ORCID Profile
0000-0002-4725-9509
Current Organisation
University of California, San Diego
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Publisher: AIP Publishing
Date: 10-03-2015
DOI: 10.1063/1.4914340
Abstract: The objective of this study on the iconic exchange-bias bilayer Permalloy/CoO has been to identify those elements of the interfacial microstructure and accompanying magnetic properties that are responsible for the exchange-bias and hysteretic properties of this bilayer. Both epitaxial and polycrystalline s les were examined. X-ray and neutron reflectometry established that there existed an interfacial region, of width ∼1 nm, whose magnetic properties differed from those of Py or CoO. A model was developed for the interfacial microstructure that predicts all the relevant properties of this system namely the temperature and Permalloy thickness dependence of the exchange-bias, HEX, and coercivity, HC the much smaller measured values of HEX from what was nominally expected the different behavior of HEX and HC in epitaxial and polycrystalline bilayers. A surprising result is that the exchange-bias does not involve direct exchange-coupling between Permalloy and CoO, but rather is mediated by CoFe2O4 nanoparticles in the interfacial region.
Publisher: American Physical Society (APS)
Date: 28-12-2012
Publisher: AIP Publishing
Date: 06-2001
DOI: 10.1063/1.1363602
Abstract: Electron beam evaporated Co/Pt multilayers {[Co(tCo nm)/Pt(1 nm)]10, 0.2& tCo& nm} with perpendicular magnetic anisotropy and room temperature coercivities Hc=2–15 kOe are studied as a function of growth temperature TG. Hysteresis loops and magnetic force microscopy (MFM) indicate changes in the magnetization reversal mechanism along with a sharp increase in coercivity for TG≳230–250 °C. Films grown at TG& °C (tCo=0.2–0.4 nm) show micrometer size magnetic domains and rectangular hysteresis indicating magnetization reversal dominated by rapid domain wall motion following nucleation at Hn∼Hc. Films grown at TG& °C show fine-grained MFM features on the sub-100-nm length scale indicating reversal dominated by localized switching of small clusters. High-resolution cross-sectional transmission electron microscopy (TEM) with elemental analysis shows columnar grains extending throughout the multilayer stack. Co depletion and structural defects at the grain boundaries provide a mechanism for exchange decoupling of adjacent grains, which may result in the high coercivities observed.
Publisher: Springer Science and Business Media LLC
Date: 08-11-2009
DOI: 10.1038/NPHYS1436
Publisher: American Chemical Society (ACS)
Date: 29-10-2010
DOI: 10.1021/NL103301X
Abstract: Highly oriented, single-crystal Ni nanowire arrays have been synthesized atop amorphous SiO2∥Si substrates using a single-step chemical vapor deposition method in the absence of any foreign catalyst. Electron and X-ray diffraction confirm the crystalline quality of the Ni nanowires while magnetoresistance measurements probe the magnetic response and the behavior is explained using simulation results for nanoscale, single-crystal Ni. A growth mechanism involving competing chemical, energetic, and kinetic influences is presented.
Publisher: Informa UK Limited
Date: 11-06-2012
Location: United States of America
No related grants have been discovered for Eric Fullerton.