S. A. Pud, V. F. Kovalenko, M. V. Petrichuk, “Enhancement of the magnetoresistive effect in nanocomposites based on manganite La$_{0.67}$Sr$_{0.33}$MnO$_3$ and magnetite Fe$_3$O$_4$”, Zhurnal Tekhnicheskoi Fiziki, 2010, Volume 80, Issue 4,Pages 89

This article is cited in 2 papers

Solid-State Electronics

Enhancement of the magnetoresistive effect in nanocomposites based on manganite La$_{0.67}$Sr$_{0.33}$MnO$_3$ and magnetite Fe$_3$O$_4$

S. A. Pud, V. F. Kovalenko, M. V. Petrichuk

National Taras Shevchenko University of Kyiv

Abstract: The effect of a magnetite Fe$_3$O$_4$ nanopowder in a nanocomposite with manganite La$_{0.67}$Sr$_{0.33}$MnO$_3$ on its magnetoresistive effect and conductivity is studied. The addition of a magnetite nanopowder to the initial material leads to a substantial (twofold) increase in the low-field magnetoresistive effect. The low-field magnetoresistive effect in substituted lanthanum manganite nanopowders is based on spin-dependent electron tunneling through grain boundaries. The transport mechanisms in such systems are analyzed, and noise spectroscopy is also used for this purpose.

Received: 30.10.2008
Accepted: 20.06.2009