RT Journal Article
T1 Thickness dependence of exchange coupling in epitaxial  Fe3 O4/ CoFe2 O4 soft/hard magnetic bilayers
A1 Lavorato, Gabriel Carlos
A1 Winkler, Elin L.
A1 Rivas Murias, Beatriz
A1 Rivadulla Fernández, José Francisco
K1 Condensed Matter
K1 Materials Physics
K1 Exchange interaction
K1 Spinel
K1 Bilayer films
K1 Multilayer thin films
K1 Oxides
AB Epitaxial magnetic heterostructures of (soft−)Fe3O4/(hard−)CoFe2O4(001) have been fabricated with a varying thicknesses of soft ferrite from 5 to 25 nm. We report a change in the regime of magnetic interaction between the layers from rigid-coupling to exchange-spring behavior, above a critical thickness of the soft magnetic Fe3O4 layer. We show that the symmetry and epitaxial matching between the spinel structures of CoFe2O4 and Fe3O4 at the interface stabilize the Verwey transition close to the bulk value even for 5-nm-thick Fe3O4. The large interface exchange-coupling constant estimated from low-temperature M(H) data confirmed the good quality of the ferrite-ferrite interface and the major role played by the interface in the magnetization dynamics. The results presented here constitute a model system for understanding the magnetic behavior of interfaces in core/shell nanoparticles and magnetic oxide-based spintronic devices
PB APS Physics
SN 2469-9950
YR 2016
FD 2016
LK http://hdl.handle.net/10347/17029
UL http://hdl.handle.net/10347/17029
LA eng
NO Lavorato, G., Winkler, E., Rivas-Murias, B., & Rivadulla, F. (2016). Thickness dependence of exchange coupling in epitaxial Fe3 O4/CoFe2 O4 soft/hard magnetic bilayers. Physical Review B, 94(5). doi: 10.1103/physrevb.94.054405
NO F.R. wants to acknowledge financial support from the MINECO-Spain (Project No. MAT2013-44673-R). B.R.-M. acknowledges support from Xunta de Galicia (Project No. EM2013/038). G.L. acknowledges the Bec. Ar Program for financial support. G.L. and E.W. thank ANPCyT through Grant No. PICT-2012-0492 and UNCuyo through Grant No. C011
DS Minerva
RD 26 abr 2026