Giant Magnetostriction and Magnetic Anisotropy of Fe_2TiO_4

概要

論文の詳細を見る
The crystal distortion of a single crystal of Fe_2TiO_4 has been studied as a function of temperature (77°K to 300°K), magnetic field (up to 30kOe) and field direction, by means of strain gauge as well as X-ray analysis. The distortion is close to tetragonal with tetragonality of (c-a)/a=7.1±0.4×10^<-3> at 77°K. The distortion is found to be due to the magnetostriction with λ_<100>=4.7±0.3×10^<-3> and λ_<111>=1.3±0.4×10^<-3>. The magnetoelastic coupling constant B_1 is determined to be 520cm^<-1> per molecule. The crystal elongates in the field direction only when the field is applied in the [100] direction. The saturated values of the distortion at 30 kOe are about 70% of the intrinsic distortion in zero field. These phenomena have been explained by assuming the canted spin structure, the cubic anisotropy due to the magnetostriction and the uniaxial anisotropy originated from the internal stress. The cubic anisotropy constant K_1 of the ferromagnetic component is 5.8×10^5erg/cc at 77°K.
1971-08-05