J. Phys. Colloques
Volume 43, Number C7, Décembre 1982Conférence Internationale sur l'Impact des Neutrons Polarisés sur la Chimie et la Physique de l'Etat Solide / The Impact of Polarised Neutrons on Solid-State Chemistry and Physics
|Page(s)||C7-63 - C7-63|
J. Phys. Colloques 43 (1982) C7-63-C7-63
THREE DIMENSIONAL NEUTRON POLARIZATION ANALYSIS IN THE STUDY OF FERROMAGNETIC DOMAIN STRUCTURESM.Th. Rekveldt, W.H. Kraan et J.J. van Loef
Interuniversitair Reactor Instituut, 2629 JB Delft, The Netherlands
Neutron depolarization experiments have been carried out in which a polarized neutron beam is presented to a sample in either one of the three possible orthogonal polarization directions. Three dimensional polarization analysis of the transmitted beam yields a (3 x 3) depolarization matrix of the sample under investigation. In studying domain structures (DS) various models can be used to describe the D.S. in a limited number of parameters. From the measured depolarization matrix in general 6 independent domain parameters can be determined as a function of magnetic field, temperature, time, stress or other parameters. Various applications of this technique in the study of static and dynamic magnetization processes will be discussed. In particular attention will be given to studies of the amplitude of 90° zigzag walls in a Fe Si-single crystal /1/ and of the domain structure in amorphous Metglas 2826 /2/. As a result of the last it appears possible to analyse the internal mechanical stress distribution as a function of the depth in the foil.