Wernsdorfer, W., Stamatatos, T. C., Christou, G.
Magnetization measurements of a Mn12mda wheel single-molecule magnet with a spin ground state of S = 7 show resonant tunneling and quantum phase interference, which are established by studying the...
Bahr, S., Milios, C. J., Jones, L. F., Brechin, E. K., Mosser, V., Wernsdorfer, W.
We present magnetization measurements on the single molecule magnet Mn6, revealing various tunnel transitions inconsistent with a giant-spin description. We propose a dimeric model of the molecule...
Kondo effects in a C_60 single-molecule transistor (2008)
Roch, N., Winkelmann, C. B., Florens, S., Bouchiat, V., Wernsdorfer, W., Balestro, F.
We have used the electromigration technique to fabricate a $\rm{C_{{60}}}$ single-molecule transistor (SMT). We present a full experimental study as a function of temperature, down to 35 mK, and as a...
Neutron spectroscopy and magnetic relaxation of the Mn$_6$ nanomagnets (2008)
Carretta, S., Guidi, T., Santini, P., Amoretti, G., Pieper, O., Lake, B., ...
Inelastic neutron scattering has been used to determine the microscopic Hamiltonian describing two high-spin variants of the high-anisotropy Mn$_6$ nanomagnet. The energy spectrum of both systems is...
Ramsey et al. [Nature Phys. 4, 277-281 (2008)] report the observation of quantum interference associated with tunnelling trajectories between states of different total spin length in a dimeric...
Jönsson, P. E., Mathieu, R., Wernsdorfer, W., Tkachuk, A. M., Barbara, B.
We show in this comment that the claim by Ancona-Torres et al. of an equilibrium quantum or classical phase transition in the LiHo$_x$Y$_{1-x}$F$_4$ system is not supported by a reliable analysis,...
Energy Level Lifetimes in the Single-Molecule Magnet Fe_8 : Experiments and Simulations (2007)
Bahr, S., Petukhov, K., Mosser, V., Wernsdorfer, W.
We present pump-probe measurements on the single-molecule magnet Fe_8 with microwave pulses having a length of several nanoseconds. The microwave radiation in the experiments is located in the...
Bahr, S., Petukhov, K., Mosser, V., Wernsdorfer, W.
We present magnetization measurements on the single molecule magnet Fe8 in the presence of pulsed microwave radiation. A pump-probe technique is used with two microwave pulses with frequencies of 107...
Gate-tuned high frequency response of carbon nanotube Josephson junctions (2007)
Wernsdorfer, W., Andergassen, S., Florens, S., Bouchiat, V., Ondarcuhu, Th., ...
Carbon nanotube (CNT) Josephson junctions in the open quantum dot limit exhibit superconducting switching currents which can be controlled with a gate electrode. Shapiro voltage steps can be observed...
Absence of Conventional Spin-Glass Transition in the Ising Dipolar System LiHo_xY_{1-x}F_4 (2007)
Jönsson, P. E., Mathieu, R., Wernsdorfer, W., Tkachuk, A. M., Barbara, B.
The magnetic properties of single crystals of LiHo_xY_{1-x}F_4 with x=16.5% and x=4.5% were recorded down to 35 mK using a micro-SQUID magnetometer. While this system is considered as the archetypal...
Electron paramagnetic resonance detected via magnetization measurements (2007)
Presented are magnetization measurements on a crystal of Fe8 single-molecule magnets using a Hall probe magnetometer. Irradiation with microwaves at frequencies of 92 and 110-120 GHz leads to the...
Magnetization dynamics in the single-molecule magnet Fe8 under pulsed microwave irradiation (2007)
Petukhov, K., Bahr, S., Wernsdorfer, W., Mosser, V.
We present measurements on the single molecule magnet Fe8 in the presence of pulsed microwave radiation at 118 GHz. The spin dynamics is studied via time resolved magnetization experiments using a...
Chen, L., Ramsey, C. M., Dalal, N. S., Ren, T., Cotton, F. A., Wernsdorfer, W., ...
The ruthenium based molecular magnet [Ru$_2$(D(3,5-Cl$_2$Ph)F)$_4$Cl(0.5H$_2$O)$\cdotp$C$_6$H$_{14}$] (hereafter Ru$_2$) behaves as a two-level system at sufficiently low temperatures. The authors...
Photon-assisted tunneling in a Fe8 Single-Molecule Magnet (2006)
Sorace, L., Wernsdorfer, W., Thirion, C., Pacchioni, M., Mailly, D., ...
The low temperature spin dynamics of a Fe8 Single-Molecule Magnet was studied under circularly polarized electromagnetic radiation allowing us to establish clearly photon-assisted tunneling. This...
Wernsdorfer, W., Bouchiat, V., Ondarcuhu, Th., Monthioux, M.
We recently presented the first superconducting quantum interference device (SQUID) with single-walled carbon nanotube (CNT) Josephson junctions [1: J. P. Cleuziou, W. Wernsdorfer, V. Bouchiat, T....
Faucher, M., Fournier, T., Pannetier, B., Thirion, C., Wernsdorfer, W., Villegier, J. C., ...
We present a fabrication method of superconducting quantum interference devices (SQUIDs) based on direct write lithography with an Atomic Force Microscope (AFM). This technique involves maskless...
Bouchiat, V., Faucher, M., Thirion, C., Wernsdorfer, W., Fournier, T., Pannetier, B.
We present a method for fabricating Josephson junctions and superconducting quantum interference devices (SQUIDs) which is based on the local anodization of niobium strip lines 3 to 6.5 nm-thick...
Tiron, R., Wernsdorfer, W., Foguet-Albiol, D., Aliaga-Alcalde, N., Christou, G.
A new family of supramolecular, antiferromagnetically exchange-coupled dimers of single-molecule magnets (SMMs) has recently been reported [W. Wernsdorfer, N. Aliaga-Alcalde, D.N. Hendrickson, and G....
Quantum tunneling in a three dimensional network of exchange coupled single-molecule magnets (2006)
Tiron, R., Wernsdorfer, W., Aliaga-Alcalde, N., Hendrickson, D. N., Christou, G.
A Mn4 single-molecule magnet (SMM) is used to show that quantum tunneling of magnetization (QTM) is not suppressed by moderate three dimensional exchange coupling between molecules. Instead, it leads...
Switching of magnetization by non-linear resonance studied in single nanoparticles (2006)
Thirion, C., Wernsdorfer, W., Mailly, D.
Magnetization reversal in magnetic particles is one of the fundamental issues in magnetic data storage. Technological improvements require the understanding of dynamical magnetization reversal...
Thirion, C., Wernsdorfer, W., Jamet, M., Dupuis, V., Melinon, P., Perez, A., ...
An improved micro-SQUID technique is presented allowing us to measure the temperature dependence of the magnetisation switching fields of single nanoparticles well above the critical superconducting...
Accorsi, S., Barra, A. L., Caneschi, A., Chastanet, G., Cornia, A., Fabretti, A. C., ...
Tetrairon(III) Single-Molecule Magnets (SMMs) with a propeller-like structure exhibit tuneable magnetic anisotropy barriers in both height and shape. The clusters [Fe-4(L-1)(2)(dpm)(6)] (1),...
Nanometer-sized magnetic particles have generated continuous interest as the study of their properties has proved to be scientifically and technologically very challenging. In this article we...
Lecren, L., Roubeau, O., Coulon, C., Li, Yang-Guang, Goff, X. Le, Wernsdorfer, W., ...
Four discrete MnIII/MnII tetra-nuclear complexes with double-cuboidal core were synthesized. dc magnetic measurements show that both Mn2+ - Mn3+ and Mn3+ - Mn3+ magnetic interactions are...
Quantum phase interference and spin parity in Mn12 single-molecule magnets (2005)
Wernsdorfer, W., Chakov, N. E., Christou, G.
Magnetization measurements of Mn12 molecular nanomagnets with spin ground states of S = 10 and S = 19/2 showresonance tunneling at avoided energy level crossings. The observed oscillations of the...
Determination of the magnetic anisotropy axes of single-molecule magnets (2005)
Wernsdorfer, W., Chakov, N. E., Christou, G.
Simple methods are presented allowing the determination of the magnetic anisotropy axes of a crystal of a single-molecule magnet (SMM). These methods are used to determine an upper bound of the easy...
In a recent paper, cond-mat/0405331 (Ref. 1), del Barco et al. reported experimental studies on a Ni4 molecular system. They used an experimental method (combining microwave spectroscopy with high...
Comment on 'Pulsed field studies of the magnetization reversal in molecular nanomagnets' (2005)
Wernsdorfer, W., Chakov, N. E., Christou, G.
In a recent paper, cond-mat/0404041, J. Vanacken et al. reported experimental studies of crystals of Mn12-ac molecular nanomagnets in pulsed magnetic fields with sweep rates up to 4000 T/s. Steps in...
Resonant photon absorption in the low spin molecule V15 (2005)
Wernsdorfer, W., Mueller, A., Mailly, D., Barbara, B.
We report the first study of the micro-SQUID response of a molecular system to electromagnetic radiation. The advantages of our micro-SQUID technique in respect to pulsed electron paramagnetic...
Wernsdorfer, W., Soler, M., Hendrickson, D. N., Christou, G.
A Mn30 molecular cluster is established to be the largest single-molecule magnet (SMM) discovered to date. Magnetization versus field measurements show coercive fields of about 0.5 T at low...
Quantum dynamics of exchange biased Single Molecule Magnets (2005)
Wernsdorfer, W., Aliaga-Alcalde, N., Tiron, R., Hendrickson, D. N., Christou, G.
We present a new family of exchange biased Single Molecule Magnets in which antiferromagnetic coupling between the two components results in quantum behaviour different from that of the individual...
Two-body tunnel transitions in a Mn4 Single-Molecule Magnet (2005)
Wernsdorfer, W., Bhaduri, S., Tiron, R., Hendrickson, D. N., Christou, G.
The one-body tunnel picture of single-molecule magnets (SMMs) is not always sufficient to explain the measured tunnel transitions. An improvement to the picture is proposed by including also two-body...
Spin-spin cross-relaxation in single-molecule magnets (2005)
Wernsdorfer, W., Bhaduri, S., Tiron, R., Hendrickson, D. N., Christou, G.
It is shown that dipolar and weak superexchange interactions between the spin systems of single-molecule magnets (SMM) play an important role in the relaxation of magnetization. These interactions...
Spin-parity dependent tunneling of magnetization in single-molecule magnets (2005)
Wernsdorfer, W., Bhaduri, S., Boskovic, C., Christou, G., Hendrickson, D. N.
Single-molecule magnets facilitate the study of quantum tunneling of magnetization at the mesoscopic level. The spin-parity effect is among the fundamental predictions that have yet to be clearly...
Quantum phase interference (Berry phase) in single-molecule magnets of Mn12 (2005)
Wernsdorfer, W., Soler, M., Christou, G., Hendrickson, D. N.
Magnetization measurements of a molecular clusters Mn12 with a spin ground state of S = 10 show resonance tunneling at avoided energy level crossings. The observed oscillations of the tunnel...
Wernsdorfer, W., Thirion, C., Demoncy, N., Pascard, H., Mailly, D.
The combination of high sensitive superconducting quantum interference device (SQUID) with high quality nanoparticles allowed to check the simplest classical model describing the magnetisation...
Wernsdorfer, W., Paulsen, C., Sessoli, R.
Answer to the comment of E. Chudnovsky concerning the following papers: (1) N.V. Prokof\'ev, P.C.E. Stamp, Phys. Rev. Lett.80, 5794 (1998). (2) W. Wernsdorfer, T. Ohm, C. Sangregorio, R. Sessoli, D....
Nonadiabatic Landau Zener tunneling in Fe_8 molecular nanomagnets (2005)
Wernsdorfer, W., Sessoli, R., Caneschi, A., Gatteschi, D., Cornia, A.
The Landau Zener method allows to measure very small tunnel splittings \\Delta in molecular clusters Fe_8. The observed oscillations of \\Delta as a function of the magnetic field applied along the...
Wernsdorfer, W., Caneschi, A., Sessoli, R., Gatteschi, D., Cornia, A., Villar, V., ...
The strong influence of nuclear spins on resonant quantum tunneling in the molecular cluster Fe_8 is demonstrated for the first time by comparing the relaxation rate of the standard Fe_8 sample with...
Quantum nucleation in a single-chain magnet (2005)
Wernsdorfer, W., Clerac, R., Coulon, C., Lecren, L., Miyasaka, H.
The field sweep rate (v=dH/dt) and temperature (T) dependence of the magnetization reversal of a single-chain magnet (SCM) is studied at low temperatures. As expected for a thermally activated...
Wernsdorfer, W., Murugesu, M., Tasiopoulos, A. J., Christou, G.
A method, based on the Neel-Brown model of thermally activated magnetization reversal of a magnetic single-domain particle, is proposed to study the field sweep rate dependence of the coercive field...
Wernsdorfer, W., Bhaduri, S., Vinslava, A., Christou, G.
A Mn4 single-molecule magnet (SMM), with a well isolated spin ground state of S = 9/2, is used as a model system to study Landau-Zener (LZ) tunneling in the presence of weak intermolecular dipolar...
Wernsdorfer, W., Murugesu, M., Christou, G.
Magnetization measurements of a truly axial symmetry Mn12-tBuAc molecular nanomagnet with a spin ground state of S = 10 show resonance tunneling. This compound has the same magnetic anisotropy as...
Ishikawa, N., Sugita, M., Wernsdorfer, W.
The first measurements of magnetization hysteresis loops on diluted single crystal of [(Pc)2Ho]-TBA+ (Pc: phthalocyaninato, TBA: tetrabutylammonium) in the subkelvin temperature range are reported....
Ishikawa, N., Sugita, M., Wernsdorfer, W.
Magnetization versus field measurements were performed on single crystals of [(Pc)2TbIII0.02YIII0.98]^TBA+ and [(Pc)2DyIII0.02YIII0.98]^TBA+ (Pc: phthalocyaninato, TBA: tetrabutylammonium) at 0.04 K....
Resonant photon absorption and hole burning in Cr7Ni antiferromagnetic rings (2005)
Wernsdorfer, W., Mailly, D., Timco, G. A., Winpenny, R. E. P.
Presented are magnetization measurements on a crystal of Cr7Ni antiferromagnetic rings. Irradiation with microwaves at frequencies between 1 and 10 GHz leads to observation of very narrow resonant...
Quantum phase interference and spin parity in Mn12 single-molecule magnets (2005)
Wernsdorfer, W., Chakov, N. E., Christou, G.
Magnetization measurements of Mn12 molecular nanomagnets with spin ground states of S = 10 and S = 19/2 showresonance tunneling at avoided energy level crossings. The observed oscillations of the...
Electron paramagnetic resonance detected via magnetization measurements (2005)
Presented are magnetization measurements on a crystal of Fe8 single-molecule magnets using a Hall probe magnetometer. Irradiation with microwaves at frequencies of 92 and 110-120 GHz leads to the...
Studies of an enneanuclear manganese single-molecule (2005)
Piligkos, S, Rajaraman, G, Soler, M, Kirchner, N, Van Slageren, J, Bircher, R, ...
Quantum phase interference and spin parity in Mn12 single-molecule magnets (2005)
Wernsdorfer, W., Chakov, N. E., Christou, G.
Magnetization measurements of Mn12 molecular nanomagnets with spin ground states of S = 10 and S = 19/2 showresonance tunneling at avoided energy level crossings. The observed oscillations of the...
Quantum phase interference and spin parity in Mn12 single-molecule magnets (2005)
Wernsdorfer, W., Chakov, N. E., Christou, G.
Magnetization measurements of Mn12 molecular nanomagnets with spin ground states of S = 10 and S = 19/2 showresonance tunneling at avoided energy level crossings. The observed oscillations of the...
Studies of an Enneanuclear Manganese Single-Molecule Magnet (2005)
Piligkos, S., Rajaraman, G., Soler, M., Kirchner, N., Van Slageren, J., Bircher, R., ...
Switching of magnetization by non-linear resonance studied in single nanoparticles (2004)
Thirion, C., Wernsdorfer, W., Mailly, D.
Magnetization reversal in magnetic particles is one of the fundamental issues in magnetic data storage. Technological improvements require the understanding of dynamical magnetization reversal...
Fruchart, O., Toussaint, J. C., Jubert, P. O., Wernsdorfer, W., Hertel, R., Mailly, D., ...
We have measured the in-plane angular variation of nucleation and annihilation fields of a multi-domain magnetic single dot with a microsquid. The dots are Fe/Mo(110) self-assembled in UHV, with...
Determination of the magnetic anisotropy axes of single-molecule magnets (2004)
Wernsdorfer, W., Chakov, N. E., Christou, G.
Simple methods are presented allowing the determination of the magnetic anisotropy axes of a crystal of a single-molecule magnet (SMM). These methods are used to determine an upper bound of the easy...
In a recent paper, cond-mat/0405331 (Ref. 1), del Barco et al. reported experimental studies on a Ni4 molecular system. They used an experimental method (combining microwave spectroscopy with high...
Comment on 'Pulsed field studies of the magnetization reversal in molecular nanomagnets' (2004)
Wernsdorfer, W., Chakov, N. E., Christou, G.
In a recent paper, cond-mat/0404041, J. Vanacken et al. reported experimental studies of crystals of Mn12-ac molecular nanomagnets in pulsed magnetic fields with sweep rates up to 4000 T/s. Steps in...
Glauber dynamics in a single-chain magnet: From theory to real systems (2004)
Coulon, C., Clerac, R., Lecren, L., Wernsdorfer, W., Miyasaka, H.
The Glauber dynamics is studied in a single-chain magnet. As predicted, a single relaxation mode of the magnetization is found. Above 2.7 K, the thermally activated relaxation time is mainly governed...
Giant Single-Molecule Magnets: A Mn84 Torus and its Supramolecular Nanotubes (2004)
Tasiopoulos, A. J., Vinslava, A., Wernsdorfer, W., Abboud, K. A., Christou, G.
The discovery a decade ago that individual molecules can function as magnetizable magnets provided a new, 'bottom-up' approach to nanoscale magnetic materials, and such molecules have since been...
Resonant photon absorption in the low spin molecule V15 (2004)
Wernsdorfer, W., Mueller, A., Mailly, D., Barbara, B.
We report the first study of the micro-SQUID response of a molecular system to electromagnetic radiation. The advantages of our micro-SQUID technique in respect to pulsed electron paramagnetic...
Determination of the magnetic anisotropy axes of single-molecule magnets (2004)
Wernsdorfer, W., Chakov, N. E., Christou, G.
Simple methods are presented allowing the determination of the magnetic anisotropy axes of a crystal of a single-molecule magnet (SMM). These methods are used to determine an upper bound of the easy...
In a recent paper, cond-mat/0405331 (Ref. 1), del Barco et al. reported experimental studies on a Ni4 molecular system. They used an experimental method (combining microwave spectroscopy with high...
Comment on 'Pulsed field studies of the magnetization reversal in molecular nanomagnets' (2004)
Wernsdorfer, W., Chakov, N. E., Christou, G.
In a recent paper, cond-mat/0404041, J. Vanacken et al. reported experimental studies of crystals of Mn12-ac molecular nanomagnets in pulsed magnetic fields with sweep rates up to 4000 T/s. Steps in...
Resonant photon absorption in the low spin molecule V15 (2004)
Wernsdorfer, W., Mueller, A., Mailly, D., Barbara, B.
We report the first study of the micro-SQUID response of a molecular system to electromagnetic radiation. The advantages of our micro-SQUID technique in respect to pulsed electron paramagnetic...
Switching of magnetization by non-linear resonance studied in single nanoparticles (2004)
Thirion, C., Wernsdorfer, W., Mailly, D.
Magnetization reversal in magnetic particles is one of the fundamental issues in magnetic data storage. Technological improvements require the understanding of dynamical magnetization reversal...
Switching of magnetization by non-linear resonance studied in single nanoparticles (2004)
Thirion, C., Wernsdorfer, W., Mailly, D.
Magnetization reversal in magnetic particles is one of the fundamental issues in magnetic data storage. Technological improvements require the understanding of dynamical magnetization reversal...
Determination of the magnetic anisotropy axes of single-molecule magnets (2004)
Wernsdorfer, W., Chakov, N. E., Christou, G.
Simple methods are presented allowing the determination of the magnetic anisotropy axes of a crystal of a single-molecule magnet (SMM). These methods are used to determine an upper bound of the easy...
In a recent paper, cond-mat/0405331 (Ref. 1), del Barco et al. reported experimental studies on a Ni4 molecular system. They used an experimental method (combining microwave spectroscopy with high...
Comment on 'Pulsed field studies of the magnetization reversal in molecular nanomagnets' (2004)
Wernsdorfer, W., Chakov, N. E., Christou, G.
In a recent paper, cond-mat/0404041, J. Vanacken et al. reported experimental studies of crystals of Mn12-ac molecular nanomagnets in pulsed magnetic fields with sweep rates up to 4000 T/s. Steps in...
Resonant photon absorption in the low spin molecule V15 (2004)
Wernsdorfer, W., Mueller, A., Mailly, D., Barbara, B.
We report the first study of the micro-SQUID response of a molecular system to electromagnetic radiation. The advantages of our micro-SQUID technique in respect to pulsed electron paramagnetic...