Exchange bias with Fe substitution in LaMnO3
Department of Solid State Physics and Center for Advanced Materials, Indian Association for the Cultivation of Science, Jadavpur, Kolkata, 700 032, India
Corresponding author: a firstname.lastname@example.org
Revised: 1 August 2007
Published online: 22 September 2007
We observe the negative shift of the magnetic hysteresis loop at 5 K, while the sample is cooled in external magnetic field in case of 30% of Fe substitution in LaMnO3. The negative shift and training effect of the hysteresis loops indicate the phenomenon of exchange bias. The cooling field dependence of the negative shift increases with the cooling field below 7.0 kOe and then, decreases with further increase of cooling field. The temperature dependence of the negative shift of the hysteresis loops exhibits that the negative shift decreases sharply with increasing temperature and vanishes above 20 K. Temperature dependence of dc magnetization and ac susceptibility measurements show a sharp peak (Tp) at 51 K and a shoulder (Tf) around 20 K. The relaxation of magnetization shows the ferromagnetic and glassy magnetic components in the relaxation process, which is in consistent with the cluster-glass compound.
PACS: 75.47.Lx – Manganites / 75.50.Lk – Spin glasses and other random magnets / 75.30.Gw – Magnetic anisotropy
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2007