Optimization of systems of permanent magnets

Samofalov, V. N.; Belozorov, D. P.; Ravlik, A. G.

doi:10.1134/s0031918x06110068

Cited by 20 publications

(19 citation statements)

References 6 publications

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“…[5]. The absolute value of this field at x ¼ 0 can be taken as a cost function, which must be minimized over all the permutations of the magnets to find the optimum arrangement in the ring.…”

Section: Variation Of Magnet Propertiesmentioning

confidence: 99%

Dipolar Halbach magnet stacks made from identically shaped permanent magnets for magnetic resonance

Soltner¹,

Blümler²

2010

Concepts Magnetic Resonance

114

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NMR Mandhalas (Magnetic Arrangement for Novel Discrete Halbach LAyout) are arrays of identically shaped magnets in a Halbach-type arrangement. They provide a simple and cost-effective way to generate high magnetic fields for mobile applications, for example, in magnetic resonance. Based on the introductory publication by Raich and Blü mler (Concepts Magn Reson 2004;23B:16-25), we extend the notion of Mandhalas from cube-shaped magnets to polygonal and cylindrical ones and present construction guidelines for the stacking of such rings to generate homogeneous magnetic fields over larger volumes. For this purpose, we present formulas and numerical values based on a dipole approach to calculate the flux density of single rings and composed 3D systems and compare to corresponding results obtained by 3D boundary element method calculations. As an application of the approach presented here, we constructed prototypes.

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Section: Variation Of Magnet Propertiesmentioning

confidence: 99%

Dipolar Halbach magnet stacks made from identically shaped permanent magnets for magnetic resonance

Soltner¹,

Blümler²

2010

Concepts Magnetic Resonance

114

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“…Two series of films are explored. Among them are: slack-anisotropy Ni 80 -Fe 20 specimen with an anisotropy field H K = 200-300 A/m and strong-anisotropy Ni 65 -Fe 17 -Co 18 film with H K =1500-2000 A/m [2]. Magnetic resonance spectra of the samples were recorded in the wide frequency band (ν≈9.5GHz, 20-27GHz and 30-37 GHz) at room temperature.…”

Section: Experimental Results and Theoretical Discussionmentioning

confidence: 99%

“…A magnetic field of about 10 kA/m was applied to create an uniaxial anisotropy in each magnetic layer during the evaporation processes. The samples [2] were performed as strips width b = 3-10 µm and length l>>b. The thickness of the two ferromagnetic layers are identical and equal t 1 =t 2 = 80 nm.…”

Section: Experimental Results and Theoretical Discussionmentioning

confidence: 99%

Magnetic anisotropy studies on FeNiCo/Ta/FeNiCo three layers film by layer sensitive ferromagnetic resonance technique

Yıldız

Kazan

Aktaş

et al. 2004

phys. stat. sol. (c)

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Two ferromagnetic layers that are separated by a non-magnetic spacer have been deposited in the presence of an external Dc magnetic field that has been applied in a mutually perpendicular direction during the deposition of each layer. This thin three-layer film of FeNiCo/Ta/FeNiCo was then studied by electron spin resonance (ESR) technique for different directions of the external magnetic field with respect to the film plane. Beside very anisotropic and strong two main modes, relatively well-resolved and very weak subsidiary peaks in ESR spectra were observed on low field side of the main modes for almost every direction of the external field. The anisotropic behavior as the field is rotated from the film normal towards to the film plane is due to strong demagnetizing field. However, two fold (axial) small anisotropies having 90 degrees phase shifts with respect to the peaks from two different layers were seen to originate from field-induced anisotropy. The small peaks are attributed to magnetostatics modes as well.

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“…Systems of high-anisotropic magnets, which generate strong magnetic stray fields (SFs) namely the fields their strength exceeds the induction of the magnet material H4B r ¼ 4pM r [1][2][3][4][5][6][7], are of great interest as little-studied objects of magnetostatics and, besides, due to potentiality for various technical applications [8,9]. M r is the magnetization value of the magnet in zero external field (the magnet was premagnetized to saturation).…”

Section: Introductionmentioning

confidence: 99%

“…Two possible kinds of strong SFs exist for uniformly magnetized magnets, for example, in the form of prism, its combination or other bodies [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

The permanent magnet systems generating strong stray fields with large localization region

Samofalov

Belozorov

Ravlik

2008

Journal of Magnetism and Magnetic Materials

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Optimization of systems of permanent magnets

Cited by 20 publications

References 6 publications

Dipolar Halbach magnet stacks made from identically shaped permanent magnets for magnetic resonance

Dipolar Halbach magnet stacks made from identically shaped permanent magnets for magnetic resonance

Magnetic anisotropy studies on FeNiCo/Ta/FeNiCo three layers film by layer sensitive ferromagnetic resonance technique

The permanent magnet systems generating strong stray fields with large localization region

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