Nanofabrication of two-dimensional arrays of magnetite particles for fundamental rock magnetic studies

Krasa, D., Wilkinson, C.D.W., Gadegaard, N. , Kong, X., Zhou, H., Roberts, A.P., Muxworthy, A.R. and Williams, W. (2009) Nanofabrication of two-dimensional arrays of magnetite particles for fundamental rock magnetic studies. Journal of Geophysical Research: Solid Earth, 114, B02104. (doi:10.1029/2008JB006017)

Full text not currently available from Enlighten.

Publisher's URL: http://dx.doi.org/10.1029/2008JB006017

Abstract

Magnetic measurements of samples with precisely controlled magnetic mineralogy, grain size, and interparticle spacing are needed to provide crucial experimental rock magnetic underpinning for paleomagnetic studies. We report a novel nanofabrication method for producing two-dimensional arrays of cylindrical synthetic magnetite particles with well-defined composition, particle size, and interparticle spacing. The samples are fabricated by writing dot arrays with electron beam lithography, transferring these patterns into sputtered Fe thin films by reactive ion etching in a CO/NH3 plasma, and oxidizing the resulting Fe particles in a controlled atmosphere to form magnetite. Scanning electron microscopy and transmission electron microscopy have been used to monitor the fabrication process and to determine the particle geometry. The particle sizes of our samples range between 100 nm and 265 nm with center-to-center spacings between 180 nm and 310 nm. Low-temperature magnetic remanence data confirm the stoichiometry of the magnetite. We present magnetic hysteresis data and first-order reversal curve diagrams for our samples and compare these with previously published data from other synthetic and natural magnetite samples. The ability to independently control particle size and interparticle spacing of magnetite grains makes our synthetic samples ideal for studying the influence of magnetostatic interactions on the paleomagnetic recording fidelity of naturally occurring magnetite in rocks

Item Type:Articles
Keywords:Arrays, behaviour, electron beam, electron beam lithography, electron-microscopy, etching, fabrication, FE3O4, films, hysteresis properties, lithography, low-temperature, magnetostatic interactions, microscopy, nanofabrication, nm, particle, particles, plasma, reactive ion etching, remanence, single-domain grains, size, thin-films, transmission, verwey transition
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Zhou, Dr Haiping and Wilkinson, Professor Christopher and Gadegaard, Professor Nikolaj
Authors: Krasa, D., Wilkinson, C.D.W., Gadegaard, N., Kong, X., Zhou, H., Roberts, A.P., Muxworthy, A.R., and Williams, W.
College/School:College of Science and Engineering > School of Engineering
College of Science and Engineering > School of Engineering > Biomedical Engineering
College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Journal of Geophysical Research: Solid Earth
Journal Abbr.:JGR. Solid earth
ISSN:0148-0227

University Staff: Request a correction | Enlighten Editors: Update this record

Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
405421The role of magnetostatic interactions on palaeo and environmental magnetic signals - quantification using nanoimprint lithographyChristopher WilkinsonNatural Environment Research Council (NERC)NE/C510159/1SCHOOL OF ENGINEERING