Ferroelectric-field-induced tuning of magnetism in the colossal magnetoresistive oxide La1ÀxSrxMnO3

Authors

X. Hong, University of Nebraska–LincolnFollow
A. Posadas, Yale University
A. Lin, Yale University
C. H. Ahn, Yale University

Date of this Version

2003

Document Type

Article

Citation

PHYSICAL REVIEW B 68, 134415

Comments

Used by permission.

Abstract

A ferroelectric field effect approach is presented for modulating magnetism in the colossal magnetoresistive oxide La_1-xSr_xMnO₃ (LSMO). The ferromagnetic Curie temperature of ultrathin LSMO films was shifted by 35 K reversibly using the polarization field of the ferroelectric oxide Pb(Zr_xTi_1-x)O₃ in a field effect structure. This shift was also observed in magnetoresistance measurements, with the maximum magnetoresistance ratio at 6 T increasing from 64% to 77%. This model system approach does not introduce substitutional disorder or structural distortion, demonstrating that regulating the carrier concentration alone changes the magnetic phase transition temperature and leads to colossal effects.