Exchange Bias in Layered GdBaCo{sub 2}O{sub 5.5} Cobaltite
- Russian Academy of Sciences, M.N. Mikheev Institute of Metal Physics, Ural Branch (Russian Federation)
It is established that excess oxygen content δ influences the exchange bias (EB) in layered GdBa-Co{sub 2}O{sub 5+δ} cobaltite. The EB effect arises in p-type (δ > 0.5) cobaltite and disappears in n-type (δ < 0.5) cobaltite. The main parameters of EB in GdBaCo{sub 2}O{sub 5.52(2)} polycrystals are determined, including the field and temperature dependences of EB field H{sub EB}, blocking temperature T{sub B}, exchange coupling energy J{sub i} of antiferromagnet–ferromagnet (AFM–FM) interface, and dimensions of FM clusters. The training effect inherent in systems with EB has been studied. The results are explained in terms of exchange interaction between the FM and AFM phases. It is assumed that the EB originates from the coexistence of Co{sup 3+} and Co{sup 4+} ions that leads to the formation of monodomain FM clusters in the AFM matrix of cobaltite.
- OSTI ID:
- 22756160
- Journal Information:
- Journal of Experimental and Theoretical Physics, Journal Name: Journal of Experimental and Theoretical Physics Journal Issue: 6 Vol. 125; ISSN JTPHES; ISSN 1063-7761
- Country of Publication:
- United States
- Language:
- English
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