Results 111 to 120 of about 8,222,423 (238)

Dark Heritage Prospection ‐ Mapping the Treblinka II Extermination Camp Using a Magnetometer Survey and Integrated Archival Sources

Archaeological Prospection, EarlyView.
ABSTRACT The history of Nazi German extermination camps has, until recently, relied primarily on eyewitness testimony. Very few official documents detailing the facilities survived the war due to the special operation ‘Sonderaktion 1005’, dedicated to hiding their existence and extent.
Sebastian Różycki, Michał Pisz, Paweł Bylina, James Walker, Lucy Benoit   +4 more
wiley   +1 more source

All-optical stochastic switching of magnetisation textures in Fe3Sn2

Communications Materials
The all-optical control of magnetisation at room temperature broadens the scope of applications of spin degrees-of-freedom in data storage, spintronics, and quantum computing.
András Kovács, Jonathan T. Weber, Michalis Charilaou, Deli Kong, Lilian Prodan, Vladimir Tsurkan, Alexander Schröder, Nikolai S. Kiselev, István Kézsmárki, Rafal E. Dunin-Borkowski, Amir H. Tavabi, Sascha Schäfer   +11 more
doaj   +1 more source

Interplay of Bridge Topology and Conformation in Phenylene‐Bridged Trityl Diradicals

Chemistry – A European Journal, EarlyView.
We present a meta‐phenylene‐bridged trityl diradical that exhibits an unexpectedly weak antiferromagnetic exchange coupling J with a strong environment‐dependent magnitude. Combined VSM, EPR, DFT, and MD studies reveal that structural flexibility modulates σ‐, π‐, and through‐space exchange contributions, highlighting the crucial role of geometry in ...
Kevin Lars Kopp, Tobias Hett, Andrea Pellegrini, Stefan Grimme, Olav Schiemann   +4 more
wiley   +1 more source

A Cyclic {NiII8DyIII4} Cluster Where the DyIII Moments Are Organized by the Transition Metal Spins

Chemistry – A European Journal, EarlyView.
The synthesis, structural characterisation, and magnetic properties of a cyclic Ni8Dy4 coordination cluster are reported. Ab initio CASSCF and DFT calculations help rationalize the shape of the microSQUID hysteresis and the competing magnetic interactions within the compound. ABSTRACT A series of [Ni8Ln4(CO3)4(L)8(NO3)2(H2O)8 (MeOH)4](NO3)2 (Ln = Dy (1)
Imon J. Dutta, Kartik Chandra Mondal, Jonas Braun, Wolfgang Wernsdorfer, Christopher E. Anson, Yanhua Lan, Kuduva R. Vignesh, Annie K. Powell   +7 more
wiley   +1 more source

Vibrational Circular Dichroism Spectra of 2,5‐Diaminoterephtalate Macrocycles Reveal Distant Vibrational Exciton Coupling

Chemistry – A European Journal, EarlyView.
The energy level diagrams for the ν(C═O) and the δ(N─H) vibrations, resulting of combining in‐phase and out‐of‐phase modes on the basis of their local symmetries, was built by applying the exciton coupling theory to a new class of chiral macrocycles, based on the 2,5‐diaminoterephthalate scaffold.
Samara Medina, Krzysztof Nowak, Marek Grzybowski, Juan Casado, Francisco J. Ramírez   +4 more
wiley   +1 more source

Multi-wavelength emission modelling of PSR J0437–4715

Astronomy & Astrophysics
Context. The diversity of pulsar light curves and radio polarisation properties originates in the structure of the magnetic field close to the stellar surface. For millisecond pulsars, this complexity is particularly puzzling.
Pétri J., Stammler P., Guillemot L., Guillot S., González-Caniulef D., Jankowski F., Webb N.   +6 more
doaj   +1 more source

Readily Accessible bTurea‐Derived Nitroxide Polarizing Agents for Dynamic Nuclear Polarization: bcTCOOKs and bcTmols

Chemistry – A European Journal, EarlyView.
Two families of bTurea‐derived biradicals, bcTmols and bcTCOOKs, were prepared as polarizing agents for dynamic nuclear polarization (DNP)‐enhanced NMR through short and efficient synthetic routes. The best‐performing biradical, bcTCOOK‐M2, containing two methyl groups on the urea bridge, provided signal enhancements of up to ∼220 at 14.1 T and 100 K ...
Ancy T. Wilson, Shubha S. Gunaga, Frederic Mentink‐Vigier, Snorri Th. Sigurdsson   +3 more
wiley   +1 more source

Multi-observatory Study of Young Stellar Energetic Flares (MORYSEF): No Evidence for Abnormally Strong Stellar Magnetic Fields after Powerful X-Ray Flares

The Astrophysical Journal
We explore the empirical power-law relationship between X-ray luminosity ( L _X ) and total surface magnetic flux (Φ), established across solar magnetic elements, time- and disk-averaged emission from the Sun, older active stars, and pre-main-sequence ...
Konstantin V. Getman, Oleg Kochukhov, Joe P. Ninan, Eric D. Feigelson, Vladimir S. Airapetian, Abygail R. Waggoner, L. Ilsedore Cleeves, Jan Forbrich, Sergio A. Dzib, Charles J. Law, Christian Rab, Daniel M. Krolikowski   +11 more
doaj   +1 more source

Structure–Activity Relationships in Methyl‐Driven Overhauser Effect DNP

Chemistry – A European Journal, EarlyView.
Dynamic nuclear polarization (DNP) was investigated in a wide array of methyl‐containing Blatter radicals to identify design principles for the synthesis of an Overhauser DNP polarizing agent. Fourteen different radicals were synthesized, which revealed that only radicals possessing sterically unhindered methyl groups in sites of high spin density were
Ananya Mukherji, Emma A. Foley, Shubha S. Gunaga, Thierry Dubroca, Mukaila A. Ibrahim, Jin‐Seok Yi, Nisreen Sharara, Syed Raza, Fadwat Bazzi, Simona Marincean, Dragos F. Flesariu, Panayiotis A. Koutentis, Frédéric Mentink‐Vigier, Takeshi Kobayashi, Christos P. Constantinides, Frédéric A. Perras   +15 more
wiley   +1 more source

Fe–Ca‐Catalyzed Conversion of Cellulose Into Highly Ordered Graphitic Carbon Revealed by Solid‐State 13C NMR and Mössbauer Spectroscopy

Chemistry – A European Journal, EarlyView.
New insights into the mechanism of the structural transformation of cellulose into highly ordered graphitic carbon using an Fe–Ca bimetallic catalyst were obtained through complementary spectroscopic techniques, including Raman, solid‐state NMR, and Mössbauer.
Shamala Gowri Krishnan, Yannick Coppel, Jean‐François Meunier, Ange Nzihou   +3 more
wiley   +1 more source