Journal
SOLID STATE NUCLEAR MAGNETIC RESONANCE
Volume 28, Issue 2-4, Pages 91-105Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ssnmr.2005.06.002
Keywords
magnetic resonance; signal-to-noise ratio; magnetic nanostructures; magnetic resonance microscopy; magnetic resonance spectroscopy; magnetic nanoparticles; magnetic susceptibility
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We introduce the concept of amplifying the transverse magnetic fields produced and/or detected with inductive coils in magnetic resonance settings by using the reversible transverse susceptibility properties of magnetic nanostructures. First, we describe the theoretical formalism of magnetic flux amplification through the coil in the presence of a large perpendicular DC magnetic field (typical of magnetic resonance systems) achieved through the singularity in the reversible transverse susceptibility in anisotropic single domain magnetic nanoparticles. We experimentally demonstrate the concept of transverse magnetic flux amplification in an inductive coil system using oriented nanoparticles with uni-axial magnetic anisotropy. We also propose a composite ferromagnetic/anti-ferromagnetic core/shell nanostructure system with uni-directional magnetic anisotropy that, in principle, provides maximal transverse magnetic flux amplification. (c) 2005 Elsevier Inc. All rights reserved.
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