INTECIN   20395
INSTITUTO DE TECNOLOGIAS Y CIENCIAS DE LA INGENIERIA "HILARIO FERNANDEZ LONG"
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Structural and magnetic properties of multilayers with CoFe2O4 as pinner layer
Autor/es:
PAMPILLO, L. G.; GRANELL, P.; F. D. SACCONE
Lugar:
Roma
Reunión:
Conferencia; 10th International Conference on Nanostructured Materials; 2010
Institución organizadora:
Consiglio Nazionale delle Ricerche
Resumen:
Multilayered films composed by two decoupled ferromagnetic thin layers separated by a non-magnetic (NM) spacer layer are the basic architecture of spin valve devices and magnetic random acces memories (MRAM). The decoupling can usually be obtained by different methods, one is the use of a synthetic antiferromagnet (such as CoFe2/Ru/ CoFe2). However, it was recently [1] proposed that the natural CoFe2O4 ferrimagnet is a suitable candidate for its use as pinner layer for these systems grown by pulsed laser deposition. We prepared CoFe2O4(340nm)/Fe(50nm)/NM/Fe(50nm) multilayered films (NM = AlOx, TiO2, Cu, ZnO) by pulsed laser deposition (Nd-YAG, λ= 355 nm). The films were grown on a Si substrate. The thickness of the NM spacer layer was near 5 nm. The structural properties of the samples were analized by X-ray diffraction and scanning electron microscopy. The hysteresis loops of CoFe2O4/Fe/AlOx/Fe exhibited a pronounced decoupling between free and pinned Fe layers, at room temperature inclusive. For TiO2 separator we found by ZFC measurement a wide maximum for the magnetization at around 200K, while for FC the maximum was wider and it was located around 150K. [1] T. Fix et al. Nanotech. 18 (2007) 495708.