Role of interfacial structure on exchange-biased FeF<inf>2</inf> - Fe

J. Nogués, T. J. Moran, D. Lederman, Ivan K. Schuller, K. V. Rao, K. V. Rao

Research output: Contribution to journalArticleResearchpeer-review

150 Citations (Scopus)

Abstract

We have studied the effect of the interface structure on the exchange bias in the FeF2-Fe system, for FeF2 bulk single crystals or thin films. The exchange bias depends very strongly on the crystalline orientation of the antiferromagnet for both films and crystals. However, the interface roughness seems to have a strong effect mainly on the film systems. These results indicate that the exchange bias depends strongly on the spin structure at the interface, especially on the angle between the ferromagnetic and antiferromagnetic spins. We have also found a strong dependence of the hysteresis loops shape on the cooling field direction with respect to the antiferromagnetic anisotropy axis, induced by a rotation of the ferromagnetic easy axis as the sample is cooled through TN. For the single crystal systems the results imply the existence of a perpendicular coupling between the antiferromagnetic and ferromagnetic spins at low temperatures. © 1999 American Physical Society.
Original languageEnglish
Pages (from-to)6984-6993
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume59
Issue number10
DOIs
Publication statusPublished - 1 Jan 1999

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