Open AccessCALCULATION OF MAGNETIC SINGLE-ION ANISOTROPY AND THE MORIN TRANSITION IN HEMATITE
Author(s) -
Hua Li,
Jiang Shou-Ting,
Mei Liang-Mo,
Yuzheng Guo,
Yang Guei-Lin,
Xu You,
Hongru Zhai
Publication year - 1988
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.37.36
Subject(s) - hematite , anisotropy , ion , condensed matter physics , morin , materials science , dipole , magnetic anisotropy , magnetic field , physics , magnetization , quantum mechanics , medicine , pathology , metallurgy
A calculation of magnetic single-ion anisotropy in hematite (α-Fe2O3) has been made, based on point-charge model in crystalline field. The nearest-neighbor O2- ions and the nexi-nearest-neighbor Fe3+ ions were chosen as ligands and the effect of electrostatic shield provided by the O2- ions was taken into account. Considering the sixth order perturbation, we ob-tained an equivalent single-ion anisotropy field Hsi=102.3×102 Oe. Making use of this results in conjunction with the computed equivalent dipolar anisotropy field by Artmen et al,. the Morin transition temperature in hematite TM=261 K was obtained, which is in good agreement with the experimental value. Based on the linear approximation principle, we got the TM-n relation for low n value in α-(Fe-1nAln)2O3. With this relation the dependence of the-Morin transition temperature, TM, on n in low n value range could be explained quite well.