Journal
IEEE TRANSACTIONS ON MAGNETICS
Volume 37, Issue 4, Pages 1749-1754Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/20.950957
Keywords
magnetization dynamics; Ni-Fe alloys; rare-earth
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We show that the magnetization dynamics of soft ferromagnetic thin films can be tuned using rare-earth (RE) dopants. Low concentrations (2 to 10%) of Tb in 50 mn Ni-81 Fe-19 films are found to increase the Gilbert magnetic damping parameter a over two orders of magnitude without great effect on easy axis coercivity or saturation magnetization. Comparison with Gd dopants indicates that the orbital character of the Th moment is important for transferring magnetic energy to the lattice. Structural trans formations from the crystalline to the amorphous state, observed over the first 2%-10% of RE doping, may play a contributing but not sufficient role in damping in these films. The approach demonstrated here shows promise for adjusting the dynamical response, from underdamped to critically damped, in thin film materials for magnetic devices.
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