https://doi.org/10.1007/s100510050282
Effective magnetic anisotropy of nanocrystalline Nd-Fe-Ti-N hard magnetic alloys
1
National Laboratory of Solid State
Microstructures and Institute of Solid State Physics, Department of
Physics, Nanjing University, Nanjing 210093, China
2
Department of Material Science and Engineering,
Nanjing University of Science and Technology,
Nanjing
210094, China
Corresponding author: a ufp@nju.edu.cn
Received:
28
October
1996
Revised:
14
March
1997
Accepted:
8
August
1997
Published online: 15 May 1998
The intermetallic compound Nd-Fe-Ti-N has been successfully
synthesized by a mechanical
alloying process. The structure and magnetic properties
of the sample have been
studied using X-ray diffraction and magnetic measurements.
It is found that
alloy exhibits a nanocrystalline ThMn12-type
tetragonal structure with
lattice parameters of a=0.8723 nm and c=0.4896 nm.
The saturation magnetization MS
and effective magnetic anisotropy Keff of the compound have been determined by
investigating magnetization processes. The calculated results based on the
law of approach
to magnetic saturation have been successfully used to determine
the constant Keff. The
difference between observed and calculated values in
magnetization is lower than 3%.
Of all terms in the law of approach to saturation, it is the 
term, which is attributed more to
non-compensated anisotropy energy, that has the prevailing effect for the compound. The
absorption of nitrogen is found to increase unit cell volume, MS
and Keff.
PACS: 75.50.Bb – Fe and its alloys / 75.60.-d – Domain effects, magnetization curves, and hysteresis
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 1998
