Observation of intriguing exchange bias in BiFeO 3 thin films

K. D. Sung; Y. A. Park; M. S. Seo; Y. Jo; N. Hur; J. H. Jung

doi:10.1063/1.4745887

Observation of intriguing exchange bias in BiFeO ₃ thin films

K. D. Sung, Y. A. Park, M. S. Seo, Y. Jo, N. Hur, J. H. Jung

Research output: Contribution to journal › Article › peer-review

14 Scopus citations

Abstract

We have reported an intriguing exchange bias in BiFeO ₃ thin films on SrTiO ₃ substrates. While the field cooling temperature (∼300 K) is far below the Néel temperature of BiFeO ₃ (∼640 K), we clearly observe the exchange bias (∼-225 Oe) at 10 K. The exchange bias becomes strong with lowering temperature and depends on the applied magnetic field direction during cooling, irrespective of crystallographic directions. Magnetic force microscopy measurements reveal the existence of a ferri/ferromagnetic material, probably γ-Fe ₂O ₃, at the grain boundary of antiferromagnetic BiFeO ₃, forming a core-shell like structure. Based on the uncompensated spins and strong anisotropy of antiferromagnetic layer, we have explained the observed exchange bias.

Original language	English
Article number	033915
Journal	Journal of Applied Physics
Volume	112
Issue number	3
DOIs	https://doi.org/10.1063/1.4745887
State	Published - Aug 2012

Bibliographical note

Funding Information:
This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2009-0067350).

Access to Document

10.1063/1.4745887

Cite this

@article{d050ec34896d49dd8b0eea237e6fe6b4,

title = "Observation of intriguing exchange bias in BiFeO 3 thin films",

abstract = "We have reported an intriguing exchange bias in BiFeO 3 thin films on SrTiO 3 substrates. While the field cooling temperature (∼300 K) is far below the N{\'e}el temperature of BiFeO 3 (∼640 K), we clearly observe the exchange bias (∼-225 Oe) at 10 K. The exchange bias becomes strong with lowering temperature and depends on the applied magnetic field direction during cooling, irrespective of crystallographic directions. Magnetic force microscopy measurements reveal the existence of a ferri/ferromagnetic material, probably γ-Fe 2O 3, at the grain boundary of antiferromagnetic BiFeO 3, forming a core-shell like structure. Based on the uncompensated spins and strong anisotropy of antiferromagnetic layer, we have explained the observed exchange bias.",

author = "Sung, {K. D.} and Park, {Y. A.} and Seo, {M. S.} and Y. Jo and N. Hur and Jung, {J. H.}",

note = "Funding Information: This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2009-0067350).",

year = "2012",

month = aug,

doi = "10.1063/1.4745887",

language = "English",

volume = "112",

journal = "Journal of Applied Physics",

issn = "0021-8979",

publisher = "American Institute of Physics",

number = "3",

}

TY - JOUR

T1 - Observation of intriguing exchange bias in BiFeO 3 thin films

AU - Sung, K. D.

AU - Park, Y. A.

AU - Seo, M. S.

AU - Jo, Y.

AU - Hur, N.

AU - Jung, J. H.

N1 - Funding Information: This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2009-0067350).

PY - 2012/8

Y1 - 2012/8

N2 - We have reported an intriguing exchange bias in BiFeO 3 thin films on SrTiO 3 substrates. While the field cooling temperature (∼300 K) is far below the Néel temperature of BiFeO 3 (∼640 K), we clearly observe the exchange bias (∼-225 Oe) at 10 K. The exchange bias becomes strong with lowering temperature and depends on the applied magnetic field direction during cooling, irrespective of crystallographic directions. Magnetic force microscopy measurements reveal the existence of a ferri/ferromagnetic material, probably γ-Fe 2O 3, at the grain boundary of antiferromagnetic BiFeO 3, forming a core-shell like structure. Based on the uncompensated spins and strong anisotropy of antiferromagnetic layer, we have explained the observed exchange bias.

AB - We have reported an intriguing exchange bias in BiFeO 3 thin films on SrTiO 3 substrates. While the field cooling temperature (∼300 K) is far below the Néel temperature of BiFeO 3 (∼640 K), we clearly observe the exchange bias (∼-225 Oe) at 10 K. The exchange bias becomes strong with lowering temperature and depends on the applied magnetic field direction during cooling, irrespective of crystallographic directions. Magnetic force microscopy measurements reveal the existence of a ferri/ferromagnetic material, probably γ-Fe 2O 3, at the grain boundary of antiferromagnetic BiFeO 3, forming a core-shell like structure. Based on the uncompensated spins and strong anisotropy of antiferromagnetic layer, we have explained the observed exchange bias.

UR - http://www.scopus.com/inward/record.url?scp=84865207003&partnerID=8YFLogxK

U2 - 10.1063/1.4745887

DO - 10.1063/1.4745887

M3 - Article

AN - SCOPUS:84865207003

SN - 0021-8979

VL - 112

JO - Journal of Applied Physics

JF - Journal of Applied Physics

IS - 3

M1 - 033915

ER -

Observation of intriguing exchange bias in BiFeO ₃ thin films

Abstract

Bibliographical note

Access to Document

Other files and links

Fingerprint

Cite this