HALL-EFFECT IN FE-CR-CO ALLOY THIN-FILMS

This paper presents the Hall effect and microstructure of Fe-XCr-10Co, Fe-XCr-Co (weight ratio W-Fe/W-Co = 1), and Fe-60Cr-XCo alloy films. After deposition by ion beam sputtering (BS), the Hall voltage (VH) an d Hall coefficient (RH) values of the as-deposited films were found to be small. After heat treatment, phase separation into eel (ferromagne tic phase) and alpha(2) (paramagnetic phase) was observed and verified by high resolution transmission electron microscope (HRTEM). By aging the Fe-60Cr-15Co films at 550 degrees C for 80 min, we found the maxi mum Hall resistivity (pH) and Hall voltage (VH) values which are 30 mu Omega-cm and 1.2mV, respectively (measured at 77 K and 14kOe). The ex traordinary Hall coefficient (R-S) is about 0.408 cm(3)/C. The Hall co efficient is positive for both as-deposited and annealed films. The al loy composition and heat treatment condition which influence film's mi crostructure obviously affect the Hall property.