Matches in SemOpenAlex for { <https://semopenalex.org/work/W2515691917> ?p ?o ?g. }
Showing items 1 to 73 of
73
with 100 items per page.
- W2515691917 abstract "This thesis addresses the behaviour of the artificial magnetic Penrose tiling pattern in three different states: the as-fabricated state, the ac demagnetised state and the thermally annealed state. The artificial magnetic Penrose tiling comprises magnetic nano-elements, which aretermed islands, forming a Penrose tiling patterned from a 2-D film. The main focus is the energy minimisation effect of these three protocols and the effect of frustration on the thermal fluctuation processes. The experimental investigations were conducted via magnetic force microscopy.A well-defined ground state for the Penrose pattern was theoretically predicted based on consideration of the nearest neighbour dipolar interaction. In this predicted ground state, a twofold degenerate rigidframework that spans the system is interspersed with islands for which the moment direction is not defined, since both directions are energetically degenerate. The experimental samples were then characterisedin terms of the population of the rhombuses which are the basic units of the Penrose tiling. The predicted long-range order in the system-spanning framework was not found from any states in the experiments. Further to this, a correlation function was defined for this pattern and evaluated for the three different states. The correlation length extracted from the correlation function indicates that the thermally annealed state has longer range order than other two states, and this conclusion is corroborated by the domain size measurement from colour mapping of domains (the configuration of arrays are mapped by different colours depending on whether the configuration is the as or different to the ground state). The moments of the nano-elements are found to be only locally correlated in the thermally annealed samples,which was believed to be due to the blocking temperature distribution emerging during the thermal annealing process. However, this hypothesis failed to explain an anomaly in the vertex energy distributions from the thermally annealed samples. One certain type of vertex was found be stuck in a high energy state rather than the lowest energy state after the thermal annealing. Based on the blocking temperatureestimation and magneto-static energy calculation, the energy distribution of each vertex at the blocking temperature was found to follow the Boltzmann distribution multiplied by a degeneracy factor. This result agrees with the vertex energy distribution extracted from the experiments at room temperature. This agreement shows that the energy minimization of the Penrose tiling is restricted by the ratio of vertex energy and the blocking temperature, giving a guide for future investigations." @default.
- W2515691917 created "2016-09-16" @default.
- W2515691917 creator A5054104892 @default.
- W2515691917 date "2016-02-01" @default.
- W2515691917 modified "2023-09-24" @default.
- W2515691917 title "Energy Minimization and Thermal Fluctuation in ArtificialMagnetic Penrose Ice" @default.
- W2515691917 hasPublicationYear "2016" @default.
- W2515691917 type Work @default.
- W2515691917 sameAs 2515691917 @default.
- W2515691917 citedByCount "0" @default.
- W2515691917 crossrefType "dissertation" @default.
- W2515691917 hasAuthorship W2515691917A5054104892 @default.
- W2515691917 hasConcept C121332964 @default.
- W2515691917 hasConcept C121864883 @default.
- W2515691917 hasConcept C126255220 @default.
- W2515691917 hasConcept C147764199 @default.
- W2515691917 hasConcept C14961307 @default.
- W2515691917 hasConcept C159985019 @default.
- W2515691917 hasConcept C173523689 @default.
- W2515691917 hasConcept C192562407 @default.
- W2515691917 hasConcept C204323151 @default.
- W2515691917 hasConcept C204530211 @default.
- W2515691917 hasConcept C26873012 @default.
- W2515691917 hasConcept C33923547 @default.
- W2515691917 hasConcept C38710091 @default.
- W2515691917 hasConcept C62520636 @default.
- W2515691917 hasConcept C69523127 @default.
- W2515691917 hasConcept C72319582 @default.
- W2515691917 hasConcept C97355855 @default.
- W2515691917 hasConceptScore W2515691917C121332964 @default.
- W2515691917 hasConceptScore W2515691917C121864883 @default.
- W2515691917 hasConceptScore W2515691917C126255220 @default.
- W2515691917 hasConceptScore W2515691917C147764199 @default.
- W2515691917 hasConceptScore W2515691917C14961307 @default.
- W2515691917 hasConceptScore W2515691917C159985019 @default.
- W2515691917 hasConceptScore W2515691917C173523689 @default.
- W2515691917 hasConceptScore W2515691917C192562407 @default.
- W2515691917 hasConceptScore W2515691917C204323151 @default.
- W2515691917 hasConceptScore W2515691917C204530211 @default.
- W2515691917 hasConceptScore W2515691917C26873012 @default.
- W2515691917 hasConceptScore W2515691917C33923547 @default.
- W2515691917 hasConceptScore W2515691917C38710091 @default.
- W2515691917 hasConceptScore W2515691917C62520636 @default.
- W2515691917 hasConceptScore W2515691917C69523127 @default.
- W2515691917 hasConceptScore W2515691917C72319582 @default.
- W2515691917 hasConceptScore W2515691917C97355855 @default.
- W2515691917 hasLocation W25156919171 @default.
- W2515691917 hasOpenAccess W2515691917 @default.
- W2515691917 hasPrimaryLocation W25156919171 @default.
- W2515691917 hasRelatedWork W1968553984 @default.
- W2515691917 hasRelatedWork W1985459933 @default.
- W2515691917 hasRelatedWork W2021087788 @default.
- W2515691917 hasRelatedWork W2025992938 @default.
- W2515691917 hasRelatedWork W2028192853 @default.
- W2515691917 hasRelatedWork W2029800660 @default.
- W2515691917 hasRelatedWork W2036306383 @default.
- W2515691917 hasRelatedWork W2039063168 @default.
- W2515691917 hasRelatedWork W2079846260 @default.
- W2515691917 hasRelatedWork W2082149589 @default.
- W2515691917 hasRelatedWork W2126597831 @default.
- W2515691917 hasRelatedWork W2164812020 @default.
- W2515691917 hasRelatedWork W2264690927 @default.
- W2515691917 hasRelatedWork W2316548445 @default.
- W2515691917 hasRelatedWork W2418415922 @default.
- W2515691917 hasRelatedWork W2911386114 @default.
- W2515691917 hasRelatedWork W3100804195 @default.
- W2515691917 hasRelatedWork W3126587873 @default.
- W2515691917 hasRelatedWork W3200231946 @default.
- W2515691917 hasRelatedWork W374225306 @default.
- W2515691917 isParatext "false" @default.
- W2515691917 isRetracted "false" @default.
- W2515691917 magId "2515691917" @default.
- W2515691917 workType "dissertation" @default.