Research on Error Diffusion in Bit Patterned Media

Thermal Fluctuation ◽

Error Diffusion ◽

Magnetization Direction ◽

Bit Patterned Media ◽

Patterned Media ◽

The Magnetic Field ◽

Field Intensity Distribution

The presence on any variation in the magnetization direction of an island has a detrimental effect on the ability to recover recorded data.To approve this,Ansys Finite Element Method software has been used to simulate the magnetic field intensity distribution in bit patterned media,from the result, It is seen the magnetization direction variations because of thermal fluctuation can cause errors,But this errors can not diffusion, It is isolated.

Magnetotaxis as a Means for Nanofabrication

International Journal of High Speed Electronics and Systems ◽

10.1142/s0129156414500086 ◽

2014 ◽

Vol 23 (01n02) ◽

pp. 1450008

Author(s):

Isaac Macwan ◽

Zihe Zhao ◽

Omar Sobh ◽

Jinnque Rho ◽

Ausif Mahmood ◽

...

Keyword(s):

Magnetic Field ◽

Geomagnetic Field ◽

Semiconductor Manufacturing ◽

Magnetotactic Bacteria ◽

Semiconductor Substrate ◽

Field Lines ◽

A Chain ◽

Magnetospirillum Magneticum ◽

Magnetotactic bacteria (MTB), discovered in early 1970s contain single-domain crystals of magnetite ( Fe 3 O 4) called magnetosomes that tend to form a chain like structure from the proximal to the distal pole along the long axis of the cell. The ability of these bacteria to sense the magnetic field for displacement, also called magnetotaxis, arises from the magnetic dipole moment of this chain of magnetosomes. In aquatic habitats, these organisms sense the geomagnetic field and traverse the oxic-anoxic interface for optimal oxygen concentration along the field lines. Here we report an elegant use of MTB where magnetotaxis of Magnetospirillum magneticum (classified as AMB-1) could be utilized for controlled navigation over a semiconductor substrate for selective deposition. We examined 50mm long coils made out of 18AWG and 20AWG copper conductors having diameters of 5mm, 10mm and 20mm for magnetic field intensity and heat generation. Based on the COMSOL simulations and experimental data, it is recognized that a compound semiconductor manufacturing technology involving bacterial carriers and carbon-based materials such as graphene and carbon nanotubes would be a desirable choice in the future.

The magnetic field about a three-dimensional block neodymium magnet

ANZIAM Journal ◽

10.21914/anziamj.v62.14220 ◽

2021 ◽

Vol 62 ◽

pp. 386-405

Author(s):

Graham John Weir ◽

George Chisholm ◽

Jerome Leveneur

Keyword(s):

Magnetic Field ◽

Permanent Magnets ◽

Hard Disk Drives ◽

Three Dimensional ◽

Transverse Magnetic ◽

Observation Point ◽

Magnetization Direction ◽

Potential Approach ◽

Neodymium Magnet ◽

Neodymium magnets were independently discovered in 1984 by General Motors and Sumitomo. Today, they are the strongest type of permanent magnets commercially available. They are the most widely used industrial magnets with many applications, including in hard disk drives, cordless tools and magnetic fasteners. We use a vector potential approach, rather than the more usual magnetic potential approach, to derive the three-dimensional (3D) magnetic field for a neodymium magnet, assuming an idealized block geometry and uniform magnetization. For each field or observation point, the 3D solution involves 24 nondimensional quantities, arising from the eight vertex positions of the magnet and the three components of the magnetic field. The only unknown in the model is the value of magnetization, with all other model quantities defined in terms of field position and magnet location. The longitudinal magnetic field component in the direction of magnetization is bounded everywhere, but discontinuous across the magnet faces parallel to the magnetization direction. The transverse magnetic fields are logarithmically unbounded on approaching a vertex of the magnet. doi:10.1017/S1446181120000097

Tunable amplified spontaneous emission based on liquid magnetically responsive photonic crystals

Journal of Materials Chemistry C ◽

10.1039/c8tc05763j ◽

2019 ◽

Vol 7 (13) ◽

pp. 3740-3743 ◽

Cited By ~ 1

Author(s):

Ying Li ◽

Yue Long ◽

Guoqiang Yang ◽

Chen-Ho Tung ◽

Kai Song

Keyword(s):

Magnetic Field ◽

Photonic Crystals ◽

Spontaneous Emission ◽

Field Intensity ◽

Amplified Spontaneous Emission ◽

The wavelength of amplified spontaneous emission based on liquid magnetically responsive photonic crystals can be tuned by simply changing the magnetic field intensity.

A Novel Method for Improving Low-Temperature Flotation Performance of Nonpolar Oil in the Molybdenite Flotation

Minerals ◽

10.3390/min9100609 ◽

2019 ◽

Vol 9 (10) ◽

pp. 609 ◽

Cited By ~ 1

Author(s):

Wan ◽

Qu ◽

Li ◽

He ◽

Bu ◽

...

Keyword(s):

Magnetic Field ◽

Surface Tension ◽

Low Temperature ◽

Interfacial Tension ◽

Field Intensity ◽

Maximum Surface ◽

Flotation Recovery ◽

Flotation Performance ◽

Nonpolar hydrocarbon oil (NHO) is one of the most extensively used collectors in the flotation of molybdenite due to its excellent selectivity. However, NHO has low sensibility at pulp temperature. At low temperatures (<283 K), although more kerosene is used, the recovery of molybdenite flotation is still lower than at room temperature. In this study, magnetizing treatment, which is an efficient, low-cost, innovative, and environmentally friendly emulsification method, was used to improve the flotation performance of NHO in low-temperature molybdenite flotation. The test results showed that, compared with unmagnetized kerosene (UMK), the optimum dosage of magnetized kerosene (MK) could be reduced by 11% at 298 K. At the same dosage of kerosene, the flotation recovery of MK was 3% higher than UMK at 278 K. The surface tension measurement results showed that the surface tension of MK rose periodically as the magnetic field intensity increased, and there was a maximum surface tension within each period. Further, the magnetic field intensity had the maximum flotation recovery of molybdenite at the maximum surface tension of MK. Combined with the analysis based on the Girifalco–Good theory and the static drop volume method of interfacial tension, the interfacial tension of kerosene–water was shown to decrease with the increase of the surface tension of kerosene. This finding indicates that the dispersibility of kerosene in pulp could be improved by reducing the size of oil droplets, thereby improving the molybdenite flotation recovery of kerosene at low-temperature pulp. It is helpful to improve the flotation recovery of molybdenite using NHO as a collector for low-temperature pulp (<283 K).

Optical Birefringence Growth Driven by Magnetic Field in Liquids: The Case of Dibutyl Phosphate/Propylamine System

Applied Sciences ◽

10.3390/app10010164 ◽

2019 ◽

Vol 10 (1) ◽

pp. 164 ◽

Cited By ~ 4

Author(s):

Mikolaj Pochylski ◽

Domenico Lombardo ◽

Pietro Calandra

Keyword(s):

Magnetic Field ◽

Self Assembly ◽

Magnetic Energy ◽

Molar Ratio ◽

Molecular Liquids ◽

Microscopic Scale ◽

Intensity Response ◽

Soft Particles ◽

Magnetically-induced birefringence is usually low in molecular liquids owing to the low magnetic energy of molecules with respect to the thermal one. Despite this, it has been found that a mixture of dibutyl phosphate and propylamine at propylamine molar ratio (X) around 0.33 surprisingly gives an intense effect (∆n/λ ≈ −0.1 at 1 Tesla). In this paper the time- and intensity- response to the magnetic field of such mixture have been studied. It was found that the reaction to the magnetic field is unusually slow (from several minutes to hours) depending of the magnetic field intensity. On the basis of the data, the model of orientable dipoles dispersed in a matrix enables to interpret the magnetic field-induced self-assembly in terms of soft molecules-based nanostructures. The analogy with systems made of magnetically polarizable (solid or soft) particles dispersed in liquid carrier allows understanding, at the microscopic scale, the molecular origin and the supra-molecular dynamics involved in the observed behavior. The data present a novel phenomenon in liquid phase where the progressive building up/change of ordered and strongly interacting amphiphiles is driven by the magnetic field.

AN ELECTROMAGNETIC INTERPRETATION PROBLEM IN GEOPHYSICS

Geophysics ◽

10.1190/1.1437686 ◽

1951 ◽

Vol 16 (3) ◽

pp. 431-449 ◽

Cited By ~ 5

Author(s):

L. B. Slichter

Keyword(s):

Magnetic Field ◽

Electrical Properties ◽

Vertical Component ◽

Single Frequency ◽

Magnetic Intensity ◽

Conductivity Function ◽

The Magnetic Field ◽

Surface Observations ◽

Interpretation Problem

An interpretation problem in electromagnetic prospecting is discussed. A flat earth in which the three electrical properties of material vary only with depth is subjected to an alternating inducing field produced by a dipole above the surface with axis perpendicular to the surface. Observations of the horizontal or of the vertical component of the magnetic intensity at the ground’s surface are supposed to be available at all distances. From these observations solutions for the three unknown functions are developed. When the magnetic permeability is variable, the solutions for the permeability and dielectric functions require observations at two different frequencies. The conductivity function may be found from observations at a single frequency. It is shown that the horizontal and vertical components of the magnetic field intensity are mutually dependent in the region above the ground’s surface; and formulae independent of the ground’s characteristics are deduced for expressing [Formula: see text] in terms of [Formula: see text], and vice‐versa. Here [Formula: see text] denotes a plane coincident with or above and parallel to, the earth’s surface.

Viscosity of Potassium Dihydrogen Phosphate Aqueous Solution within Magnetic Field

Materials Science Forum ◽

10.4028/www.scientific.net/msf.898.1783 ◽

2017 ◽

Vol 898 ◽

pp. 1783-1786

Author(s):

Lei Zhang ◽

Yi Su ◽

Yu Lin Wu ◽

Yao Liu ◽

Yong Wang ◽

...

Keyword(s):

Magnetic Field ◽

Aqueous Solution ◽

Field Intensity ◽

Extreme Values ◽

Potassium Dihydrogen Phosphate ◽

Experimental Results ◽

Dihydrogen Phosphate ◽

Potassium Dihydrogen ◽

The viscosity of potassium dihydrogen phosphate, KH2PO4 (KDP), aqueous solution within magnetic field was studied. Experimental results showed that, the viscosity of saturated KDP solution exhibited multiple extreme values when the magnetic field intensity increased from 0 Gs to 2250 Gs. Influences of the magnetic field intensity on the viscosity of KDP solution were very complicated. It’s concerned with the temperature and the concentration of solution. As the KDP was produced from aqueous solution within magnetic field, the temperature and the concentration of solution also needed to be carefully controlled. Magnetic field with intensity values of 300 Gs, 600 Gs and 1800 Gs, all have the strong effects on the structures of KDP aqueous solution.

Microstructure and Properties under Alternating Magnetism after Hot Rolling

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1004-1005.1256 ◽

2014 ◽

Vol 1004-1005 ◽

pp. 1256-1259

Author(s):

Shen Bai Zheng ◽

Shi Jie Liu ◽

Hong Bin Li ◽

Bin Feng ◽

Xue Song Hui

Keyword(s):

Magnetic Field ◽

Carbon Steel ◽

Cold Rolling ◽

Grain Growth ◽

Hot Rolling ◽

Raw Materials ◽

Low Carbon Steel ◽

Low Carbon ◽

The austenite steel after rolling was radiated by the alternating magnetism, and the effects that alternating magnetic on the austenite transition was studied. The result shows that the alternating magnetism promotes the austenitic grain growth of low carbon steel. If the magnetic field intensity is increased, it could provide better performance of raw materials to cold rolling processing.

The role of the magnetic field intensity and geometry in the type III burst generation

Solar Physics ◽

10.1007/bf00156777 ◽

1990 ◽

Vol 130 (1-2) ◽

pp. 31-37 ◽

Cited By ~ 6

Author(s):

P. Zlobec ◽

V. Ruždjak ◽

B. Vršnak ◽

M. Karlický ◽

M. Messerotti

Keyword(s):

Magnetic Field ◽

Field Intensity ◽

Type Iii ◽

Improved the Performance of Focusing Deep Hyperthermia Inductive Heating for Breast Cancer Treatment by Using Ferro-Fluid with Magnetic Shielding System

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.325-326.353 ◽

2013 ◽

Vol 325-326 ◽

pp. 353-358 ◽

Cited By ~ 1

Author(s):

Thosdeekoraphat Thanaset ◽

Santalunai Samran ◽

Thongsopa Chanchai

Keyword(s):

Magnetic Field ◽

Field Intensity ◽

Magnetic Fluid ◽

Magnetic Shielding ◽

Inductive Heating ◽

Surrounding Healthy Tissue ◽

The Magnetic Field ◽

Shielding System ◽

Deep Hyperthermia

The performance improved of focusing deep hyperthermia inductive heating for breast cancer treatment using magnetic fluid nanoparticles with magnetic shielding system has been presented in the paper and the results are discussed. It is a technique challenge in hyperthermia therapy is to control locally heat the tumor region up to an appropriate temperature to destroy cancerous cells, without damaging the surrounding healthy tissue by using magnetic fluid nanoparticles and cylindrical metal shielding with aperture. We show that the magnetic field intensity can be controlled by changing the aperture size to suitable. In addition, the position of the heating can be controlled very well with the magnetic fluid together with shielding system. In the simulation, the inductive applicator is a ferrite core with diameter of 7 cm and excited by 4 MHz signal. Results have shown that the temperature increments depend on the magnetic fluid nanoparticles. In addition, the magnetic field intensity without damaging the surrounding healthy tissue when used magnetic shielded system. These results demonstrate that it is possible to achieve higher temperatures and to focus magnetic field intensity where the nanoparticles and magnetic shielding system are used.