Magnetism of manganite nanotubes constituted by assembled nanoparticles

J. Curiale, R. D. Sánchez, H. E. Troiani, C. A. Ramos, H. Pastoriza, A. G. Leyva, and P. Levy
Phys. Rev. B 75, 224410 – Published 11 June 2007

Abstract

We present a study on the magnetic properties of manganite ultrafine grains assembled in nanotubes of 800nm of external diameter and 68μm length. The study includes two homogeneous ferromagnetic compounds, La0.67Ca0.33MnO3 and La0.67Sr0.33MnO3, and one exhibiting ferromagnetic and charge-ordered phase coexistence, La0.325Pr0.300Ca0.375MnO3. From magnetic measurements, we conclude that the grains behave as single magnetic domains. Observations of dipolar interactions between magnetic grains are evidenced by isothermal remanent magnetization and direct current demagnetization experiments. These experiments suggest that the grain magnetic moments should be arranged in a fanning configuration at H=0. Also, a uniaxial shape anisotropy was observed on previously aligned ferromagnetic nanotubes by ferromagnetic-resonance experiences. In La0.325Pr0.300Ca0.375MnO3, we observe distinctive features related to its inhomogeneous character as compared with the ferromagnetic homogeneous nanotubes.

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  • Received 7 July 2006

DOI:https://doi.org/10.1103/PhysRevB.75.224410

©2007 American Physical Society

Authors & Affiliations

J. Curiale, R. D. Sánchez*,†, H. E. Troiani, C. A. Ramos, and H. Pastoriza

  • Centro Atómico Bariloche (CNyN), Comisión Nacional de Energía Atómica and Instituto Balseiro, Universidad Nacional de Cuyo, 8400 San Carlos de Bariloche, Rio Negro, Argentina

A. G. Leyva and P. Levy

  • Centro Atómico Constituyentes (CNyN), Comisión Nacional de Energía Atómica, B1650KNA Buenos Aires, Argentina

  • *Corresponding author. Electronic address: rodo@cab.cnea.gov.ar
  • Also at Universidad Nacional de San Martín.
  • Also at CIC-CONICET.

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Issue

Vol. 75, Iss. 22 — 1 June 2007

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