Summary
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, ifH t is the maximum value of the viscosity field, the energyH tJs is nearly equal to the anisotropy energyK u 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 energyH tJs, 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 whichK u could be determined one can consider the agreement obtained to be satisfactory.
Riassunto
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. SeH t è il valore massimo del campo magnetico di viscosità, il prodottoH t·Js è pressapoco eguale all’energia di anisotropiaK u 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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References
L. Néel:Journ. Phys. et Rad.,13, 250 (1952).
J. L. Snoek:Physica,5, 663 (1938).
G. Biorci, A. Ferro andG. Montalenti:Solid State Physics, EditorsH. DÉsirant andJ. L. Michiels, vol.3 (London, 1960).
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).
G. Biorci, A. Ferro andG. Montalenti: to be published inPhys. Rev. (1960).
H. Pender andR. L. Jones:Phys. Rev.,1, 259 (1913).
J. F. Dillinger andR. M. Bozorth:Physics,6, 279 (1935).
J. F. Dillinger andR. M. Bozorth:Physics,6, 285 (1935).
S. Chikazumi:Journ. Phys. Soc. Japan,5, 327, 334 (1950).
S. Kaya:Rev. Mod. Phys.,25, 49 (1953).
L. Néel:Journ. Phys. et Rad.,15, 225 (1954).
S. Taniguchi andT. Oomura:Sci. Rep. Ritu, A6, 330 (1954).
S. Taniguchi andM. Yamamoto:Sci. Rep. Ritu, A7, 269 (1955).
S. Taniguchi:Sci. Repts. Res. Inst. Tohoku Univ., Sez. AI, 269 (1955).
R. M. Bozorth: A.I.E.E. Publication, T-91, 69 (1957).
E. A. Nesbitt, H. J. Williams andR. M. Bozorth:Journ. Appl. Phys.,25, 1014 (1954).
R. D. Heidenreich, E. A. Nesbitt andR. D. Burbank:Journ. Appl. Phys.,30, 995 (1959).
E. A. Nesbitt andR. D. Heidenreich:Journ. Appl. Phys.,30, 1000 (1959).
G. Biorci, A. Ferro andG. Montalenti:Atti Acc. Lineci,5, 542 (1958).
F. Galissot andR. Vergne:Compt. Rend.,248, 703 (1959).
G. Biorci, A. Ferro andG. Montalenti: A.R.D.C. Contract no. AF 61(513)1331, Technical Note 1a (1958).
G. Biorci, A. Ferro andG. Montalenti: A.R.D.C. Contract no. AF 61(514)1331, Technical Note 2a (1958).
G. De Vries, D. W. Van Geest, R. Gersdorf andG. W. Rathenau:Physica,25, 1131 (1959).
R. M. Bozorth:Ferromagnetism (New York, 1951), p. 625.
W. Köster:Theorie des Ferromagnetismus (Berlin, 1956), p. 160.
S. Chikazumi andT. Oomura:Journ. Phys. Soc. Japan,10, 842 (1955).
E. T. Fergusson:Congrès International sur la Physique de l’Etat Solide (Bruxelles, 2 June 1958), to be published.
C. D. Graham jr.:Magnetic properties of metals and alloys, inAmer. Soc. for Metal (1959), p. 288.
P. Brissoneau:Journ. Appl. Phys.,29, 249 (1958).
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The research reported in this document has been sponsored by the Air Force Office of Scientific Research of the Air Research and Development Command United States Air Force through its European Office, under Contract no. AF 61(514)-1331
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Biorci, G., Ferro, A. & Montalenti, G. Magnetic viscosity and annealing in magnetic field. Nuovo Cim 18, 229–240 (1960). https://doi.org/10.1007/BF02725935
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DOI: https://doi.org/10.1007/BF02725935