Study of Nanostructured Array of Antidots Using Pulsed Magnetic Fields
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The absence of the superparamagnetic limit in nanostructured antidots makes them strong candidates for ultra-high density recording media. In this work, nanoporous alumina templates (NpATs), with average pore diameters ∼35 nm and separation ∼100 nm, were grown using a two-step anodization method. A Ni80Fe20 thin film of 6.5 nm was then sputtered on top of such NpATs, building an antidot network. A detailed study of the magnetoresistance (MR) (fields up to 25 T and temperatures down to 77 K) was performed. The antidot network sample revealed an anomalous MR and R(T) behaviour at T M ∼250 K arising from a spin-flip transition occurring in a thin iron oxide layer.
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- 2.D.C. Leitao, C.T. Sousa, J. Ventura, K.R. Pirota, M. Vazquez, J.B. Sousa, J.P. Araujo, J. Magn. Magn. Mater. doi: 10.1016/j.jmmm.2009.04.001
- 11.B.E. del Barco, M. Duran, J.M. Hernandez, J. Tejad, R.D. Zysler, M. Vasquez Mansilla, D. Fiorani, Phys. Rev. B 65, 05240 (2002) Google Scholar