Magnetic and magnetostrictive properties in amorphous (Tb0.27Dy0.73)(Fe1-xCox)2 films

Magnetic and magnetostrictive properties have been investigated for amorphous (Tb0.27Dy0.73)(FexCo1-x)2 thin films. An increase in the 3d magnetic moment and Curie temperatures higher than 550 K due to the enhancement of T-T interactions (T = transition metal) in substituted (Fe, Co) alloys were found. A well defined in-plane anisotropy is created by magnetic field annealing for the Co-rich films. A large magnetostriction of 480×10-6 was developed in 1.8 T magnetic field and 350×10-6 in low fields of 0.06 T for films with x = 0.47 after magnetic field annealing. The differing roles of Fe and Co atoms in the magnetization process have also been investigated.

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