Abstract
We report on studies of magneto-transport properties and structure (by neutron and X-ray diffraction techniques) at 5-300K in glass coated Co29Ni25Mn1Cu45 microwires prepared by the Taylor-Ulitovsky technique. Annealing of the sample (973 K during 1 hour) results in an increasing of room temperature coercivity (Hc) from 65 Oe up to 800 Oe. Considerable magneto-resistance, MR, is found in both in as-prepared and annealed microwires increasing up to about 4% in the annealed samples. Magnetic field dependence of MR in as-prepared and annealed samples is quite different. Roughly monotonic decay is observed in as-prepared microwires. Annealed sample exhibits a maximum and considerable hysteresis on magnetic field dependence of MR. Neutron diffraction allows to distinguish two peaks in the as-prepared sample and 3 peaks in annealed samples. Observed changes in temperature dependence of magnetic properties and of MR are correlated to the structure changes with temperature. (© 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
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