scholarly journals Accessing low-energy magnetic microstates in square artificial spin ice vertices of broken symmetry in static magnetic field

2020 ◽  
Vol 102 (22) ◽  
Author(s):  
Neeti Keswani ◽  
Ranveer Singh ◽  
Yoshikata Nakajima ◽  
Tapobrata Som ◽  
Pintu Das
Keyword(s):  
Magnetic Field ◽  
Static Magnetic Field ◽  
Low Energy ◽  
Broken Symmetry ◽  
Spin Ice ◽  
Artificial Spin Ice

scholarly journals Magnetic dipole configurations on honeycomb lattices: effect of finite size and boundaries

2012 ◽  
Vol 370 (1981) ◽  
pp. 5783-5793 ◽  
Author(s):  
Alexandra Schumann ◽  
Hartmut Zabel
Keyword(s):  
Magnetic Field ◽  
Boundary Conditions ◽  
Magnetic Dipole ◽  
Finite Size ◽  
Magnetic Monopoles ◽  
Spin Ice ◽  
Artificial Spin Ice

Artificial dipolar spin-ice patterns have attracted much attention recently because of their rich configurations and excitations in the form of Dirac strings connecting magnetic monopoles. We have analysed the distribution of excitations in the form of strings and vertices carrying magnetic charges Q =±3 q in honeycomb artificial spin-ice patterns. Two types of patterns are compared, those that terminate with open hexagons and those with closed hexagons. The dipole configurations and the frequency of spin-ice rule-violating Q =±3 q vertices depend slightly on the boundary conditions of the pattern. Upon rotation of the patterns by 2 π in a coercive magnetic field of 500 Oe, complete reversibility of the charge and string configuration is observed.

The Effects of Static Magnetic Field in Leaching Cadmium and Arsenic by Acidthiobacillus ferrooxidans

2014 ◽  
Vol 675-677 ◽  
pp. 90-93
Author(s):  
Li Li Lu ◽  
Dong Wei Li ◽  
Xiang Dong Wei ◽  
Chan Juan Liao ◽  
Jiao Lian Jiang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Static Magnetic Field ◽  
Magnetic Induction ◽  
Mining Area ◽  
Low Energy ◽  
Leaching Rate ◽  
Environmental Friendly ◽  
Metal Recycling ◽  
Low Energy Consumption ◽  
Magnetic Induction Intensity

In view of the pollution of heavy metals in tailings of mining area, considering some metal recycling, in this paper, the method which was environmental friendly, mild reaction, short process, low energy consumption was applied to leaching As and Cd in tailings. Before leaching, Static Magnetic Field was used to deal with leach liquor, to research the effect of leaching rate for As and Cd. The results showed that under the conditions of pulp density 5%, inoculum 10%, leaching temperature 30°C, pH 2.0, magnetic induction intensity separately were 2mT , 5mT , 8mT and 11mT, the leaching rates of As and Cd were increased respectively about 8% and 2%. Besides, magnetic induction intensity also effected. The best magnetic induction intensity in bioleaching of As and Cd were respectively 2mT and 8mT.

scholarly journals Controlled creation and annihilation of isolated robust emergent magnetic monopole like charged vertices in square artificial spin ice

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Neeti Keswani ◽  
Ricardo J. C. Lopes ◽  
Yoshikata Nakajima ◽  
Ranveer Singh ◽  
Neha Chauhan ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Monopole ◽  
Magnetic Charge ◽  
Direct Visualization ◽  
South Pole ◽  
Spin Ice ◽  
Opposite Charge ◽  
Artificial Spin Ice ◽  
Thermally Driven ◽  
Classical Analogue

AbstractMagnetic analogue of an isolated free electric charge, i.e., a magnet with a single north or south pole, is a long sought-after particle which remains elusive so far. In magnetically frustrated pyrochlore solids, a classical analogue of monopole was observed as a result of excitation of spin ice vertices. Direct visualization of such excitations were proposed and later confirmed in analogous artificial spin ice (ASI) systems of square as well as Kagome geometries. However, such magnetically charged vertices are randomly created as they are thermally driven and are always associated with corresponding equal and opposite emergent charges, often termed as monopole–antimonopole pairs, connected by observable strings. Here, we demonstrate a controlled stabilisation of a robust isolated emergent monopole-like magnetically charged vertices in individual square ASI systems by application of an external magnetic field. The excitation conserves the magnetic charge without the involvement of a corresponding excitation of opposite charge. Well supported by Monte Carlo simulations our experimental results enable, in absence of a true elemental magnetic monopole, creation of electron vortices and studying electrodynamics in presence of a monopole-like field in a solid state environment.

Transfer optics for high spatial resolution electron spectroscopy

1988 ◽  
Vol 46 ◽  
pp. 666-667
Author(s):  
G. G. Hembree ◽  
Luo Chuan Hong ◽  
P.A. Bennett ◽  
J.A. Venables
Keyword(s):  
Magnetic Field ◽  
Scanning Transmission Electron Microscope ◽  
Low Energy ◽  
Objective Lens ◽  
State University ◽  
Arizona State University ◽  
Initial Field ◽  
Resolution Electron ◽  
Scanning Transmission ◽  
Low Energy Electrons

A new field emission scanning transmission electron microscope has been constructed for the NSF HREM facility at Arizona State University. The microscope is to be used for studies of surfaces, and incorporates several surface-related features, including provision for analysis of secondary and Auger electrons; these electrons are collected through the objective lens from either side of the sample, using the parallelizing action of the magnetic field. This collimates all the low energy electrons, which spiral in the high magnetic field. Given an initial field Bi∼1T, and a final (parallelizing) field Bf∼0.01T, all electrons emerge into a cone of semi-angle θf≤6°. The main practical problem in the way of using this well collimated beam of low energy (0-2keV) electrons is that it is travelling along the path of the (100keV) probing electron beam. To collect and analyze them, they must be deflected off the beam path with minimal effect on the probe position.

Decreased chemotaxis of human peripheral phagocytes exposed to a strong static magnetic field

2004 ◽  
Vol 91 (1) ◽  
pp. 59-65 ◽  
Author(s):  
S Sipka ◽  
I Szöllősi ◽  
Gy Batta ◽  
Gy Szegedi ◽  
Á Illés ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Static Magnetic Field

Intense Static Magnetic Field Induced Bone Growth in Vivo

1984 ◽  
Vol 3 (1) ◽  
pp. 223-234
Author(s):  
Frank Papatheofanis ◽  
Bill Fapatheofanls ◽  
Robert Ray
Keyword(s):  
Magnetic Field ◽  
Static Magnetic Field ◽  
Bone Growth

ABOUT UNIFORMITY OF THE PHENOMENOLOGY AND THE MATHEMATICAL DESCRIPTION OF SO-CALLED « JOINED» ACTION OF HAZARDS AND COMBINED TOXICITY (ON THE EXAMPLE OF A COMBIBATION OF THE FLUORIDE AND THE STATIC MAGNETIC FIELD)

2016 ◽  
pp. 13-20
Author(s):  
B. A. Katsnelson ◽  
M. P. Sutunkova ◽  
N. A. Tsepilov ◽  
V. G. Panov ◽  
A. N. Varaksin ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Static Magnetic Field ◽  
Point Of View ◽  
Whole Body ◽  
Surface Model ◽  
Combined Toxicity ◽  
Fluoride Solution ◽  
Adverse Action ◽  
Biochemical Indices ◽  
And Control

Sodium fluoride solution was injected i.p. to three groups of rats at a dose equivalent to 0.1 LD50 three times a week up to 18 injections. Two out of these groups and two out of three groups were sham-injected with normal saline and were exposed to the whole body impact of a 25 mT static magnetic field (SMF) for 2 or 4 hr a day, 5 times a week. Following the exposure, various functional and biochemical indices were evaluated along with histological examination and morphometric measurements of the femur in the differently exposed and control rats. The mathematical analysis of the combined effects of the SMF and fluoride based on the a response surface model demonstrated that, in full correspondence with what we had previously found for the combined toxicity of different chemicals, the combined adverse action of a chemical plus a physical agent was characterized by a tipological diversity depending not only on particular effects these types were assessed for but on the dose and effect levels as well. From this point of view, the indices for which at least one statistically significant effect was observed could be classified as identifying (I) mainly single-factor action; (II) additive unidirectional action; (III) synergism (superadditive unidirectional action); (IV) antagonism, including both subadditive unidirectional action and all variants of contradirectional action.

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