To investigate the magnetic anisotropy of the antiferromagnet, pseudo-single crystalline Ni-Fe/Mn82Ni18 bilayers were fabricated on MgO single crystal substrate by changing the crystallographic orientation, such as (110), (001), and (111) parallel to the film plane. According to the simple exchange anisotropy model proposed by Meiklejohn and Bean, the magnetic torque curves were analyzed for the bilayer whose antiferromagnetic layer thickness is less than the critical value to induce the exchange bias field. As results, we found that the magnetic anisotropy of the antiferromagnetic layer has strong correlation with the crystallographic symmetry in the film plane, i.e. the two-, four-, and six-fold symmetry in a (110), (001), and (111) oriented bilayer, respectively. The anisotropy energy of Mn82Ni18 determined from the saturation torque amplitude was 3.2 × 105 erg/cm3 in (110), 1.4 × 104 erg/cm3 in (001), and 7 × 103 erg/cm3 in (111) orientation, respectively.
|Number of pages||9|
|Journal||Physica Status Solidi (A) Applied Research|
|Publication status||Published - 2002 Feb 1|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics