O V Stognei et al 2003 J. Phys.: Condens. Matter 15 4267 doi:10.1088/0953-8984/15/24/320
O V Stognei1,4, Yu E Kalinin1, I V Zolotukhin1, A V Sitnikov1, V Wagner2 and F J Ahlers3
Show affiliationsGiant magnetoresistivity (GMR) at different temperatures as well as magnetization processes were studied in amorphous granular composites (Co41Fe39B20)x (SiOn)100−x over a wide concentration range (20 ≤ x, at. % ≤ 59). Magnetoresistivity of the composites with large dielectric content (below a percolation threshold) is enhanced on cooling down to 77 K and reaches 7% in (Co41Fe39B20)30 (SiOn)70. The observed GMR enhancement directly correlates with the rise of the relative change of the composites magnetization ([m77 − m300 ]/m300) occurring on temperature reduction. The temperature dependence of the composite's GMR exhibits a clear maximum in the vicinity of 77 K if a wider temperature range (2–300 K) is considered. The difference between the GMR values measured at 77 and 2 K is one order of magnitude. Strong Coulomb blockade is observed in this composite at low temperature.
75.47.De Giant magnetoresistance
72.20.My Galvanomagnetic and other magnetotransport effects
75.50.Kj Amorphous and quasicrystalline magnetic materials
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
Issue 24 (25 June 2003)
Received 14 February 2003, in final form 29 April 2003
Published 6 June 2003
O V Stognei et al 2003 J. Phys.: Condens. Matter 15 4267
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