DocumentCode :
967404
Title :
Photomagnetic and time effects in57Fe NMR in YFeO3
Author :
Nadolski, Stefan
Author_Institution :
Polish Academy of Sciences, Warsaw, Poland
Volume :
14
Issue :
5
fYear :
1978
fDate :
9/1/1978 12:00:00 AM
Firstpage :
912
Lastpage :
914
Abstract :
Two types of photomagnetic effects were found in YFeO3 by NMR method. At 
K there exist the relaxation effect involving the change of domain wall thickness caused by the wall\´s displacement. The illumination of the sample shortens the recovery time. The above effect depends on the domain wall position and is reversible. At helium temperatures irradiation of the sample lowers the enhancement factor. This process is irreversible and does not depend on domain wall position. All the above effects disappear after annealing the sample in a hydrogen atmosphere. This fact suggests, that relaxation processes are connected with the presence of Fe4+ions.
K there exist the relaxation effect involving the change of domain wall thickness caused by the wall\´s displacement. The illumination of the sample shortens the recovery time. The above effect depends on the domain wall position and is reversible. At helium temperatures irradiation of the sample lowers the enhancement factor. This process is irreversible and does not depend on domain wall position. All the above effects disappear after annealing the sample in a hydrogen atmosphere. This fact suggests, that relaxation processes are connected with the presence of Fe4+ions.Keywords :
Antiferromagnetic materials/devices; Ferrites; Magnetic domains; Magnetic thermal factors; Magnetooptic measurements; Nuclear magnetic resonance; Relaxation processes; Frequency; Helium; Lighting; Magnetic domain walls; Magnetic field measurement; Magnetic properties; Magnetooptic effects; Nuclear magnetic resonance; Temperature; Yttrium;
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/TMAG.1978.1059935
Filename :
1059935
Link To Document :
