Room temperature ferromagnetism in nanoparticle assembled nanotubes

J.CURIALE; R.D. SANCHEZ; H.TROIANI; A.G.LEYVA; PABLO EDUARDO LEVY

Applied Physics Letters

American Institute of Physics

Año: 2005 vol. 87 p. 4311 - 4311

0003-6951

Room-temperature ferromagnetism in La2/3Sr1/3MnO3 nanoparticle assembled nanotubes, J. Curiale, R. D. Sánchez, H. E. Troiani, A. G. Leyva and P. Levy, Received 1 February 2005; accepted 7 June 2005; published online 21 July 2005. 2/3Sr1/3MnO3 nanoparticle assembled nanotubes, J. Curiale, R. D. Sánchez, H. E. Troiani, A. G. Leyva and P. Levy, Received 1 February 2005; accepted 7 June 2005; published online 21 July 2005. We present magnetic and transmission electron microscopy experiments on the double-exchange compound La2/3Sr1/3MnO3, nanostructured to form tubes with 700 nm of external diameter. Microscopy reveals that their walls are formed by a compact agglomerate of grains, whose sizes are around 20 nm. The study of magnetic properties of randomly oriented nanotubes shows that the transition from the ferromagnetic to paramagnetic state is at TC=320 K, close to the bulk sample value. They exhibit hysteresis in magnetic field loops. The coercive field at 90 K is around 130 Oe, and estimated single-domain size is around 20 nm. © 2005 American Institute of Physics. DOI: 10.1063/1.1999842 APPLIED PHYSICS LETTERS 87, 043113 (2005)