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Magnetoresistance-a probe to study the local magnetic environment in amorphous alloys with ferromagnetic and 'spin-glass' transitions.
R. Crook, E. D. Dahlberg, K. V. Rao
Rapidly Quenched Metals. Proceedings of the Fifth International Conference. North-Holland. 1985 2 p. 1239 (1239).
Abstract: An interesting aspect of amorphous materials arises from the fact, that because of the high disorder in the systems, the electron mean free path is short ( approximately 10 AA). Hence, magnetoresistance as a probe of short length scales, can provide valuable information on the local anisotropy, as well as systematic variations in the local magnetic environment as a function of temperature. The authors have used this approach to gain insight into possible microscopic descriptions of amorphous magnetic alloys which lose long-range ferromagnetic order acquired at a higher temperature T/sub c/, and exhibit a spin-glass like character below a temperature T/sub f/. Specifically, they have measured the transverse and longitudinal magnetoresistance of Fe/sub 10/Ni/sub 65/B/sub 15/Si/sub 10/, Fe/sub 15/Ni/sub 60/P/sub 16/B/sub 6/Al/sub 3/, Fe/sub 90/Zr/sub 10/, and Fe/sub 91/Zr/sub 9/ amorphous melt-spun alloys in applied fields up to 80 kilo-Gauss from 4 K to 250 K. They discuss correlations between the magnetoresistance and bulk magnetization data for the same samples, and comments are also made on the general consequence of these studies towards plausible microscopic descriptions of the 'spin-glass' like regime. (6 References).
last modified:
10.Jun.2002
by Thomas Gredig