Abstract
Giant magnetostrictive SmFe 2/Fe exchange-coupled multilayers were fabricated by ion beam sputtering deposition on glass substrates. The effects of SmFe 2/Fe exchange coupling action and vacuum annealing on soft-magnetic property and static-dynamic magnetostrictive characteristics of SmFe 2/Fe multilayers were investigated. The results showed that the soft-magnetic, static–dynamic magnetostrictive characteristics were greatly improved by SmFe 2/Fe exchange coupling action and proper vacuum annealing treatment temperature. Compared with that of SmFe 2 single film, the coercivity in the direction of easy magnetization axis for SmFe 2/Fe exchange-coupled multilayers exhibited a greater decrease. Better soft-magnetic properties were achieved ( H c =2.54 kA/m, M s =120.38 emu/g, and M r / M s =0.21) after vacuum annealing at certain temperature. The magnetostrictive coefficient for SmFe 2/Fe exchange-coupled multilayers was about 135 ppm at 16 kA/m magnetic field. At first order resonant frequency (99.2 Hz), the amplitude peak–peak value for the as-deposited SmFe 2/Fe exchange-coupled multilayers was 46 μm. After the vacuum annealing treatment at 250 °C, the amplitude peak–peak value increased to 650 μm.
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