Gamma Irradiation Effects on the Magnetic Properties of Hard Ferrites

Authors: F. Abbas Pour Khotbehsara, B. Salehpour, A. Kianvash

Abstract:

Many industrial materials like magnets need to be tested for the radiation environment expected at linear colliders (LC) where the accelerator and detectors will be subjected to large influences of beta, neutron and gamma’s over their life Gamma irradiation of the permanent sample magnets using a 60Co source was investigated up to an absorbed dose of 700Mrad shows a negligible effect on some magnetic properties of Nd-Fe-B. In this work it has been tried to investigate the change of some important properties of Barium hexa ferrite. Results showed little decreases of magnetic properties at doses rang of 0.5 to 2.5 Mrad. But at the gamma irradiation dose up to 10 Mrad it is showed a few increase of properties. Also study of gamma irradiation of Nd-Fe-B showed considerably increase of magnetic properties.

Keywords: Gamma ray irradiation, Hard Ferrite, Magnetic coefficient, Radiation dose.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1338287

References:

[1] R. D. Brown, and J. R. Cost, “Radiation –Induced Changes in Magnetic Properties of Nd-Fe-B Permanent Magnets”, IEEE Transl., J. Magn., vol.25, 1989, 3117.
[2] S. Okuda, K. Ohashi, and N. Kobayashi, “Effects of electron-beam and gamma Irradiation on the Flux of Nd-Fe-B and Sm-Co Permanent Magnets”, Nucl. Instr. And Meth., B94, 1994, 227
[3] A. I. Schindler, “The Effects of Irradiation on Magnetic Properties of Alloys and Ferrites”, U. S. Naval Research Laboratory, Report 568, Washinton, 1961.
[4] H. B. Luna, X. K. Maruyama, N. J. Colella, S. J. Hobbs , R. S. Hornady, B. Kulke, and J. V. Pallomar, “Bremsstrahlung Radiation Effects in Rare Earth Permanent Magnets”, Nucl. Instr. And Meth., A285, 1989, pp.349- 354.
[5] K. Boockman, M. Liehr,W. Rodewald, E. Salzborn, M. Schlapp, and B. Wall, ‘’Effects of gamma Irradiation on Sm-Co and Nd-Dy-Fe-B Magnets”, Journal of Magnetism and Magnetic materials, 101, 1991, pp.345–346.
[6] H. Pscard, and F. Studer, “Review of Irradiation on Ferrites: Results in the world from 1970 to 1995”, J. Phys. IV Franc 7, C1-211, 1997.
[7] B. Salehpour, PhD Thesis, University of Birmingham, (1981).