Magnetoresistance anisotropy and magnetization reversal processes in two different kinds of amorphous ferromagnets: a-Tb/sub 20/(Fe/sub 4/Co/sub 1/)/sub 80/ and a-U/sub 45/Sb/sub 45/Mn/sub 10/

New amorphous U-Sb-Mn ferromagnets with magnetoresistance anisotropy reaching 9% at low temperature have been recently discovered. The magnetoresistance hysteresis cycles for these systems are compared with those obtained in amorphous Tb-Fe-Co films. Results are discussed in terms of excess resistivity caused by domain walls at +or-H/sub c/ and resistivity anisotropy at saturation. Both effects are important in a-Tb-Fe-Co and U-Sb-Mn. The excess resistivity at +or-H/sub c/ scales with mod beta ' mod /sup 2/ where beta ' is the tangent of the Hall angle.<
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