Amanda Haglund
University of Tennessee
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Publication
Featured researches published by Amanda Haglund.
TMS Annual Meeting & Exhibition | 2018
Dan Huang; Ronghui Kou; Jianrong Gao; Amanda Haglund; Jiaqiang Yan; Veerle Keppens; D. Mandrus; Yang Ren
The La(Fe, Si)13 compound shows a large magnetocaloric effect near room temperature. Partial substitution of Co for Fe can raise its Curie temperature and reduce the thermal hysteresis of its ferromagnetic transition. However, the influence of Co substitution on the crystal structure and magnetocaloric properties of La(Fe, Si)13 is not well understood yet. In this work, we report a comparative study of the crystal structure, magnetocaloric effects and elastic moduli of polycrystalline LaFe11.5Si1.5 and LaCoFe10.5Si1.5 samples using synchrotron radiation X-ray diffraction, magnetic measurements and resonant ultrasound spectroscopy. Compared to the Co-free sample, the Co-doped sample shows a sluggish ferromagnetic transition and reduced volumetric expansion as well as softer elastic moduli at room temperature. The Co-doped sample also shows stronger temperature dependence of Fe-Fe distances in its ferromagnetic state. Such differences between the samples are explained by considering the influence of Co doping on ferromagnetic interactions and lattice entropy.
ACS Applied Materials & Interfaces | 2018
Cheng Zhang; Pushpa Raj Pudasaini; Akinola D. Oyedele; Anton V. Ievlev; Liubin Xu; Amanda Haglund; Joo Hyon Noh; Anthony T. Wong; Kai Xiao; Thomas Ward; David Mandrus; Haixuan Xu; Olga S. Ovchinnikova; Philip D. Rack
The formation of an electric double layer in ionic liquid (IL) can electrostatically induce charge carriers and/or intercalate ions in and out of the lattice which can trigger a large change of the electronic, optical, and magnetic properties of materials and even modify the crystal structure. We present a systematic study of ionic liquid gating of exfoliated 2D molybdenum trioxide (MoO3) devices and correlate the resultant electrical properties to the electrochemical doping via ion migration during the IL biasing process. A nearly 9 orders of magnitude modulation of the MoO3 conductivity is obtained for the two types of ionic liquids that are investigated. In addition, notably rapid on/off switching was realized through a lithium-containing ionic liquid whereas much slower modulation was induced via oxygen extraction/intercalation. Time of flight-secondary ion mass spectrometry confirms the Li intercalation. Density functional theory (DFT) calculations have been carried out to examine the underlying metallization mechanism. Results of short-pulse tests show the potential of these MoO3 devices as neuromorphic computing elements due to their synaptic plasticity.
APL Materials | 2017
Anthony T. Wong; Joo Hyon Noh; Pushpa Raj Pudasaini; Ben Wolf; Nina Balke; Andreas Herklotz; Yogesh Sharma; Amanda Haglund; Sheng Dai; David Mandrus; Philip D. Rack; Thomas Ward
Ionic liquid electrolytes are gaining widespread application as a gate dielectric used to control ion transport in functional materials. This letter systematically examines the important influence that device geometry in standard “side gate” 3-terminal geometries plays in device performance of a well-known oxygen ion conductor. We show that the most influential component of device design is the ratio between the area of the gate electrode and the active channel, while the spacing between these components and their individual shapes has a negligible contribution. These findings provide much needed guidance in device design intended for ionotronic gating with ionic liquids.
Intermetallics | 2015
Amanda Haglund; Michael R. Koehler; Dhiraj Catoor; E.P. George; Veerle Keppens
Advanced Functional Materials | 2016
Pushpa Raj Pudasaini; Joo Hyon Noh; Anthony T. Wong; Olga S. Ovchinnikova; Amanda Haglund; Sheng Dai; Thomas Ward; D. Mandrus; Philip D. Rack
ECS Journal of Solid State Science and Technology | 2015
Pushpa Raj Pudasaini; Joo Hyon Noh; Anthony T. Wong; Amanda Haglund; Sheng Dai; Thomas Ward; D. Mandrus; Philip D. Rack
Advanced Functional Materials | 2016
Pushpa Raj Pudasaini; Joo Hyon Noh; Anthony T. Wong; Olga S. Ovchinnikova; Amanda Haglund; Sheng Dai; Thomas Ward; D. Mandrus; Philip D. Rack
Bulletin of the American Physical Society | 2018
Devashish Gopalan; Joe Seifert; Amanda Haglund; David Mandrus; M. Skowronski; Benjamin Hunt
Bulletin of the American Physical Society | 2018
Arthur Bowman; Kraig Andrews; Upendra Rijal; Amanda Haglund; David Mandrus; Zhixian Zhou
2D Materials | 2018
Alexander A. Puretzky; Akinola D. Oyedele; Kai Xiao; Amanda Haglund; Bobby G. Sumpter; D. Mandrus; David B. Geohegan; Liangbo Liang