scholarly journals On the magnetic deformation of nickel

1898 ◽  
Vol 63 (389-400) ◽  
pp. 44-54 ◽  
Keyword(s):  
Royal Society ◽  
Unit Area ◽  
Nickel Wire ◽  
Soft Magnetic ◽  
Magnetic Metal ◽  
Longitudinal Tension

On a former occasion a paper was com m unicated to the Royal Society containing an account of some measurements of the magnetic contraction of a nickel wire, and a com parison of these with the values deduced from K irchhoff’s theory. It was there shown that the most important term in the calculated value of the elongation of a long wire of a soft magnetic metal is represented by ½ H(ôI/ôP), where H is the magnetising field and ôI the increase of mgnetisation produced by a small increase of longitudinal tension ôP per unit area. The results showed that the observed contraction in nickel was much greater than the calculated value.

Review on Soft Magnetic Metal and Inorganic Oxide Nanocomposites for Power Applications

2021 ◽  
pp. 159500
Author(s):  
A. Talaat ◽  
M.V. Suraj ◽  
K. Byerly ◽  
A. Wang ◽  
Y. Wang ◽  
...  
Keyword(s):  
Soft Magnetic ◽  
Inorganic Oxide ◽  
Magnetic Metal

scholarly journals Nanostructure and compositional segregation of soft magnetic FeNi‐based nanocomposites with multiple nanocrystalline phases

2021 ◽  
Vol 36 (1) ◽  
pp. 105-113
Author(s):  
P. Ohodnicki ◽  
E.J. Kautz ◽  
A. Devaraj ◽  
Y. Yu ◽  
N. Aronhime ◽  
...  
Keyword(s):  
Atom Probe ◽  
Free Energies ◽  
Orientation Relationships ◽  
Soft Magnetic ◽  
Transmission Electron ◽  
Magnetic Metal ◽  
Show Evidence ◽  
Multi Phase ◽  
Nanocrystalline Phases

AbstractSoft magnetic metal amorphous nanocomposite alloys are produced through rapid solidification and thermal annealing yielding nanocrystals embedded within an amorphous precursor. Similar free energies in Co‐rich and FeNi‐based alloy systems result in multiple nanocrystalline phases being formed during devitrification. Studies of multi‐phase crystallization processes have been reported for Co‐rich alloys but relatively few have investigated FeNi‐based systems. A detailed characterization of compositional partitioning and microstructure of an optimally annealed FeNi‐based MANC (Fe70Ni30)80Nb4Si2B14 alloy is presented through complementary high‐resolution transmission electron microscopy (HRTEM) and atom probe tomography (APT). HRTEM demonstrates orientation relationships between FCC and BCC nanocrystals, suggesting heterogeneous nucleation of nanocrystals in the amorphous matrix or a cooperative mechanism of nucleation between BCC and FCC nanocrystallites. APT results show evidence for (i) the segregation of Fe and Ni between nanocrystals of different phases, (ii) B partitioning to the amorphous phase, and (iii) an Nb‐enriched shell surrounding nanocrystals.

VII.—The Axial Inclination of Curves of Thermoelectric Force: a Case from the Thermoelectrics of Strained Wires

1914 ◽  
Vol 34 ◽  
pp. 64-68
Author(s):  
John McWhan
Keyword(s):  
Thermoelectric Properties ◽  
Small Angle ◽  
Royal Society ◽  
Pure Metal ◽  
The Other ◽  
Great Care ◽  
Remarkable Result ◽  
Longitudinal Tension ◽  
Metal Wires

In a communication to the Royal Society of Edinburgh, Mr J. D. Hamilton Dickson has examined with great care the valuable results of Professors Dewar and Fleming on the thermoelectromotive forces of various couples, and has come to the conclusion that the curve representing the thermo E.M.F. is in every case a parabola whose axis is, not vertical as had always been assumed, but inclined a definite though very small angle to the E.M.F.-axis.This remarkable result has led me to go back to some experiments which I made a few years ago on the thermoelectric properties of longitudinally strained metal wires, to see if by any chance the same phenomenon might be detected there, and in one instance (only) I have been able to establish its existence unmistakably. The experiments in question, which I have described elsewhere,† were made on couples consisting each entirely of one and the same pure metal; but one wire of the couple might be subjected to any desired longitudinal tension while the other remained unstrained. The temperatures of the junctions were the same in all the experiments, one junction being steam-heated, the other water-cooled.

scholarly journals XVIII.—On Some Relations between Magnetism and Twist in Iron and Nickel (and Cobalt). Parts II. and III

1892 ◽  
Vol 36 (2) ◽  
pp. 485-535
Author(s):  
Cargill G. Knott
Keyword(s):  
Royal Society ◽  
Approximate Calculation ◽  
Nickel Wire ◽  
Iron Tube ◽  
A Current

This paper forms the continuation of a paper already communicated to the Royal Society of Edinburgh, and published in the Transactions (vol. xxxv. pp. 377–390). Strictly speaking, it is third of a series bearing on the same subject. In the first I showed that when a current is passed along a longitudinally magnetised nickel wire a twist is produced similar in character but opposite in direction to the twist which Wiedemann discovered to be produced in iron similarly treated. This was the chief result arrived at; but other results were also obtained, especially with regard to the influence of tension, which called for further investigation. In the later paper, the influence of tension was more thoroughly studied; and also the effect of change of temperature. I also discussed more fully the suggestion first made by Maxwell that the effect discovered by Wiedemann can be explained in terms of the changes of length which Joule observed in iron when magnetised. Obviously the same explanation must be extended to the case of nickel, which Barrett had found also to be subject to changes of length when magnetised. Mr Bidwell's recent elaborate measurements of these changes of length enabled me to make an approximate calculation of the twist in an iron tube longitudinally and circularly magnetised. The comparison of the result as calculated for a tube with the result observed for a wire of the same diameter, established, in my opinion, the sufficiency of Maxwell's explanation.

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