Ferromagnetic behavior and exchange bias effect in akaganeite nanorods

Journal Article · Mon May 04 00:00:00 EDT 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4918930· OSTI ID:22399025

Tadic, Marin ^[1]; Milosevic, Irena; Motte, Laurence ^[2]; Kralj, Slavko ^[3]; Saboungi, Marie-Louise ^[4]

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1. Condensed Matter Physics Laboratory, Vinca Institute of Nuclear Science, University of Belgrade, P.O. Box 522, 11001 Belgrade (Serbia)
2. Laboratoire CSPBAT, UMR 7244 CNRS Université Paris 13, 93017 Bobigny Cedex (France)
3. Department for Materials Synthesis, Jožef Stefan Institute, Jamova 39, 1000 Ljubljana (Slovenia)
4. CNRS, University of Orleans, F-45071 Orleans 2 (France)

We report ferromagnetic-like properties and exchange bias effect in akaganeite (β-FeOOH) nanorods. They exhibit a Néel temperature T{sub N} = 259 K and ferromagnetic-like hysteresis behavior both below and above T{sub N}. An exchange bias effect is observed below T{sub N} and represents an interesting behavior for akaganeite nanorods. These results are explained on the basis of a core-shell structure in which the core has bulk akaganeite magnetic properties (i.e., antiferromagnetic ordering) while the shell exhibits a disordered spin state. Thus, the nanorods show ferromagnetic properties and an exchange bias effect at the same time, increasing their potential for use in practical applications.

• OSTI ID: 22399025
• Journal Information: Applied Physics Letters, Vol. 106, Issue 18; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANTIFERROMAGNETISM
FERROMAGNETIC MATERIALS
FERROMAGNETISM
HYSTERESIS
IRON HYDROXIDES
IRON OXIDES
MAGNETIC PROPERTIES
NANOSTRUCTURES
NEEL TEMPERATURE
SPIN