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Description
Title: | The Development of Alkoxy-Based Sol -Gel Processing for Magnetoresistive Manganite Thin Films |
Author(s): | Clothier, Brent Allen |
Doctoral Committee Chair(s): | Payne, David A. |
Department / Program: | Materials Science and Engineering |
Discipline: | Materials Science and Engineering |
Degree Granting Institution: | University of Illinois at Urbana-Champaign |
Degree: | Ph.D. |
Genre: | Dissertation |
Subject(s): | Engineering, Materials Science |
Abstract: | The cubic lattice parameters of the films (i.e., a = ∼ 3.90 A) were in excellent agreement with values published in the literature for bulk, polycrystalline powders. Typical grain sizes started at 10--15 nm, increasing to 20--25 nm by 750°C. For films deposited on Si(100), magnetoresistance was observed in specimens heat treated at 700°C and 750°C, and for platinized-Si(100), 650°C, 700°C, and 750°C. Magnetoresistive response improved with heat-treatment temperature for the more refractory La0.67Ba0.33MnO3 composition. The lead-doped counterpart offered the best property evolution, with TC = 320 K and TIM = 254 K by 750°C on platinized-Si(100). All corresponding transport curves were symmetric, demonstrating clear metal-insulator transitions (i.e., TIM). High resistivities (i.e., ∼ 106 O-cm) were attributed to the fine-grain microstructure. Weak-field cycling between +/-500 Oe yielded symmetrical loops with appreciable linear regions, a highly-desirable characteristic for magnetic sensing applications. |
Issue Date: | 2005 |
Type: | Text |
Language: | English |
Description: | 352 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2005. |
URI: | http://hdl.handle.net/2142/82760 |
Other Identifier(s): | (MiAaPQ)AAI3182241 |
Date Available in IDEALS: | 2015-09-25 |
Date Deposited: | 2005 |
This item appears in the following Collection(s)
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Dissertations and Theses - Materials Science and Engineering
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Graduate Dissertations and Theses at Illinois
Graduate Theses and Dissertations at Illinois