Impact of short and long-range effects on the magnetic interactions in neutral organic radical-based materials

2013 ◽  
Vol 15 (18) ◽  
pp. 6982 ◽  
Author(s):  
Alex Domingo ◽  
Martin Vérot ◽  
Fernando Mota ◽  
Coen de Graaf ◽  
Juan J. Novoa ◽  
...  
Keyword(s):  
Long Range ◽  
Magnetic Interactions ◽  
Organic Radical

Finding of Bulk Ferromagnetism in Stable Organic Radical Crystal

1992 ◽  
Vol 247 ◽  
Author(s):  
Minoru Kinoshita
Keyword(s):  
Crystal Structure ◽  
Long Range ◽  
Molecular And Crystal Structure ◽  
Organic Radical ◽  
Light Elements ◽  
Nitronyl Nitroxide ◽  
Β Phase ◽  
Phase Crystal ◽  
Iupac Nomenclature ◽  
Ordered State

ABSTRACTTransition to a ferromagnetic long range ordered state was found at 0.60 K in the orthorhombic β-phase crystal of p-nitrophenyl nitronyl nitroxide (or 2-(4′-nitrophenyl)-4, 4, 5, 5-tetramethyl-4, 5-dihydro-lH-imidazol-1-oxyl-3-N-oxide in the IUPAC nomenclature). This finding provides the first example of an organic bulk ferromagnet consisting of light elements and having a definite molecular and crystal structure.

scholarly journals Distinguishing magnetic and electrostatic interactions by a Kelvin probe force microscopy–magnetic force microscopy combination

2011 ◽  
Vol 2 ◽  
pp. 552-560 ◽  
Author(s):  
Miriam Jaafar ◽  
Oscar Iglesias-Freire ◽  
Luis Serrano-Ramón ◽  
Manuel Ricardo Ibarra ◽  
Jose Maria de Teresa ◽  
...  
Keyword(s):  
Long Range ◽  
Electrostatic Interaction ◽  
Electrostatic Interactions ◽  
Magnetic Force Microscopy ◽  
Magnetic Force ◽  
Superparamagnetic Nanoparticles ◽  
Kelvin Probe Force Microscopy ◽  
Magnetic Interactions ◽  
Kelvin Probe ◽  
Force Microscopy

The most outstanding feature of scanning force microscopy (SFM) is its capability to detect various different short and long range interactions. In particular, magnetic force microscopy (MFM) is used to characterize the domain configuration in ferromagnetic materials such as thin films grown by physical techniques or ferromagnetic nanostructures. It is a usual procedure to separate the topography and the magnetic signal by scanning at a lift distance of 25–50 nm such that the long range tip–sample interactions dominate. Nowadays, MFM is becoming a valuable technique to detect weak magnetic fields arising from low dimensional complex systems such as organic nanomagnets, superparamagnetic nanoparticles, carbon-based materials, etc. In all these cases, the magnetic nanocomponents and the substrate supporting them present quite different electronic behavior, i.e., they exhibit large surface potential differences causing heterogeneous electrostatic interaction between the tip and the sample that could be interpreted as a magnetic interaction. To distinguish clearly the origin of the tip–sample forces we propose to use a combination of Kelvin probe force microscopy (KPFM) and MFM. The KPFM technique allows us to compensate in real time the electrostatic forces between the tip and the sample by minimizing the electrostatic contribution to the frequency shift signal. This is a great challenge in samples with low magnetic moment. In this work we studied an array of Co nanostructures that exhibit high electrostatic interaction with the MFM tip. Thanks to the use of the KPFM/MFM system we were able to separate the electric and magnetic interactions between the tip and the sample.

scholarly journals Long-range focusing of magnetic bound states in superconducting lanthanum

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Howon Kim ◽  
Levente Rózsa ◽  
Dominik Schreyer ◽  
Eszter Simon ◽  
Roland Wiesendanger
Keyword(s):  
Long Range ◽  
Bound States ◽  
Theoretical Calculations ◽  
Surface States ◽  
Magnetic Interactions ◽  
Magnetic Impurities ◽  
Natural Choice ◽  
Temperature Scanning ◽  
Quantum Mechanical Systems ◽  
Low Dimensional

Abstract Quantum mechanical systems with long-range interactions between quasiparticles provide a promising platform for coherent quantum information technology. Superconductors are a natural choice for solid-state based quantum devices, while magnetic impurities inside superconductors give rise to quasiparticle excitations of broken Cooper pairs that provide characteristic information about the host superconductor. Here, we reveal that magnetic impurities embedded below a superconducting La(0001) surface interact via quasiparticles extending to very large distances, up to several tens of nanometers. Using low-temperature scanning probe techniques, we observe the corresponding anisotropic and giant oscillations in the LDOS. Theoretical calculations indicate that the quasi-two-dimensional surface states with their strongly anisotropic Fermi surface play a crucial role for the focusing and long-range extension of the magnetic bound states. The quasiparticle focusing mechanism should facilitate the design of versatile magnetic structures with tunable and directed magnetic interactions over large distances, thereby paving the way toward the design of low-dimensional magnet–superconductor hybrid systems exhibiting topologically non-trivial quantum states as possible elements of quantum computation schemes based on Majorana quasiparticles.

scholarly journals Quantum Information Remote Carnot Engines and Voltage Transformers

Entropy ◽  
2019 ◽  
Vol 21 (2) ◽  
pp. 127 ◽  
Author(s):  
Jose Diazdelacruz ◽  
Miguel Martin-Delgado
Keyword(s):  
Quantum Information ◽  
Long Range ◽  
Physical System ◽  
Thermal Equilibrium ◽  
Heat Bath ◽  
Magnetic Interactions ◽  
Electrical Network ◽  
Heat Engines ◽  
Different Temperatures ◽  
Available Information

A physical system out of thermal equilibrium is a resource for obtaining useful work when a heat bath at some temperature is available. Information Heat Engines are the devices which generalize the Szilard cylinders and make use of the celebrated Maxwell demons to this end. In this paper, we consider a thermo-chemical reservoir of electrons which can be exchanged for entropy and work. Qubits are used as messengers between electron reservoirs to implement long-range voltage transformers with neither electrical nor magnetic interactions between the primary and secondary circuits. When they are at different temperatures, the transformers work according to Carnot cycles. A generalization is carried out to consider an electrical network where quantum techniques can furnish additional security.

scholarly journals Publisher's Note: Long-range magnetic interactions in the multiferroic antiferromagnet MnWO4[Phys. Rev. B83, 140401(R) (2011)]

2011 ◽  
Vol 84 (17) ◽  
Author(s):  
Feng Ye ◽  
Randy S. Fishman ◽  
Jaime A. Fernandez-Baca ◽  
Andrey A. Podlesnyak ◽  
Georg Ehlers ◽  
...  
Keyword(s):  
Long Range ◽  
Magnetic Interactions

Electric Field Dependence of Molecular Orientation and Anisotropic Magnetic Interactions in the Ferroelectric Liquid Crystalline Phase of an Organic Radical Compound by EPR Spectroscopy

2012 ◽  
Vol 82 ◽  
pp. 50-54 ◽  
Author(s):  
Katsuaki Suzuki ◽  
Yoshiaki Uchida ◽  
Rui Tamura ◽  
Yohei Noda ◽  
Naohiko Ikuma ◽  
...  
Keyword(s):  
Epr Spectroscopy ◽  
Liquid Crystalline ◽  
Interaction Constant ◽  
Magnetic Interactions ◽  
Bulk Liquid ◽  
Spin Interaction ◽  
Organic Radical ◽  
Electric Field Dependence ◽  
Weak Magnetic Fields ◽  
Average Spin

To confirm whether chiral organic radical compound 1, which showed the generation of a sort of spin glass-like inhomogeneous ferromagnetic interactions (the average spin-spin interaction constant J > 0) in the bulk liquid crystalline state under weak magnetic fields, has a spin easy axis or exhibits anisotropic magnetic interactions in the SmC* or SmC phase, we have measured the temperature dependence of g-value and relative paramagnetic susceptibility (χrel) for the ferroelectric SmC* phase of (2S,5S)-1 confined in a thin sandwich cell by EPR spectroscopy.

Effects of long-range magnetic interactions on DLA aggregation

2005 ◽  
Vol 338 (1) ◽  
pp. 1-7 ◽  
Author(s):  
Xiao-Jun Xu ◽  
Ping-Gen Cai ◽  
Quan-Lin Ye ◽  
A-Gen Xia ◽  
Gao-Xiang Ye
Keyword(s):  
Long Range ◽  
Magnetic Interactions
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