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artículo con referato
"Magnetic dead layer in ferromagnetic manganite nanoparticles"
J. Curiale, M. Granada, H.E. Troiani, R.D. Sánchez, A.G. Leyva, P. Levy and K. Samwer
Appl. Phys. Lett. 95(4) (2009) 043106/1-3
We present experimental evidence on the physical origin of a magnetic dead layer (MDL) in manganite nanoparticles. The studied nanoparticles constitute the wall of La0.67Sr0.33MnO3 and La0.67Ca0.33MnO3 manganite nanotubes. Magnetic properties analysis and high resolution transmission electron microscopy show a shell of approximately 2 nm thickness with different properties from the core. In this shell the atoms are in a noncrystalline array that perfectly explains the 50% reduction of the magnetization compared to the bulk. Moreover, we present experimental evidence that the internal magnetic structure of the MDL is constituted by small ferromagnetic clusters in a frustrated configuration.
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