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Theory of Long Period Magnetic Relaxation

Charles Kittel

  • Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts

Phys. Rev. 69, 640 – Published 1 June, 1946

DOI: https://doi.org/10.1103/PhysRev.69.640

Abstract

A discussion is given of the long period changes in magnetization in a mild steel specimen subjected to alternating stresses while in a weak magnetic field. The magnetization changes appear to occur with two time constants, of the order of three months and five years. A formal treatment of the phenomena is given along the lines of the time-dependent barrier potential used by Snoek in discussing other magnetic relaxation processes. The increase in the potential barrier is pictured as caused by the mechanical relaxation of local strains.

References (5)

  1. J. A. Ewing, Magnetic Induction in Iron (The Electrician Publishing Company, London, 1892)
  2. J. L. Snoek, Physica 5, 663 (1938)
  3. R. L. Downdell, Am. Soc. Metals Trans. 22, 19 (1934) Trans. Am. Soc. Steel Treat. 5, 27 (1924)
  4. R. Becker and W. Doering, Ferromagnetismus (Edwards Brothers, Ann Arbor, Michigan, 1943)
  5. F. Bitter, Introduction to Ferromagnetism (McGraw-Hill Book Company, Inc., New York, 1937)

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