Exotic exchange bias at epitaxial ferroelectric-ferromagnetic interfaces

Amitesh Paul; Christoph Reitinger; Carmine Autieri; Biplab Sanyal; Wolfgang Kreuzpaintner; Jaru Jutimoosik; Rattikorn Yimnirun; Francis Bern; Pablo Esquinazi; Panagiotis Korelis; Peter Böni

doi:10.1063/1.4885316

Exotic exchange bias at epitaxial ferroelectric-ferromagnetic interfaces

Amitesh Paul, Christoph Reitinger, Carmine Autieri, Biplab Sanyal, Wolfgang Kreuzpaintner, Jaru Jutimoosik, Rattikorn Yimnirun, Francis Bern, Pablo Esquinazi, Panagiotis Korelis, Peter Böni

Natural Sciences

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

20 Scopus citations

Abstract

Multiferroics in spintronics have opened up opportunities for future technological developments, particularly in the field of ferroelectric (FE)-ferromagnetic (FM) oxide interfaces with functionalities. We find strong exchange bias shifts (up to 84 Oe) upon field cooling in metal-oxide (Fe/BaTiO₃) films combining FM and FE layers. The saturation magnetic moment of the FM layer is also significantly higher than in bulk (3.0 ± 0.2 μ_B/atom) and the reversal mechanism occurs via a domain nucleation process. X-ray absorption spectroscopy at the Fe K-edge and Ba L3-edge indicate presence of few monolayers of antiferromagnetic FeO at the interface without the formation of any BaFeO₃ layer. Polarized neutron reflectometry corroborates with our magnetization data as we perform depth profiling of the magnetic and structural densities in these bilayers. Our first principles density functional calculations support the formation of antiferromagnetic FeO layers at the interface along with an enhancement of Fe magnetic moments in the inner ferromagnetic layers.

Original language	English
Article number	022409
Journal	Applied Physics Letters
Volume	105
Issue number	2
DOIs	https://doi.org/10.1063/1.4885316
State	Published - 14 Jul 2014

Access to Document

10.1063/1.4885316

Cite this

@article{41916937a73c4b8981f4acd958eeef7b,

title = "Exotic exchange bias at epitaxial ferroelectric-ferromagnetic interfaces",

abstract = "Multiferroics in spintronics have opened up opportunities for future technological developments, particularly in the field of ferroelectric (FE)-ferromagnetic (FM) oxide interfaces with functionalities. We find strong exchange bias shifts (up to 84 Oe) upon field cooling in metal-oxide (Fe/BaTiO3) films combining FM and FE layers. The saturation magnetic moment of the FM layer is also significantly higher than in bulk (3.0 ± 0.2 μB/atom) and the reversal mechanism occurs via a domain nucleation process. X-ray absorption spectroscopy at the Fe K-edge and Ba L3-edge indicate presence of few monolayers of antiferromagnetic FeO at the interface without the formation of any BaFeO3 layer. Polarized neutron reflectometry corroborates with our magnetization data as we perform depth profiling of the magnetic and structural densities in these bilayers. Our first principles density functional calculations support the formation of antiferromagnetic FeO layers at the interface along with an enhancement of Fe magnetic moments in the inner ferromagnetic layers.",

author = "Amitesh Paul and Christoph Reitinger and Carmine Autieri and Biplab Sanyal and Wolfgang Kreuzpaintner and Jaru Jutimoosik and Rattikorn Yimnirun and Francis Bern and Pablo Esquinazi and Panagiotis Korelis and Peter B{\"o}ni",

year = "2014",

month = jul,

day = "14",

doi = "10.1063/1.4885316",

language = "English",

volume = "105",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics",

number = "2",

}

TY - JOUR

T1 - Exotic exchange bias at epitaxial ferroelectric-ferromagnetic interfaces

AU - Paul, Amitesh

AU - Reitinger, Christoph

AU - Autieri, Carmine

AU - Sanyal, Biplab

AU - Kreuzpaintner, Wolfgang

AU - Jutimoosik, Jaru

AU - Yimnirun, Rattikorn

AU - Bern, Francis

AU - Esquinazi, Pablo

AU - Korelis, Panagiotis

AU - Böni, Peter

PY - 2014/7/14

Y1 - 2014/7/14

N2 - Multiferroics in spintronics have opened up opportunities for future technological developments, particularly in the field of ferroelectric (FE)-ferromagnetic (FM) oxide interfaces with functionalities. We find strong exchange bias shifts (up to 84 Oe) upon field cooling in metal-oxide (Fe/BaTiO3) films combining FM and FE layers. The saturation magnetic moment of the FM layer is also significantly higher than in bulk (3.0 ± 0.2 μB/atom) and the reversal mechanism occurs via a domain nucleation process. X-ray absorption spectroscopy at the Fe K-edge and Ba L3-edge indicate presence of few monolayers of antiferromagnetic FeO at the interface without the formation of any BaFeO3 layer. Polarized neutron reflectometry corroborates with our magnetization data as we perform depth profiling of the magnetic and structural densities in these bilayers. Our first principles density functional calculations support the formation of antiferromagnetic FeO layers at the interface along with an enhancement of Fe magnetic moments in the inner ferromagnetic layers.

AB - Multiferroics in spintronics have opened up opportunities for future technological developments, particularly in the field of ferroelectric (FE)-ferromagnetic (FM) oxide interfaces with functionalities. We find strong exchange bias shifts (up to 84 Oe) upon field cooling in metal-oxide (Fe/BaTiO3) films combining FM and FE layers. The saturation magnetic moment of the FM layer is also significantly higher than in bulk (3.0 ± 0.2 μB/atom) and the reversal mechanism occurs via a domain nucleation process. X-ray absorption spectroscopy at the Fe K-edge and Ba L3-edge indicate presence of few monolayers of antiferromagnetic FeO at the interface without the formation of any BaFeO3 layer. Polarized neutron reflectometry corroborates with our magnetization data as we perform depth profiling of the magnetic and structural densities in these bilayers. Our first principles density functional calculations support the formation of antiferromagnetic FeO layers at the interface along with an enhancement of Fe magnetic moments in the inner ferromagnetic layers.

UR - http://www.scopus.com/inward/record.url?scp=84904726096&partnerID=8YFLogxK

U2 - 10.1063/1.4885316

DO - 10.1063/1.4885316

M3 - Article

AN - SCOPUS:84904726096

SN - 0003-6951

VL - 105

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 2

M1 - 022409

ER -

Exotic exchange bias at epitaxial ferroelectric-ferromagnetic interfaces

Abstract

Access to Document

Other files and links

Fingerprint

Cite this