K. Mandal et Sk. Ghatak, LARGE MAGNETORESISTANCE IN AN AMORPHOUS CO68.1FE4.4SI12.5B15 FERROMAGNETIC WIRE, Physical review. B, Condensed matter, 47(21), 1993, pp. 14233-14236
Magnetoresistance and magnetization of an amorphous ferromagnetic wire
having nominal composition Co68.1Fe4.4Si12.5B15 are measured from 77
to 300 K and in the presence of tensile stress sigma (0 less-than-or-e
qual-to sigma less-than-or-equal-to 240 MPa). A large negative magneto
resistance is observed with accompanying hysteresis. The maximum chang
e in resistance that occurs at small field increases from 8.8% at sigm
a=0 to 12.2% at sigma=240 MPa; this occurs at 300 K but the change is
much reduced with the decrease of temperature. The results are discuss
ed in terms of the scattering of carriers by a domain wall and it is s
uggested that the magnetization reversal is mainly due to coherent rot
ation.