Berlin 2015 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 4: Micro- and Nanostructured Materials

MA 4.8: Vortrag

Montag, 16. März 2015, 11:30–11:45, H 1012

Diffracted vectorial magneto-optical magnetometry of ferromagnetic dolmen-like structures — •Lisa Willig^1,2, Junjia Ding³, Adekunle Adeyeye³, Ivan Maksymov², Peter Metaxas², and Mikhail Koystylev² — ¹Institut für Physik und Astronomie, Universität Potsdam, Potsdam, Germany — ²School of Physics, University of Western Australia, Crawley, WA, Australia — ³Electrical and Computer Engineering, National University of Singapore, Singapore, Singapore

Vector and Diffracted magneto-optical Kerr effect measurements were combined to study the magnetisation dynamics during magnetic reversal ferromagnetic dolmen-like structure. The unit cells of the two-dimensional Permalloy (NiFe) array consists of three elements in the submicrometer range (2µm × 0.8µm). This is the first investigation on a system with strongly dipole-dipole coupled unit cells, as the inter-element spacing is just 50nm. The periodicity of the structure leads to a diffraction pattern besides specular reflection. The hysteresis loops of the visible diffracted order beams as well as the specular reflected beam were obtained. In combination with micromagnetic simulations this enables a detailed analysis of the magnetisation reversal in each unit cell. The different diffraction orders correspond to a magnetic order with wavelengths smaller or equal to the length of the unit cell. Additionally measurements of more than one magnetisation component allow the reconstruction of the magnetisation vector during the reversal process.