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Effect of Mn doping on the magnetic properties of the post‐annealed Fe 48 Pt 52 ‐C composite films
Author(s) -
Mi W. B.,
Jin J.,
Bai H. L.
Publication year - 2011
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201127051
Subject(s) - coercivity , materials science , tetragonal crystal system , doping , condensed matter physics , annealing (glass) , lattice constant , sputter deposition , ferromagnetism , lattice (music) , sputtering , analytical chemistry (journal) , nuclear magnetic resonance , thin film , crystallography , composite material , crystal structure , nanotechnology , optics , diffraction , chemistry , optoelectronics , physics , acoustics , chromatography
(Fe 48 Pt 52 ) 1– x Mn x ‐C composite films with different x were fabricated using magnetron sputtering and post‐annealing at 550 °C. Proper Mn doping can improve the ordering of the face‐centered tetragonal (fct) FePt grains. The lattice constant ratio ( c / a ) first decreases, then increases with the increasing x . At x = 2.1%, the minimum c / a of 0.964 and the maximum ordering degree of 0.96 were obtained. All of the films are hard ferromagnetic. The maximum room‐temperature coercivity of the films is 7.5 kOe at x = 2.1% and 10‐kOe field, and the coercivity decreases from 13.3 kOe at 20 K to 10.1 kOe at 300 K under a 90‐kOe field. The reversal mechanism of the films is the coexistence of the domain wall motion and Stoner–Wolhfarth (S‐W) rotation modes.