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Investigation of articial spin ice structures employingmagneto-optical Kerr effect for susceptibility measurements
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics. (Material Physics)
2015 (English)Student paper second term, 10 credits / 15 HE creditsStudent thesis
Abstract [en]

Articial spin ice structures are two-dimensional systems of lithographically fabricated lattices ofelongated ferromagnetic islands, which interact via dipolar interaction. These systems have beenshown to be a suitable playground to study the magnetic, monopole-like, excitations, similar tothose in three-dimensional rare-earth pyrochlores. Therefore, such articial structures can be potentialmaterials for investigations of magnetricity [1]. The investigations of these articial spin icestructures stretches from the direct imaging of the magnetic congurations among the islands to indirectinvestigation methods allowing to determine the phase transitions occurring in such systems. Inthis project, square articial spin ice arrays were investigated employing magneto-optical Kerr eectfor the measurement of the magnetic susceptibility. The susceptibility dependence on temperaturewas measured at dierent frequencies of the applied AC magnetic eld for arrays of the dierentisland spacing and at two dierent incident light directions with the respect to the direction of theislands. A peak shift of the real part of susceptibility, χ', with increasing frequency towards thehigher temperatures was observed. Furthermore, a rough estimation of the relaxation times of themagnetic moments in the islands is given by the analysis of the susceptibility data.

Place, publisher, year, edition, pages
Keyword [en]
artificial spin ice; magnetic susceptibility; magneto-optical Kerr effect
National Category
Condensed Matter Physics
URN: urn:nbn:se:uu:diva-265171OAI: diva2:862735
Educational program
Master Programme in Physics
Available from: 2015-10-28 Created: 2015-10-23 Last updated: 2015-10-28Bibliographically approved

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