Low-field magnetoresistance in tetragonalsfilms

J. O’Donnell, M. Onellion, M. Rzchowski, J. Eckstein, I. Bozovic

Research output: Contribution to journalArticle

Abstract

We have measured the low-field magnetoresistance of molecular-beam-epitaxy-grown tetragonal La0.7Ca0.3MnO3 films as a function of temperature, and both magnitude and direction of the applied magnetic field. We observed low-field anisotropic hysteresis that depends on the direction of the applied field in the plane of the film. The hysteretic effect can result in a sharp drop in resistance during magnetization reversal which is more than 10 times steeper than the already "colossal" magnetoresistance. We also present evidence of biaxial magnetocrystalline anisotropy with easy axes ong the Mn-O bond ([100],[010]) directions. We show that the low-field anisotropic hysteresis arises from the combined effects of magnetocrystalline anisotropy, anisotropic magnetoresistance, and "colossal" magnetoresistance. Based on a comparison of the data with a simple phenomenological model for the magnetoresistance, we argue that magnetization reversal must proceed by a domain process.

Original languageEnglish (US)
Pages (from-to)5873-5879
Number of pages7
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume55
Issue number9
DOIs
StatePublished - Jan 1 1997
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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