An analysis was made of point-defect induced magnetic after-effect processes in

as-grown monocrystalline titano-magnetite (Fe2.8-DTi0.2O4) containing B-site

vacancies (D < 0.005). In a previous experiment these processes, near to 450, 200

and 65K, were completely recovered in the course of systematic annealing up to

1200K. Analysis of respective annealing kinetics suggested their association with

vacancy- (450K) and interstitial-based (200K) defect reorientations, including

modified electron hopping (65K). The present study was performed in order to

check the previously developed relaxation model by low-temperature (80K)

electron irradiation of the pre-recovered crystal and investigating whether the

point-defect relaxation of the initial as-grown state could be reconstituted.

Magnetic after-effect analyses, based upon systematic sample annealing at 80 to

1200K proved radiation-induced reproduction of related processes. Partial

modifications of respective process genealogies may be conveniently assigned to

the alternative techniques of defect induction, i.e. high-temperature crystal growth

in thermal equilibrium or out-of-equilibrium, low-temperature e--irradiation.

Impact of Irradiation-Induced Point Defects on Electronically and Ionically

Induced Magnetic Relaxation Mechanisms in Titano-Magnetites. F.Walz,

V.A.M.Brabers, H.Kronmüller: Physica Status Solidi A, 2008, 205[12], 2934-42