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Structural and Magnetic Properties in Annealed FePt-Bx (x = 0.05 and 0.33) Thin Films
Young-Min LEE,Chan-Gyu LEE,Bon-Heun KOO,Byeong-Seon LEE,Osamu Kitakami,Satoshi Okamoto,Takamichi Miyazaki,Yutaka Shimada 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.3
Multi-layer films of MgO20 nm/(FePt-Bx)50 nm/MgO20 nm were deposited on Si (100) substrates by RF magnetron sputtering. The B content (x) of the thin films was found to be about 5 and 33 at.% by using wavelength dispersive spectroscopy (WDX). In the (FePt)0.67B0.33 film an excess of B in the FePt film led to an amorphous structure in the as-deposited film, which changed to an ordered cubic structure on annealing. However, the (FePt)0.95B0.05 film started to show a phase transformation from the disordered fcc structure to the ordered L10 phase with an fct structure at 350 C and was remarkably transformed to a L10 structure at about 500 C on post-annealing. The maximum coercivities (Hc) of the (FePt)0.95B0.05 and the (FePt)0.67B0.33 films were found to be 9.1 and 2.9 kOe after annealing at 600 C for 1 hr, respectively.