Abstract/Details

Nanoscale magnetoelectronic devices via electron beam patterning of diblock copolymer films


2003 2003

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Abstract (summary)

A new technique for fabricating magnetic nanowire transport devices is developed by exposing an ordered and microphase separated P(S-b-MMA) diblock copolymer film with an electron beam. The volume fraction of the PS (polystyrene) block of the diblock copolymer is chosen to be 0.7 to get cylindrical microphase separation, where the PMMA (polymethyl methacrylate) cylinders are aligned perpendicular to the substrate by an external electric field. Electron beam exposure of the aligned diblock copolymer crosslinks the PS matrix and degrades the PMMA inside the cylindrical regions, creating a laterally patterned hexagonal array of nanopores (12 run in diameter with a lattice spacing of 24 nm). A unique magnetotransport device is fabricated, consisting of an array of electrodeposited Co nanowires standing atop a thin gold film patterned into a four-probe resistor configuration. Magnetoresistance measurements are performed at various temperatures and magnetic field orientations. This technique is further extended to a multi-level lithographic processing which allowed to fabricate and study the magnetotransport properties through a few vertical Co nanowires in electrical contact. Magnetization reversal of Co nanowires is studied via anisotropic magnetoresistance (AMR) measurements.

Indexing (details)


Subject
Condensation
Classification
0611: Condensation
Identifier / keyword
Pure sciences; Diblock copolymer; Electron beam patterning; Magnetoelectronic; Nanoscale
Title
Nanoscale magnetoelectronic devices via electron beam patterning of diblock copolymer films
Author
Bal, Mustafa
Number of pages
227
Publication year
2003
Degree date
2003
School code
0118
Source
DAI-B 64/01, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
0493996826, 9780493996820
Advisor
Tuominen, Mark. T.
University/institution
University of Massachusetts Amherst
University location
United States -- Massachusetts
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3078668
ProQuest document ID
305321117
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/305321117
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