Exchange bias and interface electronic structure in Ni/Co3O4(011)

Details Exchange bias and interface electronic structure in Ni/Co3O4(011) Exchange bias and interface electronic structure in Ni/Co3O4(011)

2010-03-12

arxiv.org/abs/1003.2478v1

Physical Review B 81:104428, 2010

Physics

Condensed Matter

Materials Science

8 pages, 6 figures. Accepted for publication in Physical Review B.

Scientific paper

10.1103/PhysRevB.81.104428

A detailed study of the exchange bias effect and the interfacial electronic structure in Ni/Co3O4(011) is reported. Large exchange anisotropies are observed at low temperatures, and the exchange bias effect persists to temperatures well above the Neel temperature of bulk Co3O4, of about 40 K: to ~80 K for Ni films deposited on well ordered oxide surfaces, and ~150 K for Ni films deposited on rougher Co3O4 surfaces. Photoelectron spectroscopy measurements as a function of Ni thickness show that Co reduction and Ni oxidation occur over an extended interfacial region. We conclude that the exchange bias observed in Ni/Co3O4, and in similar ferromagnetic metallic/Co3O4 systems, is not intrinsic to Co3O4 but rather due to the formation of CoO at the interface.

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