Magnetic behaviour of iron oxides

Most of the data for this section came from Murad and Johnston (1987), Murad (1988) and Coey (1988). The main type of magnetic interaction between Fe ions on adjacent sites in a solid is the electrostatic exchange interaction this tends to cause [Pg.121]

1) Remanent magnetization is the magnetization that remains after the magnetic field has been switched off. [Pg.121]

The magnetic properties of iron oxides can be determined using Mossbauer spectroscopy, neutron powder diffraction and magnetometry (see Chap. 7). The characteristic parameters are the magnetic moment, the permeability, the saturation magnetization, the magnetic anisotropy constants and the Bhf (Tab. 6.2). [Pg.122]

Oxide Temperature K Magnetic structure Saturation Magnetization 7s at 300 K Ptrr kg Anisotropy Constant Jm- Magneto- Restriction Constant Jl Magnetic hypeifine field Bhf 295 K 4 K [Pg.123]