Magnetic properties and synthesis of high i H c Sm-Ti-Fe

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Abstract
The room‐temperature intrinsic coercive force, iHc, of the hard Sm‐Ti‐Fe phase observed in film samples has been measured as a function of composition. The maximum iHc observed at room temperature was 38.5 kOe for a composition Sm19Fe73Ti8. Such samples were first made amorphous and then subsequently crystallized with an in‐plane magnetic field, Hs, applied. Tentative tetragonal lattice parameters have been assigned to this phase based on a fitting of 30 x‐ray lines between 30° and 80° 2θ for Cu radiation. The fitted tetragonal parameters are a=8.403 Å and c=12.401 Å. This high iHc Sm‐Ti‐Fe phase has not been observed in films that were directly crystallized onto heated substrates. The ferromagnetic Fe‐rich phases in Sm‐Ti‐Fe samples have been synthesized by rf sputtering films onto heated as well as room‐temperature substrates. The samples synthesized onto heated substrates were crystallized directly upon deposition, while the samples deposited onto room‐temperature substrates were amorphous and were then subsequently crystallized. An in‐the‐film‐plane magnetic field, Hs, was applied during the deposition as well as during the subsequent crystallization of amorphous film.