AN ORIGINAL DEVICE FOR OBSERVATIONS IN LORENTZ HVEM

Special stages have been used over many years for the study of magneti c domains and walls in ferromagnetics. The new stage described here al lows direct observations of the interaction between structural defects and magnetic domain walls. With this new version, built in CEMES LOE in Toulouse, accurate measurements of microscopic hysteresis loops can be made, according to the very low beam deflection when applying vari able external magnetic fields. Another advantage of the stage is the f easibility of very-low-temperature measurements (at 4 K). Experimental results are given on interaction between structural defects (grain bo undaries) and magnetic domain walls at room temperature in a crystalli ne Fe-Si alloy.