By Topic

Structure, properties, and thermal stability of nanocrystallite Fe-Ti-N soft magnetic films

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

8 Author(s)
Li, D. ; Dept. of Mater. Phys., Univ. of Sci. & Technol. Beijing, China ; You-Song Gu ; Xiang-Rong Chang ; Fu-Shen Li
more authors

We deposited Fe-Ti-N magnetic films with a high sputtering power of 7 W/cm2. When the composition of the films was in the range of Fe-Ti(3.9 at.%)-N(8.8 at.%) to Fe-Ti(3.3 at.%)-N(13.5 at.%), the films were composed of α' and Ti2N precipitates. With the addition of nitrogen, 4πMs became higher than that of pure iron, reaching a maximum of 23.8 kG. At the same time, Hc was reduced to a minimum of 1.12 Oe. The best films can meet the needs of the recording head in dual-element giant magnetoresistive/inductive heads, yielding high storage density (10 Gb/in2). The incorporation of N in α-Fe brought about the α' phase with its higher saturation magnetization. Ti additions inhibited the equilibrium decomposition α'→α+γ'. Because HCD∝D6, where D is average grain diameter, grain size control is very important. The nitrogen induces severe distortion of the α' lattice, which can cause the grains to break into pieces and reduce the grain size. High sputtering power also led to the formation of fine grains, with diameter in the order of 14 nm. Probably Ti2N is preferentially precipitated on the grain boundary, pinning the grain boundary and stabilizing the grain size during high-temperature heat treatment. The temperature limit for stability of the structure and its associated low coercivity was not less than 520°C.

Published in:

Magnetics, IEEE Transactions on  (Volume:39 ,  Issue: 6 )