Micromagnetism in mesoscopic epitaxial Fe dot arrays

Autor:	Wooyoung Lee, Luis Lopez-Diaz, J. A. C. Bland, H. T. Leung, Atsufumi Hirohata, H. Launois, M. Tselepi, F. Rousseaux, S. M. Gardiner, Edmond Cambril, Yongbing Xu
Rok vydání:	2000
Předmět:	Condensed Matter::Materials Science Dipole Mesoscopic physics Materials science Condensed matter physics Magnetic domain Quantum dot General Physics and Astronomy Magnetic force microscope Single domain Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Epitaxy Micromagnetics
Zdroj:	Scopus-Elsevier
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.372917
Popis:	The domain structures of epitaxial Fe (20 nm)/GaAs(100) circular dot arrays (diameters from 50 to 1 μm) were studied with magnetic force microscopy. A transition from a single domain to a multidomain remanent state was observed upon reducing the dot diameter beneath 10 μm in dot arrays with the separation twice the dot diameter. When the separation is reduced to half the dot diameter, the single domain states were found to “collapse” into stripe-like multidomain states due to local dipole coupling between dots. Micromagnetic simulations further suggest that for ultrathin Fe dots of less than about 2 nm thickness the diameter does not have a significant influence on the domain structures due to a dramatic reduction of the dipole energy.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::75a307480d54c0d4166f3beca084aa59 https://doi.org/10.1063/1.372917 Zobrazit plný text záznamu