Magnetic properties: of alloys

Many other atom-probe analyses of different phases in different types of steels exist as steels are one of the most important materials. It is possible to investigate how the magnetic properties of alloys are correlated to the microstructures of different phases in the alloys.57,58,59 The chemical contents, growth process and structures of metallic carbides in different alloy steels have been studied with the field ion microscope and the atom-probe field ion microscope.60 61 62 63 We refer the reader to some of the original papers published on these subjects. 

The range of coherence follows naturally from the BCS theory, and we see now why it becomes short in alloys. The electron mean free path is much shorter in an alloy than in a pure metal, and electron scattering tends to break up the correlated pairs, so dial for very short mean free paths one would expect die coherence length to become comparable to the mean free path. Then the ratio k i/f (called the Ginzburg-Landau order parameter) becomes greater than unity, and the observed magnetic properties of alloy superconductors can be derived. The two kinds of superconductors, namely those with k < 1/-/(2T and those with k > l/,/(2j (the inequalities follow from the detailed theory) are called respectively type I and type II superconductors. 

Dining a study of the magnetic properties of alloys heat treated at 1870K for 5 hours in the pseudobinary system Gd5(Sij Gei j)4, Holtzberg et al. (1967) report extended solubility of Si in Gd5Ge4 (0.0[Pg.38]

Mironov, K.E., G.P Brygalina and V.N. Ikorskij, 1975, The dependence of magnetic properties of alloys in Eu P system versus their composition, in Alloys of Rare Earth Metals with Unique Physical and Chemical Properties (Nauka, Moscow) pp. 121-123. In RussiaiL... 

Table 1. Magnetic Properties of Fully Annealed Iron and Iron Alloys ...

Iron—Aluminum and Iron—Aluminum—Silicon Alloys. The influence of aluminum on the physical and magnetic properties of iron is similar to that of silicon, ie, stabilization of the bcc phase, increased resistivity, decreased ductility, and decreased saturation magnetization, magnetocrystalline anisotropy, and magnetostriction. Whereas Si—Ee alloys are well estabHshed for electrical appHcations, the aluminum—iron alloys have not been studied commercially. However, small (up to ca 0.3%) amounts of A1 have been added to the nonoriented grades of siHcon steel, because the decrease in ductiHty is less with A1 than with Si. 

ASM (1959) Magnetic Properties of Metals and Alloys (multiple authors, no editor) (American Society for Metals, Cleveland, Ohio). 

The pressure sensitivity of the magnetic properties of the Invar alloys is indicated by extensive measurements of the coefficient of saturation magnetization change with pressure M dMJdP for various compositions as shown in Fig. 5.10. The exceedingly large values in the 30%-40% Ni range are evident and much in excess of the values for iron and nickel. The 30-wt% Ni composition in the fee phase is the most sensitive to pressure, whereas this... 

INVESTIGATION OF GALVANO-MAGNETIC PROPERTIES OF TRANSITION METAL ALLOY SYSTEMS USING THE KUBO-GREENWOOD EQUATION... 

Koretzky [83] in 1963 published a review of electrodeposited magnetic films, which considers an earlier generation of storage devices. Some magnetic properties of electroplated Co alloys were tabulated by Safranek [84] and by Morral [85]. 

The structures of electroplated hard alloys have been less extensively studied than those of similar electrolessly deposited materials. Sallo and co-workers [118-120] have investigated the relationship between the structure and the magnetic properties of CoP and CoNiP electrodeposits. The structures and domain patterns were different for deposits with different ranges of coercivity. The lower-f/c materials formed lamellar structures with the easy axis of magnetization in the plane of the film. The high-Hc deposits, on the other hand, had a rod-like structure, and shape anisotropy may have contributed to the high coercivity. The platelets and rods are presumed to be isolated by a thin layer of a nonmagnetic material. 

M Since the discovery of the magnetic properties of the cobalt alloy, samarium has been the "superstar" of the lanthanides. Music fans have their ears covered with samarium in the form of modem earphones... 

We used the common principles of quantitative analysis of additive properties of alloys developed in work [3].The following equation that describes the magnetic effect during the crystallization of the amorphous alloy Fes2Si2Bi6 was got ... 

A. Ye, Yermakov, Ye., Ye., Yurchikov, V.A. Barinov, Magnetic properties of amorphous powders of Y-Co alloys prepared by mechanical alloying, Fiz Metal. MetaUoved. Phys. Met. Metall. USSR), 52(52-56) (1981) 1184-1193. 

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