Magnetic and transport properties of amorphous FeAuB films

Magnetic and galvanomagnetic properties are given for amorphous Fe xAu0.8-xB0.2 films and are compared to crystalline FeAu films. The amorphous alloys show a magnetic moment per Fe which is 10% to 25% less than in the crystalline alloys where Fe has the normal value of ≊%2.2μB. This decreases is attributed to boron and comparable to the decrease found in amorphous FeB. The Hall effect as given by the Hall conductivity Rs/ρ2 is about the same value [∼0.03 (Ω cm G)-1] in both the crystalline and amorphous systems for higher Fe concentrations x≳0.62. As Fe becomes more dilute the Hall conductivity drops to about 0.02 (Ω cm G)-1. The anisotropic magnetoresistance Δρ at room temperature has a maximum value of Δp≊0.57×1006 Ω cm in amorphous FeAuB, about 30% higher than in the crystalline alloy. In general, however, the galvanomagnetic properties seem to be insensitive to the structure of the alloys.