vol. 97; ISSN JAPIAU; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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