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Bálint Náfrádi

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Publications associées (80)

Frustration-induced one-dimensionality in the isosceles triangular antiferromagnetic lattice of delta-(EDT-TTF-CONMe2)(2)AsF6

László Forró, Bálint Náfrádi

The 1/4-filled organic compound, delta-(EDT-TTF-CONMe2)(2)AsF6 is a frustrated two-dimensional triangular magnetic system as shown by high-frequency (111.2 and 222.4 GHz) electron spin resonance (ESR) and structural data in the literature. The material gra ...

Amer Physical Soc2016

Rapid thickness reading of CH3NH3PbI3 nanowire thin films from color maps

László Forró, Claudio Grimaldi, Bálint Náfrádi, Massimo Spina, Endre Horvath

Hybrid halide perovskite photovoltaic materials show a remarkable light conversion efficiency in various optoelectronic devices. In the fabrication of these solar cells, light emitting diodes, laser and photodetector prototypes the thickness of the perovsk ...

Wiley-VCH Verlag2016

Anisotropic transport properties of tungsten disulfide

Helmuth Berger, László Forró, Richard Gaal, Bálint Náfrádi, Jacim Jacimovic, Andrea Pisoni

Single crystals of WS2 were prepared by chemical vapor transport method using sulfur as a transport agent. Measurements of electrical resistivity, Seebeck coefficient and thermal conductivity as a function of temperature, along the in-plane and the out-of- ...

Pergamon-Elsevier Science Ltd2016

Magnetic-photoconductive material, magneto-optical data storage device, magneto-optical data storage system, and light-tunable microwave components comprising a photoconductive-ferromagnetic device

László Forró, Bálint Náfrádi, Endre Horvath

The present invention concerns a magnetic-photoconductive material including orientable magnetic moments or spins, the material being configured to generate photo-carriers permitting to orientate or re-orientate the magnetic moments or spins at a material ...

2016

Dinuclear clathrochelate complexes with pendent cyano groups as metalloligands

Kay Severin, Rosario Scopelliti, Euro Solari, Bálint Náfrádi, Philip Pattison, Henrik Moodysson Rønnow, Ivica Zivkovic, Mathieu Jérémie Marmier, Giacomo Cecot, José Luis Bila

Dinuclear clathrochelate complexes with two, three, four, or five cyano groups in the ligand periphery were prepared following two distinct synthetic strategies: (a) zinc(II)- or cobalt(II)-templated polycondensation reactions of CN-functionalized arylboro ...

2016

Optically switched magnetism in photovoltaic perovskite CH3NH3(Mn:Pb)I-3

László Forró, Oleg Yazyev, Alla Arakcheeva, Bálint Náfrádi, Massimo Spina, Endre Horvath, Péter Szirmai

The demand for ever-increasing density of information storage and speed of manipulation boosts an intense search for new magnetic materials and novel ways of controlling the magnetic bit. Here, we report the synthesis of a ferromagnetic photovoltaic CH3NH3 ...

Nature Publishing Group2016

Room temperature manipulation of long lifetime spins in metallic-like carbon nanospheres

László Forró, Bálint Náfrádi

The time-window for processing electron spin information (spintronics) in solid-state quantum electronic devices is determined by the spin-lattice and spin-spin relaxation times of electrons. Minimizing the effects of spin-orbit coupling and the local magn ...

Nature Publishing Group2016

Two-dimensional Magnetism in kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]Cl, a Spin-1/2 Heisenberg Antiferromagnet with Dzyaloshinskii-Moriya Interaction

László Forró, Bálint Náfrádi, Agnes Antal

The finite phase transition temperature, T-N, of quasi two-dimensional (2D) Heisenberg antiferromagnetic (AF) crystals results from in-plane anisotropy or coupling between layers. It is usually not known which is the determining factor when both are weak. ...

Physical Soc Japan2015

Methylammonium Lead Iodide for Efficient X-ray Energy Conversion

László Forró, Bálint Náfrádi, Endre Horvath

We report on photocurrent generation by X-ray irradiation in methylammonium lead iodide CH3NH3PbI3 single crystals. We observed 75% of charge collection efficiency in millimeter sized samples. This efficiency is partially due to the high photon absorption ...

American Chemical Society2015

Tuning of the Thermoelectric Figure of Merit of CH3NH3MI3 (M=Pb,Sn) Photovoltaic Perovskites

László Forró, Davor Pavuna, Bálint Náfrádi, Massimo Spina, Endre Horvath, Xavier François Mettan, Andrea Pisoni, Péter Krisztián Matus, Riccardo Pisoni

The hybrid halide perovskites, the very performant compounds in photovoltaic applications, possess large Seebeck coefficient and low thermal conductivity, making them potentially interesting high figure of merit (ZT) materials. For this purpose, one needs ...

American Chemical Society2015

Microengineered CH3NH3PbI3 Nanowire/Graphene Phototransistor for Low-Intensity Light Detection at Room Temperature

László Forró, Richard Gaal, Arnaud Magrez, Bálint Náfrádi, Massimo Spina, Endre Horvath, Laurent Syavoch Bernard, Mario Joe Lehmann, Eric Joseph Bonvin

The first hybrid phototransistors are reported where the performance of a network of photoactive CH3NH3PbI3 nanowires is enhanced by CVD-grown monolayer graphene. These devices show responsivities as high as ≈2.6 × 106 A W- ...

2015

The Role of Transport Agents in MoS2 Single Crystals

Helmuth Berger, László Forró, Arnaud Magrez, Bálint Náfrádi, Arnaud Walter, Jacim Jacimovic, Andrea Pisoni

We report resistivity, thermoelectric power, and thermal conductivity of MoS2 single crystals prepared by the chemical vapor transport (CVT) method using I-2, Br-2, and TeCl4 as transport agents. The material presents low-lying donor and acceptor levels, w ...

Amer Chemical Soc2015

Strong Interplay between the Electron Spin Lifetime in Chemically Synthesized Graphene Multilayers and Surface-Bound Oxygen

László Forró, Bálint Náfrádi

The electron spin lifetime in an assembly of chemically synthesized graphene sheets was found to be extremely sensitive to oxygen. Introducing small concentrations of physisorbed O-2 onto the graphene surface reduced the exceptionally long 140 ns electron ...

Wiley-V C H Verlag Gmbh2015

Spin lifetime of itinerant electrons in chemically synthesized graphene multi-layers

László Forró, Bálint Náfrádi

A chemically synthesized graphitic material where the structural coherence between the layers is missing approximates very well the assembly of graphene sheets. Our multi-frequency (9.4-420 GHz) electron spin resonance (ESR) study clearly identifies itiner ...

Pergamon-Elsevier Science Ltd2014

Evolution of two-dimensional antiferromagnetism with temperature and magnetic field in multiferroic Ba2CoGe2O7

Bálint Náfrádi

We report on spherical neutron polarimetry and unpolarized neutron diffraction in zero magnetic field as well as flipping ratio and static magnetization measurements in high magnetic fields on the multiferroic square lattice antiferromagnet Ba2CoGe2O7. We ...

Amer Physical Soc2014

Electron spin lifetime in chemically synthesized graphene sheets

László Forró, Bálint Náfrádi

Graphene is theoretically expected to be a highly suitable material for spintronic and quantum computation applications. Current experimental reports assign surprisingly low spin lifetimes to graphene and related carbon structures. Recently, we showed a so ...

Wiley-V C H Verlag Gmbh2014

Synthesis of Homogeneous Manganese-Doped Titanium Oxide Nanotubes from Titanate Precursors

László Forró, Kurt Schenk, Arnaud Magrez, Bálint Náfrádi, Zlatko Mickovic, Rita Smajda, Endre Horvath, Péter Szirmai

We report a novel synthesis route of homogeneously manganese-doped TiO2 nanotubes in a broad concentration range. The scroll-type trititanate (H2Ti3O7) nanotubes prepared by hydrothermal synthesis were used as precursors. Mn2+ ions were introduced by an io ...

Amer Chemical Soc2013

Observation of conduction electron spin resonance in boron-doped diamond

László Forró, Bálint Náfrádi, Péter Szirmai, Ferenc Simon

We observe the electron spin resonance of conduction electrons in boron-doped (6400 ppm) superconducting diamond (T-c = 3.8 K). We clearly identify the benchmarks of conduction electron spin resonance (CESR): the nearly temperature independent electron spi ...

Amer Physical Soc2013

From nanotubes to single crystals: Co doped TiO2

Helmuth Berger, László Forró, Richard Gaal, Arnaud Magrez, Bálint Náfrádi, Neda Nikseresht Ghanepour, Jacim Jacimovic, Endre Horvath

Millimeter-sized cobalt doped rutile crystals with a bi-pyramidal shape are obtained by chemical vapour transport using scroll-type H2Ti3O7 nanotubes as a precursor in which Co2+ ions are introduced by a simple ion exchange method prior to the growth. Desp ...

Amer Inst Physics2013

Molecular and Spin Dynamics in the Paramagnetic Endohedral Fullerene Gd3N@C-80

László Forró, Bálint Náfrádi, Agnes Antal

Gd3N@C-80 endohedral fullerene, a starting material for a potential magnetic resonance imaging contrast agent, is investigated by high-frequency electron spin resonance (ESR) and SQUID magnetometry. The magnetic moments of the three Gd ions of the endohedr ...

Amer Chemical Soc2012

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