2026-09-23T08:54:01Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/82792 2023-07-11 col_2142_5131 col_2142_13836 com_2142_5130 com_2142_13835 com_2142_234

2015-09-25T20:53:02Z 2015-09-25T20:53:02Z 10000-01-01 2006 2006 Averback, Robert S. Roos, Kimberly Lynn Permalloy nanoparticles are grown in a custom built inert gas condensation system with magnetron sputtering. By careful control of the processing parameters during nucleation, the nanoparticles can be grown with the desired diameter of 5 nm and a narrow size distribution with a standard deviation of ∼0.5 nm. As a result of the nucleation and growth process, the nanoparticles have a polycrystalline structure. Several heating methods are employed in an attempt to recrystallize the nanoparticles. In the end, ultrafast heating with a femtosecond laser system is used to form single crystal nanoparticles. The wavelength of the laser is strongly absorbed by the metal nanoparticles but not by the supporting substrate (a 50 nm thick S1O2 membrane). The ultra short pulse width of 175 fs also reduces the possibility of heat exchange between the particle and the substrate. This rapid heating causes melting of the particle and upon cooling, a single crystalline structure. These single crystal nanoparticles not only fulfill the requirements of the original project but also provide the first clear evidence that melting of metals can be achieved without significant material loss. Two distinct mechanisms of material loss are identified with separate thresholds. Made available in DSpace on 2015-09-25T20:53:02Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 3242975.pdf: 2696270 bytes, checksum: a8f93727a69944bc643fc60d637c4916 (MD5) Previous issue date: 2006 Embargo set by: Seth Robbins for item 84073 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 104 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2006. http://hdl.handle.net/2142/82792 (MiAaPQ)AAI3242975 eng Engineering, Materials Science A Study of Permalloy (Nickel(81)iron(19)) Nanoparticles as Possible Qubits text Materials Science and Engineering Materials Science and Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.