Magnetic Interaction Force and a Couple on a Superconducting Sphere in an Arbitrary Dipole Field

2009 ◽  
Vol 22 (5) ◽  
pp. 471-477 ◽  
Author(s):  
D. Palaniappan
Keyword(s):  
Magnetic Interaction ◽  
Interaction Force ◽  
Dipole Field ◽  
Superconducting Sphere

Design and analysis of switchable magnetic polarity bistable energy harvester

2018 ◽  
Vol 233 (9) ◽  
pp. 3018-3037
Author(s):  
Nitin Vijay Satpute ◽  
Lalitkumar M Jugulkar ◽  
Sarika Nitin Satpute ◽  
Siddappa M Khot
Keyword(s):  
Dynamic Performance ◽  
Magnetic Interaction ◽  
Interaction Force ◽  
Magnetic Polarity ◽  
Gear Train ◽  
Electric Generator ◽  
Operational Characteristics ◽  
Acceleration Amplitude ◽  
Electrical Damping ◽  
Bistable Energy Harvester

Multistable vibration harvesters that involve repelling magnet force result in improved efficiency over a wider bandwidth in comparison to the conventional resonant devices. However, the dynamic performance of the vibration harvester can be further improved by switching the magnetic force polarity to ensure pull force on the mass as it moves towards the mean position. In the presented work, the design and analysis of a switching polarity bistable harvester has been presented, which changes the magnetic interaction polarity in order to improve power output as well as efficient operational bandwidth. An innovative mechanism has been developed to operate the harvester with switching polarity for higher base acceleration amplitude. The proposed design has integrated switchable polarity magnetic interaction and rotary electric generator which is driven by a compound gear train in the conventional spring-mass harvester. Analytical and numerical simulations have been formulated to illustrate efficient operational characteristics over the operating frequency band and to determine the optimum electrical damping coefficient. Effects of magnetic interaction force, the inertia of the switching mechanism and gears have been considered in the numerical analysis. A prototype delivered the peak power of 1.49 W at the resonance frequency and exhibited 50% increase in power in comparison to fixed polarity design.

scholarly journals PROBING ATOMIC LEVEL INTERACTIONS IN NI NANORODS AND AFM CANTILEVER USING ATOMIC FORCE MICROSCOPY BASED F–D SPECTROSCOPY

2017 ◽  
Author(s):  
Sudipta Dutta ◽  
Mahesh Kumar Singh ◽  
M. S. Bobji
Keyword(s):  
Atomic Force Microscopy ◽  
Magnetic Interaction ◽  
Interaction Force ◽  
Small Scale ◽  
Magnetic Composite ◽  
Force Microscopy ◽  
Atomic Force ◽  
Lift Height ◽  
Afm Cantilever ◽  
Force Displacement

Atomic force microscopy based force-displacement spectroscopy is used to quantify magnetic interaction force between sample and magnetic cantilever. AFM based F–D spectroscopy is used widely to understand various surface-surface interaction at small scale. Here we have studied the interaction between a magnetic nanocomposite and AFM cantilevers. Two different AFM cantilever with same stiffness but with and without magnetic coating is used to obtain F–D spectra in AFM. The composite used has magnetic Ni nanophase distributed uniformly in an Alumina matrix. Retrace curves obtained using both the cantilevers on magnetic composite and sapphire substrate are compared. It is found for magnetic sample cantilever comes out of contact after traveling 100 nm distance from the actual point of contact. We have also used MFM imaging at various lift height and found that beyond 100nm lift height magnetic contrast is lost for our composite sample, which further confirms our F–D observation.

Magnetic interaction force between high-Tc superconductor-ring and magnet

2001 ◽  
Vol 11 (1) ◽  
pp. 1665-1668 ◽  
Author(s):  
K.B. Ma ◽  
Y. Postrekhin ◽  
H. Ye ◽  
Wei-Kan Chu
Keyword(s):  
Magnetic Interaction ◽  
Interaction Force ◽  
High Tc ◽  
High Tc Superconductor

scholarly journals Influence of a High Static Magnetic Field on the Morphology of Primary Al3Fe Phase in Al-3%Fe Alloy

2021 ◽  
Vol 2101 (1) ◽  
pp. 012070
Author(s):  
Fangwei Jin ◽  
Xueying Ji
Keyword(s):  
Magnetic Field ◽  
Static Magnetic Field ◽  
Nucleation Rate ◽  
Layered Structure ◽  
Applied Field ◽  
Magnetic Interaction ◽  
Interaction Force ◽  
Solidification Structure ◽  
Layer Structures ◽  
Nucleation Work

Abstract It had been done the experiments of the solidification on Al-Fe alloy under a high static magnetic field (10T). The effect of high magnetic field on the morphology of primary Al3Fe phase in Al-3%Fe alloy solidification structure has been investigated by analyzing the microstructures. The experimental results shew that the variation of the morphology of Al3Fe phase was obvious under a high static magnetic field, and them changed to particle-likes and short needles from needle-likes, and they were arranged in chains along the direction of magnetic field to form oriented layered structure. The critical nucleation work reduced and the nucleation rate increased under the applied field, and the magnetic interaction caused by the field can suppress the growth of needle-like Al3Fe phase, both of them resulted in the particle-likes and short needles grains of primary Al3Fe phase to nucleate and grow preferentially. Under the action of magnetic moment and the magnetic interaction force a high static magnetic field, the grains of Al3Fe rotated and then polymerized, and finally formed chain arrangements and layer structures.

Piezoelectric energy reclamation based on frequency up-conversion technique for digital actuator autonomous additional functions

2017 ◽  
Vol 28 (12) ◽  
pp. 1682-1696 ◽  
Author(s):  
Linjuan Yan ◽  
Adrien Badel ◽  
Fabien Formosa ◽  
Laurent Petit
Keyword(s):  
Permanent Magnet ◽  
Cantilever Beam ◽  
Energy Harvester ◽  
Mechanical Energy ◽  
Magnetic Interaction ◽  
Interaction Force ◽  
Vibration Energy ◽  
Optimized Design ◽  
Vibration Energy Harvester ◽  
Piezoelectric Energy

A piezoelectric vibration energy harvester aiming at collecting energy from the operation of an electromagnetic digital actuator is presented. It is based on the frequency up-conversion and can simultaneously obtain the information of discrete position location. The objective is an improved reliability of such digital actuators ensuring sample controls of the actuator positions. The considered electromagnetic digital actuator is capable of achieving two-dimensional in-plane movements by switching a mobile permanent magnet among four discrete positions. The demonstration of a first step toward integrated additional autonomous functions scavenging a part of the mechanical energy of the mobile permanent magnet is achieved. The vibration energy harvester consists of a piezoelectric cantilever beam magnetically attached to the mobile permanent magnet. The limited magnetic interaction force allows a frequency up-conversion strategy to be set. The frequency up-conversion technique that is used here consists of a “low frequency” excitation that drives a much higher natural frequency oscillator. Indeed, once the energy harvester separates from the mobile permanent magnet, a free oscillation occurs and the induced mechanical energy is harvested. This design concept is numerically analyzed and experimentally validated. Harvested energy of 4.7 µJ is obtained from preliminary experiments using a simple out-of-plane cantilever beam with 9 N/m stiffness and 16 mN magnetic attraction between the vibration energy harvester and the mobile permanent magnet when they contact each other. This energy is in accordance with the requirements for wireless communication of simple information. Finally, an L-shaped cantilever beam optimized design is proposed for future in-plane integration.

scholarly journals Interaction Force between a Small Magnet and a Superconducting Sphere

2019 ◽  
Vol 30 (2) ◽  
pp. 3-7
Author(s):  
Ahmad Subahi Ahmad Subahi
Keyword(s):  
Boundary Conditions ◽  
Interaction Force ◽  
Method Of Images ◽  
Superconducting Sphere ◽  
Geometrical Dimensions

The interaction force between a small magnet and a superconducting sphere is calculated using the method of images. Our approach can be easily verified by applying boundary conditions. This work will possesses and clear the discrepancies found in the literature. For collinear dipoles case (small magnet and its image), we found the elevated force to be dependent on the geometrical dimensions of the problem

Structural Investigation of Iron Particles Used for Magnetic Recording Media

1980 ◽  
Vol 38 ◽  
pp. 406-407
Author(s):  
Alfred Baltz
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Electron Microscope ◽  
Structural Investigation ◽  
Magnetic Interaction ◽  
Recording Media ◽  
Magnetic Recording Media ◽  
Recording Medium ◽  
Iron Particles ◽  
Transmission Electron

As part of a program to develop iron particles for next generation recording disk medium, their structural properties were investigated using transmission electron microscopy and electron diffraction. Iron particles are a more desirable recording medium than iron oxide, the most widely used material in disk manufacturing, because they offer a higher magnetic output and a higher coercive force. The particles were prepared by a method described elsewhere. Because of their strong magnetic interaction, a method had to be developed to separate the particles on the electron microscope grids.

MAGNETIC INTERACTION IN SELF-REVERSING ANDESITIC PUMICE IN RELATION TO IRON ALLOYS

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-2065-C8-2066
Author(s):  
M. Haag ◽  
F. Heller ◽  
R. Allenspach
Keyword(s):  
Magnetic Interaction ◽  
Iron Alloys
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