Amorphous magnet

T. Egami, Magnetic amorphous alloys. Report. Prog. Phys., 47 1601 (1984). 

After presenting the sample preparation in Sect. 5.2, we give an introduction to the theoretical background in Sect. 5.3. In Sect. 5.4, we briefly review the electronic influence on structure and phase stability of crystalline Hume-Rothery phases. In Sect. 5.5, we discuss the properties of non-magnetic amorphous alloys of the type just mentioned. The electronic influence on structure (5.5.1) and consequences for the phase stability (5.5.2) are also discussed. Structural influences on the electronic density of states are shown in 5.5.3. Electronic transport properties versus composition indicate additionally the electron-structure interrelation (5.5.4), and those versus temperature, the influence of low-lying collective density excitations (5.5.5). An extension of the model of the electronic influence on structure and stability was proposed by Hdussler and Kay [5.21,22] whenever local moments are involved as, for example, in Fe-containing alloys. In Sect. 5.6, experimental indications for such an influence are presented, and additional consequences on phase stability and magnetic properties are briefly discussed. 

An isotropic and non-magnetic. amorphous alloy has only two independent second order elastic constants. The other elastic moduli are related through the equations [30] ... 

Sugimoto, M. (1989). Research trends of magnetic amorphous oxides. In Advances in Ceramics Proceedings of the Fifth International Conference on Ferrites, India, 1989, Vol. 1. Eds. C. M. Srivastava and M. J. Patni. Oxford IBH Publishing Co PVT Ltd, Bombay, pp. 3-12. 

Matsuyama, H., Eguchi, H. Karamon, H. (1990). The high-resistive soft magnetic amorphous films consisting of cobalt, iron, boron, silicon and oxygen, utilized for video head devices. Journal of Applied Physics, 67, 5123-5. 

Munakata, M., Yagi, M., Shimada, Y High-resistive (CoFeB)-(Si02) soft magnetic amorphous film for micro-cores in a few MHz range. IEEE Trans. Magn. 35, 3430-3432 (1999)... 

The soft magnetic amorphous alloys are based on the ferromagnetic elements Fe, Co, andNi with additions of metalloid elements, the so-called glass forming elements Si, B, C, and P. The most stable alloys contain about 80 at.% transition metal (TM) and 20 at.% metalloid (M) components. 

Table ft.3-23 Survey of soft magnetic amorphous and nanocrystaUine alloys. Some amorphous alloy of METGLAS (AUied Signal Inc., Morristown/NJ) and VITROVAC (Vacuumschmelze GmbH, Hanau, Germany) have been selected from commercially available alloys [3.12]... 

Table 4.3-23 gives a survey of the magnetic and physical properties of several soft magnetic amorphous alloys... 

G. Le Caer, J.M. Dubois, H. Fisher, U. Gonser, H.G. Wagner, On the validity of Fe hyperfine field distribution calculations from Mossbauer spectra of magnetic amorphous alloys. Nucl. Instrum. Meth. Phys. Res. B 5, 25-33 (1984)... 

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