Metallic spin glasses

Haushalter RC, O Connor CM, Haushalter JP et al (1984) Synthesis of new amorphous metallic spin-glasses Ct2SnTe4, Mu2SnTe4, Ee2SnTe4, Co2SnTe4 - solvent induced metal-insulator transformations. Angew Chem hit Ed 23(2) 169-170... 

Fig. 27. Scheme of formation of metallic spin glasses (Mydosh 1978). 

Unfortunately, we were unable to find experimental studies on the thermal conductivity of lanthanide metallic spin glasses which attempted to verify eqs. (35) and (36). Figure 28 shows experimental data for the metallic spin-glass alloys AgCr. As one can see, the experimental and theoretical results agree rather well (Ducastel and Pitsi 1986),... 

This anisotropy is of order 1 K only and probably not important for typical metallic spin glasses. It may be relevant for insulating spin glasses Eu, Srj, S (Binder and Kinzel 1983). 

Fert and Levy (1980,1981) propose this DM interaction to be responsible for observed anisotropy effects in metallic spin glasses. The anisotropy field D is randomly distributed (like the T atoms), i.e. there is no global anisotropy axis, but with eq. 4 one gets a macroscopic anisotropy energy of unidirectional character... 

Microscopically, this type of anisotropy in metallic spin glasses is linked to the existence of Dzyaloshinsky-Moriya interactions (see sec. 3.2). This interpretation has been stimulated by hysteresis studies of ternary CuMn spin glasses by Prejean et al. (1980) where the third component is a nonmagnetic impurity of concentration X, Whereas and are found to be independent on x, the width of the hysteresis and hence the anisotropy constant K increases linearly with x (fig. 36). By taking different impurities the authors demonstrate that the spin-orbit interaction is responsible for the anisotropy. 

Metal and polysilicon films are formed by a chemical-vapor deposition process using organometallic gases that react at the surface of the IC structure. Various metal silicide films may also be deposited in this manner by reaction with the surface of the silicon wafer to form metal silicides. Glass and pol3uner films are deposited or spin cast or both, as are photoresist films (those of a photosensitive material). This process is accomplished by applying a liquid polymer onto a rapidly rotating wafer. The exact method used varies from manufacturer to manufacturer and usually remains proprietary. 

The canonical spin glass consists of a noble metal (Au, Ag, Cu, or Pt) diluted with a transition metal ion, such as Fe or Mn. The magnetic interaction in such systems is mediated by the conduction electrons, leading to an indirect exchange interaction—the RKKY (Ruderman and Kittel [70], Kasuya [71], and Yosida [72]) interaction, whose coupling constant J R) oscillates strongly with distance r between the spins as... 

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