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Magnetic properties of DyCo5 and YCo5 amorphous alloys

AuthorsBlanco-Roldán, C.; Hierro-Rodríguez, A. ; Díaz, Javier; Valdés-Bango, F. ; Teixeira, J. M.; Quirós, Carlos ; Alameda, J. M.
Issue Date2015
CitationICM 2015
AbstractMagnetic properties of 35 nm thick DyCo5 and YCo5 amorphous films have been studied from room temperature down to 5K by Vibrating Sample Magnetometry (VSM, 9T), Superconducting Quantum Interference Device (SQUID, 6T), and X‐ray Magnetic Circular Dichroism (XMCD, 6T) at BOREAS beamline in Alba Synchrotron Light Facility. Two DyCo5 samples have been prepared with different magnetic properties. First sample, denoted DyCoC, is obtained by simultaneous co‐sputtering of Dy and Co targets. Second sample is a multilayer, denoted DyCoM, obtained by alternating ultrathin pure Dy and Co layers, with thicknesses adjusted around a monolayer to give a similar average composition and total thickness than the first sample, but with a different local atomic environment. The same procedure has been applied to prepare two reference YCo5 samples. Magnetometry measurements with in‐plane and out-­of-­ plane applied magnetic fields indicate that DyCo films have perpendicular magnetic anisotropy (PMA) and show a ferrimagnetic behavior. However, there are differences between both samples in compensation temperature, which is 120 K for DyCoC and 90 K for DyCoM, and out‐of-plane coercive fields, being magnetically softer the DyCoC film. On the contrary, reference YCo5 films have in‐plane anisotropy. As YCo5 and DyCo5 are similar from the structural and chemical point of view, this indicates that there is no contribution of Co atoms to the PMA observed in the DyCo5 films. Finally, XMCD element selective hysteresis loops, acquired at photon energies corresponding to Co L3 and Dy M5 absorption edges, have been used to study the temperature evolution of the magnetic cones characteristic of sperimagnetic alloys.
DescriptionResumen del póster presentado a la 20th International Conference on Magnetism, celebrada en Barcelona (España) del 5 al 10 de julio de 2015.-- et al.
Appears in Collections:(CINN) Comunicaciones congresos
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