D. Stamopoulos

Radiolabeled Iron Oxide Nanoparticles As Dual-Modality SPECT/MRI and PET/MRI Agents

Dual-modality contrast agents, such as radiolabeled nanoparticles, are promising candidates for a number of diagnostic applications, since they combine the advantages of two different imaging modalities, namely SPECT or PET imaging with MR imaging. The benefit of such a combination is to more accurately interpret disease and abnormalities in vivo, by exploiting the advantages of each imaging technique, i.e. high sensitivity for SPECT/PET, high resolution anatomical information for MRI. In this review article, we provide an overview of recent findings in the synthesis, evaluation and application of radiolabeled iron oxide nanoparticles as dual-modality SPECT/MRI and PET/MRI imaging probes.

Stray-fields-based magnetoresistance mechanism in Ni 80 Fe 20 − Nb − Ni 80 Fe 20 trilayered hybrids

We report on the transport and magnetic properties of hybrid trilayers and bilayers that consist of low spin-polarized Ni80Fe20 exhibiting in-plane but no uniaxial anisotropy and low-Tc Nb. We reveal a magnetoresistance effect that is pronounced. In our trilayers the magnetoresistance exhibits an increase of two orders of magnitude when the superconducting state is reached: from the conventional normal-state values 0.6 % it goes up to 1000 % for temperatures below Tc. In contrast, in the bilayers the effect is only minor since from 3% in the normal state increases only to 70 % for temperatures below Tc. Magnetization data of both the longitudinal and transverse magnetic components are presented. Most importantly, we present data not only for the normal state of Nb but also in its superconducting state. Strikingly, these data show that below its Tc SC the Nb interlayer under the influence of the outer Ni80Fe20 layers attains a magnetization component transverse to the external field. By comparing the transport and magnetization data we propose a candidate mechanism that could motivate the pronounced magnetoresistance effect observed in the trilayers. Adequate magnetostatic coupling of the outer Ni80Fe20 layers is motivated by stray fields that emerge naturally in their whole surface due to the multidomain magnetic structure that they attain near coercivity. Atomic force microscopy is employed in order to examine the possibility that such magnetostatic coupling could be promoted by interface roughness. Referring to the bilayers, although out-of-plane rotation of the magnetization of the single Ni80Fe20 layer is still observed, in these structures magnetostatic coupling does not occur due to the absence of a second Ni80Fe20 one so that the observed magnetoresistance peaks are only modest.

Crystal and magnetic structure of the La 1 − x Ca x MnO 3 compound ( 0.11 ⩽ x ⩽ 0.175 )

We studied the crystal and magnetic structure of the

Modulation of the properties of thin ferromagnetic films with an externally applied electric field in ferromagnetic/piezoelectric/ferromagnetic hybrids

{\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3}

Enhancement of superconductivity by exchange bias

compound for

Ferromagnetic-superconducting hybrid films and their possible applications: A direct study in a model combinatorial film

(0.11\ensuremath{\leqslant}x\ensuremath{\leqslant}0.175)

Effective ferromagnetic coupling between a superconductor and a ferromagnet in La Ca Mn O ∕ Nb hybrids

using stoichiometric samples. For

The nucleation of superconductivity in superconducting-ferromagnetic hybrid films

xl0.13

Co/Nb/Co trilayers as efficient cryogenic spin valves and supercurrent switches: the relevance to the standard giant and tunnel magnetoresistance effects

the systems ground state is insulating canted antiferromagnetic. For

Nanobiotechnology for the Prevention of Dialysis-related Amyloidosis

0.13\ensuremath{\leqslant}x\ensuremath{\leqslant}0.175