Role of boundary conditions and dimensions on the micromagnetics of a cobalt point contact

Autor: K. P. Wellock, R. P. van Gorkom, J. Caro, S. J. C. H. Theeuwen, N. N. Gribov, S. Radelaar
Rok vydání: 1999
Předmět:
Zdroj: Journal of Applied Physics. 85:6196-6198
ISSN: 1089-7550
0021-8979
DOI: 10.1063/1.370219
Popis: We have calculated the micromagnetic structure of a Co point contact, for applied magnetic fields parallel (H∥) and perpendicular (H⊥) to the device’s electrodes. Different boundary conditions and dimensions have been examined. In most situations a Neel wall is formed in the constriction. When the size of the device is reduced (or the exchange stiffness is increased), then the energy barrier between the state with and without the Neel wall is increased. The domain wall magnetoresistance (DWMR) and anisotropic MR (AMR) have been estimated, and they show a maximum in the DWMR for both field directions of the applied magnetic field and a maximum and minimum in the AMR for H∥ and H⊥, respectively.
Databáze: OpenAIRE
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