ABSTRACT
This chapter presents experimental data for the equilibrium magnetisation of the magnetic fluid and compared with the appropriate data for ferromagnetic suspensions (FS) produced by the procedure. The force effect of a heterogeneous magnetic field on the FS is represented by the effect of remanent magnetisation. An important problem in the applied aspect is the problem of the magnetic ageing of the material based on a decrease of remanent magnetisation and variation of its main magnetic parameters with time. A completely different behaviour in the process of static magnetisation is observed for a magnetic fluid sample which becomes completely demagnetised without any external effect of the field is switched off. The magnetic weighing equipment is based on measuring the force acting on the investigated sample in a heterogeneous magnetic field. The investigated ferrosuspension was produced by through mixing of F-600 ferrite powder with castor oil.
