화학공학소재연구정보센터
Applied Surface Science, Vol.292, 400-404, 2014
FePtAg-C nanogranular film for ultrahigh density magnetic recording media
A FePtAg-C nanogranular film was studied for ultrahigh density perpendicular recording media with the density of 1 Tbits/in(2) or even higher because of the strong anisotropy at FePt L1(0)-phase. In experiments, a Fe47Pt42Ag11-C45% (6.6 nm) film was deposited on a silicon substrate with a MgO (12 nm) interlayer at 500 degrees C. The perpendicular coercivity of the film is 34 k0e, with a unit squareness. Bright-field TEM images show that the FePtAg-C nanogranular film has small and uniform grains of 6.8 +/- 1.6 nm. More work of high-resolution TEM imaging shows excellent L1(0)-ordering for this film, consistent with the texture measurement by XRD. The measurement of remnant coercivity proves that it has an energy barrier of 310 k(B)T at room temperature, meaning excellent thermal stability. As a result, FePtAg-C nanogranular film is a qualified candidate for high-density magnetic recording media. (C) 2013 Elsevier B.V. All rights reserved.