Página Inicial CNEA Laboratorio TANDAR Página Inicial TANDAR Historia del acelerador TANDAR Web interno Web mail
Inicio » Actividades I+D > Publicaciones 2012 > Fe/MnAs bilayers: Magnetic anisotropy an...
acta de conferencia
"Fe/MnAs bilayers: Magnetic anisotropy and the role of the interface"
G. Alejandro, J. Milano, L.B. Steren, J.E. Gayone, M. Eddrief and V.H. Etgens
Proc. of the "Frontiers of Condensed Matter V" (FCM 2010), Buenos Aires, Argentina, December 6-10, 2010. Ed. A.M. Llois and J.Guevara
Physica B Condens. Matter. 407(16) (2012) 3161-3164
We have studied different aspects of the magnetic behavior of Fe(5 nm)/MnAs(100 nm) bilayers epitaxially grown on GaAs(1 0 0). Ferromagnetic resonance (FMR) measurements were performed in order to characterize the magnetic anisotropies of the films and the interlayer coupling between them. The chemical composition of the interface was investigated by X-ray photoemission spectroscopy (XPS). The iron layer FMR spectrum is highly temperature dependent between 280 K and 320 K as its parameters are strongly altered in the α/β phase coexistence regime of the MnAs layer, revealing a strong interlayer coupling in this T-region. Additionally, the XPS experiments demonstrate the existence of an Fe-MnAs intermixed interface. This result would explain the appearance of an additional uniaxial anisotropy in the plane of the Fe films, together with a strong reduction in its magnetocrystalline anisotropy and a negligible direct exchange coupling in the MnAs ferromagnetic state.
Av. Gral Paz y Constituyentes, San Martín, Pcia. de Buenos Aires, Argentina
Tel: (54-11) 6772-7007 - Fax: (54-11) 6772-7121