Demagnetizing factors for a hollow sphere

Prat-Camps, Jordi, Navau, Carles, Sanchez, Alvaro and Chen, Du-Xing (2015) Demagnetizing factors for a hollow sphere. IEEE Magnetics Letters, 7 (130010). pp. 1-4. ISSN 1949-307X

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Abstract

The demagnetization problem for a hollow sphere of inner radius a, outer radius b, and material susceptibility χ is solved analytically. As a/b increases from 0 to 1, the magnetometric demagnetizing factor Nm decreases from 1/3 when χ > 0 and increases from 1/3 when χ <; 0. In the limit a/b = 1, Nm decreases from 1 to 0 as χ increases from -1 to ∞. As a/b increases from 0 to 1, the fluxmetric demagnetizing factor Nf decreases from 1/3 and has a negative minimum when χ <; -3/4. These features are explained conceptually and quantitatively. As an application, magnetic shielding by a spherical shell is quantitatively analyzed.

Item Type: Article
Schools and Departments: School of Engineering and Informatics > Informatics
Subjects: Q Science > QC Physics > QC0501 Electricity and magnetism > QC0750 Magnetism
Depositing User: Jordi Prat Camps
Date Deposited: 24 Apr 2018 11:11
Last Modified: 02 Jul 2019 16:00
URI: http://sro.sussex.ac.uk/id/eprint/75343

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