Il Nuovo Cimento (1955-1965)

, Volume 18, Issue 2, pp 229–240 | Cite as

Magnetic viscosity and annealing in magnetic field

  • G. Biorci
  • A. Ferro
  • G. Montalenti


In the present work we show that a sufficient, but not necessary condition, such as a magnetic material exibits magnetic annealing is that it presents also, in a proper temperature range, diffusion magnetic viscosity. Besides, ifHt is the maximum value of the viscosity field, the energyHtJs is nearly equal to the anisotropy energyKu induced by annealing in a magnetic field, at least for measurements performed at the same temperature. It is also shown that the anomalies of specific heat, associated to the process of annealing, are so small that they cannot be observed experimentally. The experimental verifications are made on iron containing interstitial carbon. The values of the energyHtJs, obtained from the measure of the maximum value of the viscosity field, are lower than, but of the same order of magnitude as those of the induced anisotropy constant, measured directly. If one considers the poor accuracy with whichKu could be determined one can consider the agreement obtained to be satisfactory.


Nel presente lavoro si dimostra che condizione sufficiente ma non necessaria perchè si possa avere energia di anisotropia indotta da ricottura in campo magnetico è che il materiale presenti viscosità magnetica di diffusione. SeHt è il valore massimo del campo magnetico di viscosità, il prodottoHt·Js è pressapoco eguale all’energia di anisotropiaKu indotta da ricottura in campo magnetico. Le anomalie di calore specifico associate al processo di ricottura in campo magnetico sono così modeste che non possono essere osservate sperimentalmente. Le verifiche sperimentali sono state eseguite su ferro contenente carbonio allo stato interstiziale. L’accordo si può considerare soddisfacente.


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  1. (1).
    L. Néel:Journ. Phys. et Rad.,13, 250 (1952).CrossRefGoogle Scholar
  2. (2).
    J. L. Snoek:Physica,5, 663 (1938).ADSCrossRefGoogle Scholar
  3. (3).
    G. Biorci, A. Ferro andG. Montalenti:Solid State Physics, EditorsH. DÉsirant andJ. L. Michiels, vol.3 (London, 1960).Google Scholar
  4. (4).
    G. Biorci, A. Ferro andG. Montalenti:Magnetic riscosity and annealing in magnetic field, Technical Report 3a, A.R.D.C. Contract AF 61(514)-1331 (Nov. 1959).Google Scholar
  5. (5).
    G. Biorci, A. Ferro andG. Montalenti: to be published inPhys. Rev. (1960).Google Scholar
  6. (6).
    H. Pender andR. L. Jones:Phys. Rev.,1, 259 (1913).ADSCrossRefGoogle Scholar
  7. (7).
    J. F. Dillinger andR. M. Bozorth:Physics,6, 279 (1935).ADSCrossRefGoogle Scholar
  8. (8).
    J. F. Dillinger andR. M. Bozorth:Physics,6, 285 (1935).ADSCrossRefGoogle Scholar
  9. (9).
    S. Chikazumi:Journ. Phys. Soc. Japan,5, 327, 334 (1950).ADSCrossRefGoogle Scholar
  10. (10).
    S. Kaya:Rev. Mod. Phys.,25, 49 (1953).ADSCrossRefGoogle Scholar
  11. (11).
    L. Néel:Journ. Phys. et Rad.,15, 225 (1954).CrossRefMATHGoogle Scholar
  12. (12).
    S. Taniguchi andT. Oomura:Sci. Rep. Ritu, A6, 330 (1954).Google Scholar
  13. (13).
    S. Taniguchi andM. Yamamoto:Sci. Rep. Ritu, A7, 269 (1955).Google Scholar
  14. (14).
    S. Taniguchi:Sci. Repts. Res. Inst. Tohoku Univ., Sez. AI, 269 (1955).Google Scholar
  15. (15).
    R. M. Bozorth: A.I.E.E. Publication, T-91, 69 (1957).Google Scholar
  16. (16).
    E. A. Nesbitt, H. J. Williams andR. M. Bozorth:Journ. Appl. Phys.,25, 1014 (1954).ADSCrossRefGoogle Scholar
  17. (17).
    R. D. Heidenreich, E. A. Nesbitt andR. D. Burbank:Journ. Appl. Phys.,30, 995 (1959).ADSCrossRefGoogle Scholar
  18. (18).
    E. A. Nesbitt andR. D. Heidenreich:Journ. Appl. Phys.,30, 1000 (1959).ADSCrossRefGoogle Scholar
  19. (19).
    G. Biorci, A. Ferro andG. Montalenti:Atti Acc. Lineci,5, 542 (1958).Google Scholar
  20. (20).
    F. Galissot andR. Vergne:Compt. Rend.,248, 703 (1959).Google Scholar
  21. (21).
    G. Biorci, A. Ferro andG. Montalenti: A.R.D.C. Contract no. AF 61(513)1331, Technical Note 1a (1958).Google Scholar
  22. (22).
    G. Biorci, A. Ferro andG. Montalenti: A.R.D.C. Contract no. AF 61(514)1331, Technical Note 2a (1958).Google Scholar
  23. (23).
    G. De Vries, D. W. Van Geest, R. Gersdorf andG. W. Rathenau:Physica,25, 1131 (1959).ADSCrossRefGoogle Scholar
  24. (24).
    R. M. Bozorth:Ferromagnetism (New York, 1951), p. 625.Google Scholar
  25. (25).
    W. Köster:Theorie des Ferromagnetismus (Berlin, 1956), p. 160.Google Scholar
  26. (26).
    S. Chikazumi andT. Oomura:Journ. Phys. Soc. Japan,10, 842 (1955).ADSCrossRefGoogle Scholar
  27. (27).
    E. T. Fergusson:Congrès International sur la Physique de l’Etat Solide (Bruxelles, 2 June 1958), to be published.Google Scholar
  28. (28).
    C. D. Graham jr.:Magnetic properties of metals and alloys, inAmer. Soc. for Metal (1959), p. 288.Google Scholar
  29. (29).
    P. Brissoneau:Journ. Appl. Phys.,29, 249 (1958).ADSCrossRefGoogle Scholar

Copyright information

© Società Italiana di Fisica 1960

Authors and Affiliations

  • G. Biorci
    • 1
  • A. Ferro
    • 1
    • 2
  • G. Montalenti
    • 1
  1. 1.Centro Studi ElettrofisicaIstituto Elettrotecnico Nazionale Galileo FerrarisTorino
  2. 2.Istituto Nazionale di Fisica NucleareSezione di TorinoItaly

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