Open Access Nano Express

Sputter-prepared (001) BiFeO3 thin films with ferromagnetic L10-FePt(001) electrode on glass substrates

Huang-Wei Chang1*, Fu-Te Yuan2, Chih-Wei Shih3, Ching-Shun Ku4, Ping-Han Chen1, Chang-Ren Wang1, Wen-Cheng Chang3, Shien-Uang Jen5 and Hsin-Yi Lee4

Author Affiliations

1 Department of Physics, Tunghai University, Taichung, 407, Taiwan

2 Department of Physics, National Taiwan University, Taipei, 106, Taiwan

3 Department of Physics, National Chung Cheng University, Chia-Yi, 621, Taiwan

4 National Synchrotron Radiation Research Center, Hsinchu, 300, Taiwan

5 Institute of Physics, Academia Sinica, Taipei, 115, Taiwan

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Nanoscale Research Letters 2012, 7:435  doi:10.1186/1556-276X-7-435

Published: 3 August 2012

Abstract

Highly textured BiFeO3(001) films were formed on L10-FePt(001) bottom electrodes on glass substrates by sputtering at reduced temperature of 400°C. Good electric polarization 2Pr = 80 and 95 μC/cm2, comparable to that of the reported epitaxial films, and coercivity Ec = 415 and 435 kV/cm are achieved in the samples with 20-nm- and 30-nm-thick electrodes. The BiFeO3(001) films show different degrees of compressive strain. The relation between the variations of strain and 2Pr suggests that the enhancement of 2Pr resulted from the strain-induced rotation of spontaneous polarization. The presented results open possibilities for the applications based on electric-magnetic interactions.

Keywords:
Multiferroic BiFeO3 (001) films; L10-FePt(001) underlayer; Glass substrate