Ferromagnetism at Room Temperature Induced by Spin Structure Change in BiFe1-x Cox O3 Thin Films

Hajime Hojo; Ryo Kawabe; Keisuke Shimizu; Hajime Yamamoto; Ko Mibu; Kartik Samanta; Tanusri Saha-Dasgupta; Masaki Azuma

doi:10.1002/adma.201603131

Ferromagnetism at Room Temperature Induced by Spin Structure Change in BiFe_1-_x Co_x O₃ Thin Films

Adv Mater. 2017 Mar;29(9). doi: 10.1002/adma.201603131. Epub 2016 Dec 21.

Authors

Hajime Hojo¹, Ryo Kawabe¹, Keisuke Shimizu¹, Hajime Yamamoto¹, Ko Mibu², Kartik Samanta³, Tanusri Saha-Dasgupta³, Masaki Azuma¹

Affiliations

¹ Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama, 226-8503, Japan.
² Graduate School of Engineering, Nagoya Institute of Technology, Nagoya, 466-8555, Japan.
³ Department of Condensed Matter Physics and Materials Science, S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake, Kolkata, 700106, India.

PMID: 28000301
DOI: 10.1002/adma.201603131

Abstract

The coexistence and coupling of ferromagnetic and ferroelectric orders in a single material is crucial for realizing next-generation multifunctional applications. The coexistence of such orders is confirmed at room temperature in epitaxial thin films of BiFe_1-_x Co_x O₃ (x ≤ 0.15), which manifests a spin structure change from a low-temperature cycloidal one to a high-temperature collinear one with canted ferromagnetism.

Keywords: bismuth ferrite; epitaxial thin films; multiferroic materials; spin structure change; weak ferromagnetism.