Crystal-Orientation-Modulated Exchange Bias in Orthorhombic-YMnO3/La0.6Sr0.4MnO3 Multiferroic Heterostructures

Dongxing Zheng; Junlu Gong; Chao Jin; Peng Li; Haili Bai

doi:10.1021/acsami.5b02783

Crystal-Orientation-Modulated Exchange Bias in Orthorhombic-YMnO3/La0.6Sr0.4MnO3 Multiferroic Heterostructures

ACS Appl Mater Interfaces. 2015 Jul 15;7(27):14758-62. doi: 10.1021/acsami.5b02783. Epub 2015 Jun 29.

Authors

Dongxing Zheng¹, Junlu Gong¹, Chao Jin¹, Peng Li¹, Haili Bai¹

Affiliation

¹ Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology, Institute of Advanced Materials Physics, Faculty of Science, Tianjin University, Tianjin 300072, PR China.

PMID: 26083193
DOI: 10.1021/acsami.5b02783

Abstract

The magnetic properties of the all-oxide multiferroic heterostructures composed of orthorhombic YMnO3 (YMO) with E-type antiferromagnetic and double-exchange ferromagnetic (FM) La0.6Sr0.4MnO3 (LSMO) were studied. An orientation-modulated exchange bias effect, which is related to the interfacial Mn-O-Mn bond angle, was discovered. Because of the large bond angle in YMO/LSMO(100) heterostructures, a strong exchange coupling at the interface is formed. This strong exchange coupling sustains an FM phase in YMO at the interface region. The FM phase with strong magnetocrystalline anisotropy contributes to the vertical shift and exchange bias effect in (100) orientation heterostructures. When LSMO (110) and (111) were layered with YMO, the Mn-O-Mn bond angle was reduced, leading to a weakened exchange coupling at the interface, and only a relatively small exchange bias at low temperatures was visible.

Keywords: crystal orientation; double-exchange interaction; exchange bias; interfacial coupling; multiferroic heterostructures.

Publication types

Research Support, Non-U.S. Gov't