Flow of a magnetizable fluid at temperatures close to the curie point

1984 ◽  
Vol 24 (4) ◽  
pp. 517-520
Author(s):  
V. I. Vishnyakov ◽  
I. F. Sulmanov ◽  
I. A. Fedomov
Keyword(s):  
Curie Point ◽  
Magnetizable Fluid

ELASTIC CONSTANTS OF IRON IN THE VICINITY OF THE CURIE POINT

1971 ◽  
Vol 32 (C1) ◽  
pp. C1-415-C1-416 ◽  
Author(s):  
L. ALBERTS ◽  
M. BOHLMANN ◽  
H. L. ALBERTS
Keyword(s):  
Elastic Constants ◽  
Curie Point

Curie-point switching in Mn-Bi films

1969 ◽  
Vol 5 (3) ◽  
pp. 298-299 ◽  
Author(s):  
G. Lewicki
Keyword(s):  
Curie Point

Overlapping energy bands and the theory of collective electron ferromagnetism

1953 ◽  
Vol 49 (1) ◽  
pp. 115-129 ◽  
Author(s):  
A. B. Lidiard
Keyword(s):  
Curie Point ◽  
Energy Band ◽  
Spontaneous Magnetization ◽  
Copper Alloys ◽  
Implicit Assumption ◽  
Energy Bands ◽  
Unknown Parameters ◽  
Nickel Copper ◽  
Predicted Values ◽  
A Minor

ABSTRACTThe theory of collective electron ferromagnetism given by Stoner applies to a system of electrons in a single energy band; for iron, cobalt and nickel this is identified with the band of states derived from atomic 3d functions. To bring in the generally assumed overlapping of the 3d band by the wide 4s band in these metals, the theory has been extended to take account of the transfer of electrons from 3d to 4s states with change of temperature. A previous calculation of this transfer effect must be regarded as inadequate, for the part played by the exchange energy in determining the distribution of electrons between the two sets of states was omitted. The general equations are derived in § 2 and used as a basis for discussion of the properties of nickel-copper alloys at absolute zero in § 3. In §§4 and 5 numerical results are presented which show the effect of the overlapping 4s band on the magnetic properties of a system such as nickel both above and below its Curie point. Comparison with the measured paramagnetic susceptibility of pure nickel above the Curie point strongly suggests that for this metal the overlapping 4s band has only a minor influence, although in principle the effect could be very large (cf. Fig. 4). This result is not unambiguous, however, because values thus inferred for the two unknown parameters lead to inaccurate predictions below the Curie point. First, the predicted values for the spontaneous magnetization are too small. Secondly, the theory demands that the nickel-copper alloys should only be ferromagnetic below a copper content of about 20 %, whereas experimentally the limit is known to be about 60 %. In conclusion, it is suggested that the implicit assumption of Stoner's theory that the exchange integrals between all pairs of 3d states are equal to one another is a more serious restriction on the theory than the consideration of only a single energy band.

scholarly journals Estimation of Curie-point depths, geothermal gradients and near-surface heat flow from spectral analysis of aeromagnetic data in the Loum – Minta area (Centre-East Cameroon)

2018 ◽  
Vol 27 (4) ◽  
pp. 1291-1299
Author(s):  
Jean Aimé Mono ◽  
Théophile Ndougsa-Mbarga ◽  
Yara Tarek ◽  
Jean Daniel Ngoh ◽  
Olivier Ulrich Igor Owono Amougou
Keyword(s):  
Spectral Analysis ◽  
Heat Flow ◽  
Curie Point ◽  
Surface Heat ◽  
Aeromagnetic Data ◽  
Near Surface ◽  
Geothermal Gradients ◽  
Surface Heat Flow

Internal Field ofFe57in Ni in the Region of the Curie Point

1965 ◽  
Vol 15 (15) ◽  
pp. 628-632 ◽  
Author(s):  
D. G. Howard ◽  
B. D. Dunlap ◽  
J. G. Dash
Keyword(s):  
Curie Point ◽  
Internal Field
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