One-sided fluxes -- A magnetic curiosity?

Abstract

It is shown that a previously unknown class of magneti" zation patterns exists in planar structures which have the unique property that all the flux escapes from one surface with none leaving the other side. A simple case is a constant amplitude rotating vector magnetization where the sense of rotation dictates which surface has no flux. More complicated magnetization patterns are elucidated. The likelihood that the one"sided flux phe" nomenon occurs partially in the normal write, the contact"printing and the print"through processes of tape recording is discussed. It is concluded that significant improvements in tape recording performance would ensue if means could be found to enhance the e#ect.

Electromagnetic-based evaluation of different Halbach array topologies with gap consideration for the permanent magnet synchronous machines

“…Electromagnetic (EM) solutions possess many technical advantages contrary to conventional topologies in terms of performance of electrical machines using the HABO that results in the improvement and increase in sinusoidal electromotive forces (EMFs) waveforms which originate from an increased sinusoidal airgap flux density distribution, and reduced machine's mass because of its self-shielding magnetization that allows the machine to operate without any back iron [1][2][3][4][5][6]. The main objective is to determine the best possible magnetization orientation with the gap consideration between magnetic segments particularly in the HABOs for the first time.…”

“…3. In 1973, the influence of installing magnetic blocks in a certain order was discovered by Mallinson [1] to achieve higher airgap flux density for the very first time. Afterward, Halbach [2] invented the HABO to focus particle accelerator beams in 1980s.…”

“…Airgap magnetic flux density (T) The angle between the center of the ith segment R 0 , R 1 Inner and outer radii of the magnet (mm) T ph The number of series turns per phase k w1 The fundamental harmonic winding factor Φ m1…”

On the Optimization of Halbach Arrays as Energy Storage Media

“…The phenomenon of having a one-sided flux from a structure was originally described by John C. Mallinson in 1973 [11]. He investigated the effects of having a cuboid body with a magnetization in the material that was continuously rotating from one end to the other.…”

Metamaterial anisotropic flux concentrators and magnetic arrays

“…11,12 For p positive an internal field is generated, which for the important case of p ¼ 1 is spatially uniform. Outside the cylinder, the field is identically zero.…”