{"id":{"repo_id":"u-iceland","oai_identifier":"oai:skemman.is:1946/35490"},"canonical_url":"https://search.dev.ndltd.org/etd/u-iceland/oai:skemman.is:1946/35490","repository":{"repo_id":"u-iceland","name":"University of Iceland","base_url":"https://skemman.is/oai/request"},"display":{"title":"Micromagnetic modelling and magneto-optical characterization of Ni/V2O3 hybrid structures","abstract":"Magnetic behaviour of five bi-layer V2O3/Ni thin film samples sputtered on sapphire, Al2O3, were investigated using MOKE (magneto-optic Kerr effect). Three samples show a fourfold symmetry in coercivity with very small but similar change in magnetic remanence. For comparison micromagnetic simulations were done in Mumax3. The samples have a well defined growth direction, [111], so simulations were setup to replicate this. Nickel is a cubic crystal with easy axes <111>, hard axes <100> and medium axes <110>. In the simulations an external magnetic field was applied and then rotated in-plane as was done in the MOKE measurements. The result are hysteresis loops as a function of azimuthal angle yielding the normalized magnetic remanence and coercive field. This was done for two sample sizes with number of cells in x-, yand z- direction 128x128x2 and 256x256x2 both having cell size 4x4x10nm. The results did not change when sample size was increased. These simulations were done both for growth direction [111] and [100] out of plane. Quantitatively the results from simulations agree with magneto-crystalline energy for nickel, both when rotated around [111] and [100], showing a sixfold and fourfold symmetry respectively. The measured samples don’t show this sixfold symmetry.","abstract_html":"Magnetic behaviour of five bi-layer V2O3/Ni thin film samples sputtered on sapphire, Al2O3, were investigated using MOKE (magneto-optic Kerr effect). Three samples show a fourfold symmetry in coercivity with very small but similar change in magnetic remanence. For comparison micromagnetic simulations were done in Mumax3. The samples have a well defined growth direction, [111], so simulations were setup to replicate this. Nickel is a cubic crystal with easy axes &lt;111&gt;, hard axes &lt;100&gt; and medium axes &lt;110&gt;. In the simulations an external magnetic field was applied and then rotated in-plane as was done in the MOKE measurements. The result are hysteresis loops as a function of azimuthal angle yielding the normalized magnetic remanence and coercive field. This was done for two sample sizes with number of cells in x-, yand z- direction 128x128x2 and 256x256x2 both having cell size 4x4x10nm. The results did not change when sample size was increased. These simulations were done both for growth direction [111] and [100] out of plane. Quantitatively the results from simulations agree with magneto-crystalline energy for nickel, both when rotated around [111] and [100], showing a sixfold and fourfold symmetry respectively. The measured samples don’t show this sixfold symmetry.","abstract_has_math":false,"creators":["Björn Áki Jósteinsson 1996-"],"institution":null,"degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":["Háskóli Íslands"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2020,"date_issued":"2020-05-20T14:53:39Z","date_published":"2020-05-20T14:53:39Z","updated_at":"2026-07-27T21:42:56Z","subjects":["Verkfræðileg eðlisfræði"],"languages":["en"],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/1946/35490","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Háskóli Íslands"]},{"key":"dc:creator","label":"Author","values":["Björn Áki Jósteinsson 1996-"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2020-05-20T14:53:39Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2020-05-20T14:53:39Z"]},{"key":"dc:date.issued","label":"Date","values":["2020-05-20T14:53:39Z"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Verkfræðileg eðlisfræði"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/1946/35490"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Magnetic behaviour of five bi-layer V2O3/Ni thin film samples sputtered on sapphire, Al2O3, were investigated using MOKE (magneto-optic Kerr effect). Three samples show a fourfold symmetry in coercivity with very small but similar change in magnetic remanence. For comparison micromagnetic simulations were done in Mumax3. The samples have a well defined growth direction, [111], so simulations were setup to replicate this. Nickel is a cubic crystal with easy axes <111>, hard axes <100> and medium axes <110>. In the simulations an external magnetic field was applied and then rotated in-plane as was done in the MOKE measurements. The result are hysteresis loops as a function of azimuthal angle yielding the normalized magnetic remanence and coercive field. This was done for two sample sizes with number of cells in x-, yand z- direction 128x128x2 and 256x256x2 both having cell size 4x4x10nm. The results did not change when sample size was increased. These simulations were done both for growth direction [111] and [100] out of plane. Quantitatively the results from simulations agree with magneto-crystalline energy for nickel, both when rotated around [111] and [100], showing a sixfold and fourfold symmetry respectively. The measured samples don’t show this sixfold symmetry."]},{"key":"dc:title","label":"Title","values":["Micromagnetic modelling and magneto-optical characterization of Ni/V2O3 hybrid structures"]}]}],"canonical_facts":{"dc:contributor":["Háskóli Íslands"],"dc:creator":["Björn Áki Jósteinsson 1996-"],"dc:date.accessioned":["2020-05-20T14:53:39Z"],"dc:date.available":["2020-05-20T14:53:39Z"],"dc:date.issued":["2020-05-20T14:53:39Z"],"dc:description.abstract":["Magnetic behaviour of five bi-layer V2O3/Ni thin film samples sputtered on sapphire, Al2O3, were investigated using MOKE (magneto-optic Kerr effect). Three samples show a fourfold symmetry in coercivity with very small but similar change in magnetic remanence. For comparison micromagnetic simulations were done in Mumax3. The samples have a well defined growth direction, [111], so simulations were setup to replicate this. Nickel is a cubic crystal with easy axes <111>, hard axes <100> and medium axes <110>. In the simulations an external magnetic field was applied and then rotated in-plane as was done in the MOKE measurements. The result are hysteresis loops as a function of azimuthal angle yielding the normalized magnetic remanence and coercive field. This was done for two sample sizes with number of cells in x-, yand z- direction 128x128x2 and 256x256x2 both having cell size 4x4x10nm. The results did not change when sample size was increased. These simulations were done both for growth direction [111] and [100] out of plane. Quantitatively the results from simulations agree with magneto-crystalline energy for nickel, both when rotated around [111] and [100], showing a sixfold and fourfold symmetry respectively. The measured samples don’t show this sixfold symmetry."],"dc:identifier.uri":["http://hdl.handle.net/1946/35490"],"dc:language.iso":["en"],"dc:subject":["Verkfræðileg eðlisfræði"],"dc:title":["Micromagnetic modelling and magneto-optical characterization of Ni/V2O3 hybrid structures"],"dc:type":["Thesis"]},"updated_at":"2026-07-27T21:42:56Z"}