FERROMAGNETIC-RESONANCE STUDIES IN MNCOXSB ESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-0.25]

Ferromagnetic resonance (FMR) studies have been carried out on thin fi lms of MnCo(x)Sb system at room temperature (RT). Exchange coupling co nstant (A) and g-values have been evaluated from the observed spectra. They are found to decrease with increase of Co concentration. The str ain anisotropy field changes its sign at a concentration of x=0.18 ind icating the spin reorientation occurring in the system. The anisotropy fields calculated from the FMR in powder recorded at X-band and Q-ban d frequencies also confirm the occurrence of spin reorientation.