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MA: Fachverband Magnetismus
MA 40: Poster Magnetism II
MA 40.18: Poster
Donnerstag, 30. März 2023, 14:00–16:00, P2/EG
Analysis of Exchange Bias training effect in Exchange coupled LaFeO3 /NiO nanocomposite — •Priyanka Sharma1 and Ratnamala Chatterjee2 — 1Indian Institute of Technology Delhi, New Delhi 110016, India — 2Indian Institute of Technology Delhi, New Delhi 110016, India
Existence of exchange bias (EB) resulting from antiferromagnetic/ferromagnetic interface is well known in the literature. EB phenomenon is characterized by the horizontal shift of the magnetic hysteresis loop as the system is cooled through Neel's temperature in presence of an external magnetic field. EB is the backbone of designing magnetic storage devices and is among the modern approaches to spintronics. One of the interesting characteristics of EB is the training effect [1]. In this work, we investigate the EB training effect (TE) in LaFeO3/NiO nanocomposite synthesized by a chemical route. The consecutive measurement of field cooled (60 kOe) magnetic hysteresis loops at 5 K show that the exchange bias field (HE) decreases with the increasing number of cycles of M-H loops (n) confirming the presence of the TE effect in our sample. The experimentally observed trend between HE and n was fitted using the power law and Binek's recursive relation. From the Binek's recursive relation, the obtained value of HE infinity (EB field in the limit of infinite loops) and γ (sample dependent constant) is 1118 Oe & 6.9X10^(-7) (Oe)-2, respectively. Both, the power law and Binek's recursive relation points coincide well with the experimental observations.
[1] C. Binek, Physical Review B 70 (1), 014421 (2004).