Publications de Arash Alahgholipour Omrani

Superparamagnetic Nanoparticles as High Efficiency Magnetic Resonance Imaging T-2 Contrast Agent

Kurt Schenk, Henrik Moodysson Rønnow, Arash Alahgholipour Omrani, Francesco Stellacci, Randy Patrick Carney, Paulo Henrique Jacob Silva, Tamara Michael Carney, Ping Huang, Lin Yang

Nanoparticle-based magnetic resonance imaging T-2 negative agents are of great interest, and much effort is devoted to increasing cell loading capability while maintaining low cytotoxicity. Herein, two classes of mixed-ligand protected magnetic-responsive, ...

American Chemical Society2017

Intrachain antiferromagnetic exchange in a 1D branched-chain built of two different copper(II) centres interlinked by end-on azido and phenoxo bridges: electron density map, electrochemical and magnetic properties

Kurt Schenk, Philip Pattison, Krunoslav Prsa, Henrik Moodysson Rønnow, Arash Alahgholipour Omrani, Noore Elahi Shaik

A 1D, end-on azido- and phenoxo-bridged, coordination polymer, Cu-2(mu-NAPPR)(mu(1,1)-N-3)(2) (1), (NAPPR(2-) = 1,3-bis(naphthylideneimino) propane dianion), was synthesized and characterized. The 1D branched-chain is built of two types of slightly di ...

2015

Exploration of the helimagnetic and skyrmion lattice phase diagram in Cu2OSeO3 using magnetoelectric susceptibility

Helmuth Berger, Arnaud Magrez, Krunoslav Prsa, Henrik Moodysson Rønnow, Ivica Zivkovic, Arash Alahgholipour Omrani, Jonathan White

Using superconducting quantum interference device magnetometry techniques, we have studied the change in magnetization versus applied ac electric field, i.e. the magnetoelectric (ME) susceptibility dM/dE, in the chiral-lattice ME insulator Cu2OSeO3. Measur ...

Amer Physical Soc2014

Electric-Field-Induced Skyrmion Distortion and Giant Lattice Rotation in the Magnetoelectric Insulator Cu2OSeO3

Helmuth Berger, Arnaud Magrez, Krunoslav Prsa, Henrik Moodysson Rønnow, Ivica Zivkovic, Arash Alahgholipour Omrani, Jonathan White, Ping Huang

Uniquely in Cu2OSeO3, the Skyrmions, which are topologically protected magnetic spin vortexlike objects, display a magnetoelectric coupling and can be manipulated by externally applied electric (E) fields. Here, we explore the E-field coupling to the magne ...

American Physical Society2014

Nanofabricated Devices based on Intrinsically Layered Correlated Electron Materials

Arash Alahgholipour Omrani

EPFL2013

Possible spin-orbit driven spin-liquid ground state in the double perovskite phase of Ba3YIr2O9

Henrik Moodysson Rønnow, Arash Alahgholipour Omrani

We report the structural transformation of hexagonal Ba3YIr2O9 to a cubic double perovskite form (stable in ambient conditions) under an applied pressure of 8 GPa at 1273 K. While the ambient pressure synthesized sample undergoes long-range magnetic orderi ...

Amer Physical Soc2013

Micro-fabrication process for small transport devices of layered manganite

Andras Kis, Aleksandra Radenovic, Henrik Moodysson Rønnow, Arash Alahgholipour Omrani

Devices have been fabricated based on the bilayer manganite La1.4Sr1.6Mn2O7, which in the bulk state orders magnetically below 90 K, at which point both in-plane and c-axis bulk resistivity decrease by 2-3 orders of magnitude. We provide an optimized proce ...

American Institute of Physics2012