Results 51 to 60 of about 11,871 (158)

Giant Spin-Orbit Interaction Due to Rotating Magnetic Fields in Graphene Nanoribbons

Physical Review X, 2013
We study graphene nanoribbons theoretically in the presence of spatially varying magnetic fields produced, e.g., by nanomagnets. We show, both analytically and numerically, that an exceptionally large Rashba spin-orbit interaction of the order of 10 meV ...
Jelena Klinovaja, Daniel Loss
doaj   +1 more source

1.5-dimensional simulation of free electron maser amplifiers

Physical Review Special Topics. Accelerators and Beams, 2005
A 1.5-dimensional model of Compton/Raman free-electron laser (FEL) amplifiers with helical wigglers has been composed by using the helical-trajectory approach.
A. V. Elzhov, A. K. Kaminsky, E. A. Perelstein, S. N. Sedykh, A. P. Sergeev   +4 more
doaj   +1 more source

A new type of resonant magnetic perturbation for controlling edge localized modes

Nuclear Fusion
A new type of resonant magnetic perturbation (RMP), generated by helical coils, is proposed for controlling the edge localized mode (ELM) in H-mode tokamak plasmas. The helical coil optimization utilizes the MARS-F code (Liu et al 2000 Phys.
Xu Yang, Yueqiang Liu, Xuan Sun, Wei Xu, Li Li, Yuling He, Guoliang Xia, Hanqing Hu, Lina Zhou   +8 more
doaj   +1 more source

Rotation of a Solar Jet Driven by Plasma Flow along Helical Magnetic Fields in an Active Region

The Astrophysical Journal
Solar jets, collimated plasma ejections driven by magnetic reconnection, play a vital role in energy transport and coronal heating. While rotational motions in jets are often attributed to magnetic field untwisting, alternative explanatory mechanisms ...
Lei Huang, Yang Guo, Zhen Li, Jinhan Guo, Mingde Ding   +4 more
doaj   +1 more source

Compartmentalized Microhelices Prepared via Electrohydrodynamic Cojetting

Advanced Science, 2018
Anisotropically compartmentalized microparticles have attracted increasing interest in areas ranging from sensing, drug delivery, and catalysis to microactuators.
Manjae Gil, Seongjun Moon, Jaewon Yoon, Sahar Rhamani, Jae‐Won Shin, Kyung Jin Lee, Joerg Lahann   +6 more
doaj   +1 more source

A Rotation Measure Gradient on the M87 VLA Jet

EPJ Web of Conferences, 2013
Rotation measures (RMs) have proven to be an excellent tool to study magnetic field structures in AGNs. Here we study RM properties on kiloparsec scales of theM87 jet via stacked multi wavelength polarized VLA observations. Our results show for the first
Algaba Juan Carlos, Asada Keiichi, Nakamura Masanori   +2 more
doaj   +1 more source

Evidence for Toroidal B-Field Components in AGN Jets on Kiloparsec Scales

Galaxies, 2017
Though helical magnetic fields are generally believed to arise when the jets of Active Galactic Nuclei (AGN) are launched, it is still unclear what role they play (and if they survive) to the largest jet scales.
Sebastian Knuettel, Denise Gabuzda, Shane P. O’Sullivan   +2 more
doaj   +1 more source

Spin fluctuation driven magnetoresistance, domain Re-distribution and anomalous Hall effect in helical antiferromagnetic Eu metal thin films

AIP Advances
Europium (Eu) metal has a body centered cubic crystal structure which, upon a paramagnetic-to-helical magnetic phase transition, undergoes a body centered tetragonal distortion.
Narendra Shrestha, Jinke Tang
doaj   +1 more source

Direct numerical simulations of helical dynamo action: MHD and beyond [PDF]

Nonlinear Processes in Geophysics, 2004
Magnetohydrodynamic dynamo action is often invoked to explain the existence of magnetic fields in several astronomical objects. In this work, we present direct numerical simulations of MHD helical dynamos, to study the exponential growth and saturation ...
D. O. Gómez, D. O. Gómez, P. D. Mininni   +2 more
doaj  

The structure of helical interplanetary magnetic fields

Geophysical Research Letters, 1991
The interplanetary magnetic field is known to be highly helical. Although the detailed spatial structure of the fields has yet to be elucidated, the helicity spectrum has been conjectured to result from a random walk in direction of a constant magnitude magnetic field vector.
Goldstein, Melvyn, Roberts, D. A., Fitch, C. A.   +2 more
openaire   +1 more source