From Magnetic Nanoparticles to Magnetoresistive Biosensors

• Authors: I. Ennen , C. Albon , A. Weddemann , A. Auge , P. Hedwig , F. Wittbracht , A. Regtmeier , D. Akemeier , A. Dreyer , M. Peter , P. Jutzi , J. Mattay , N. Mitzel , N. Mill , A. Hütten
• Languages of publication: EN

Abstracts

EN

This paper highlights recent advances in synthesis and magnetotransport properties of magnetic Co nanoparticles. It is shown that magnetic Co nanoparticles self-assembled in nanoparticular monolayers revealing giant magnetoresistance similar to granular systems but with additional features resulting from dipolar interactions between small domains of nanoparticles. A spin-valve with one magnetic Co nanoparticular electrode is employed as a model to demonstrate that individual magnetic moments of Co nanoparticles can be coupled to a magnetic Co layer which in turn offers tailoring of the resulting giant magnetoresistance characteristics. In addition, it is demonstrated that combining a magnetic on-off ratchet with magnetic tunneling junctions integrated in the ratchet introduces a new biosensor concept enabling: (1) simultaneous transporting and separating biomolecules, (2) dynamical biomolecule detection when passing magnetic tunneling junctions in a 1D arrangement. It is projected that this biosensor concept could be applied for viruses as well as for bacteria.

Keywords

EN

85.70.-w; 85.75.-d; 75.75.Fk; 64.75.Yz; 87.85.fk

Discipline

• 85.70.-w: Magnetic devices(for magnets, see 07.55.Db; for molecular magnets, see 75.50.Xx; for beam bending magnets, see 41.85.Lc; see also 84.71.Ba Superconducting magnets and magnetic levitation devices; 75.50.Ss Magnetic recording materials)
• 75.75.Fk: Domain structures in nanoparticles
• 87.85.fk: Biosensors
• 85.75.-d: Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields
• 64.75.Yz: Self-assembly

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2012
• Volume: 121
• Issue: 2
• Pages: 420-425

Dates

published

2012-02

Contributors

author

I. Ennen

• Institute of Solid State Physics, Vienna University of Technology, A-1040 Vienna, Austria

author

C. Albon

• Department of Physics, Thin Films and Physics of Nanostructures, Bielefeld University, 33615 Bielefeld, Germany

author

A. Weddemann

• Massachusetts Institute of Technology, RLE, LEES, 77 Massachusetts Ave, 02139 Cambridge, MA, USA

author

A. Auge

• Department of Physics, Thin Films and Physics of Nanostructures, Bielefeld University, 33615 Bielefeld, Germany

author

P. Hedwig

• Department of Physics, Thin Films and Physics of Nanostructures, Bielefeld University, 33615 Bielefeld, Germany

author

F. Wittbracht

• Department of Physics, Thin Films and Physics of Nanostructures, Bielefeld University, 33615 Bielefeld, Germany

author

A. Regtmeier

• Department of Physics, Thin Films and Physics of Nanostructures, Bielefeld University, 33615 Bielefeld, Germany

author

D. Akemeier

• Department of Physics, Thin Films and Physics of Nanostructures, Bielefeld University, 33615 Bielefeld, Germany

author

A. Dreyer

• Department of Chemistry, Organometallic Chemistry, Bielefeld University, 33615 Bielefeld, Germany

author

M. Peter

• Department of Chemistry, Organic Chemistry I, Bielefeld University, 33615 Bielefeld, Germany

author

P. Jutzi

• Department of Chemistry, Organometallic Chemistry, Bielefeld University, 33615 Bielefeld, Germany

author

J. Mattay

• Department of Chemistry, Organic Chemistry I, Bielefeld University, 33615 Bielefeld, Germany

author

N. Mitzel

• Department of Chemistry, Inorganic and Structural Chemistry, Bielefeld University, 33615 Bielefeld, Germany

author

N. Mill

• Department of Physics, Thin Films and Physics of Nanostructures, Bielefeld University, 33615 Bielefeld, Germany

author

A. Hütten

• Department of Physics, Thin Films and Physics of Nanostructures, Bielefeld University, 33615 Bielefeld, Germany

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Identifiers

DOI

10.12693/APhysPolA.121.420