Nanoscale switching characteristics of nearly tetragonal BiFeO3 thin films

Dipanjan Mazumdar; Vilas Shelke; Milko Iliev; Stephen Jesse; Amit Kumar; Sergei V. Kalinin; Arthur P. Baddorf; Arunava Gupta

doi:10.1021/nl101187a

Nanoscale switching characteristics of nearly tetragonal BiFeO₃ thin films

Dipanjan Mazumdar, Vilas Shelke, Milko Iliev, Stephen Jesse, Amit Kumar, Sergei V. Kalinin, Arthur P. Baddorf, Arunava Gupta

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

148 Scopus citations

Abstract

We have investigated the nanoscale switching properties of strain-engineered BiFeO₃ thin films deposited on LaAlO₃ substrates using a combination of scanning probe techniques. Polarized Raman spectral analysis indicates that the nearly tetragonal films have monoclinic (Cc) rather than P4mm tetragonal symmetry. Through local switching-spectroscopy measurements and piezoresponse force microscopy, we provide clear evidence of ferroelectric switching of the tetragonal phase, but the polarization direction, and therefore its switching, deviates strongly from the expected (001) tetragonal axis. We also demonstrate a large and reversible, electrically driven structural phase transition from the tetragonal to the rhombohedral polymorph in this material, which is promising for a plethora of applications.

Original language	English
Pages (from-to)	2555-2561
Number of pages	7
Journal	Nano Letters
Volume	10
Issue number	7
DOIs	https://doi.org/10.1021/nl101187a
State	Published - Jul 14 2010

Keywords

Ferroelectric tunnel junction
Ferroelectricity
Morphotropic phase transition
Multiferroics
Piezoresponse force microscopy
Spintronics

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10.1021/nl101187a

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title = "Nanoscale switching characteristics of nearly tetragonal BiFeO3 thin films",

abstract = "We have investigated the nanoscale switching properties of strain-engineered BiFeO3 thin films deposited on LaAlO3 substrates using a combination of scanning probe techniques. Polarized Raman spectral analysis indicates that the nearly tetragonal films have monoclinic (Cc) rather than P4mm tetragonal symmetry. Through local switching-spectroscopy measurements and piezoresponse force microscopy, we provide clear evidence of ferroelectric switching of the tetragonal phase, but the polarization direction, and therefore its switching, deviates strongly from the expected (001) tetragonal axis. We also demonstrate a large and reversible, electrically driven structural phase transition from the tetragonal to the rhombohedral polymorph in this material, which is promising for a plethora of applications.",

keywords = "Ferroelectric tunnel junction, Ferroelectricity, Morphotropic phase transition, Multiferroics, Piezoresponse force microscopy, Spintronics",

author = "Dipanjan Mazumdar and Vilas Shelke and Milko Iliev and Stephen Jesse and Amit Kumar and Kalinin, {Sergei V.} and Baddorf, {Arthur P.} and Arunava Gupta",

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T1 - Nanoscale switching characteristics of nearly tetragonal BiFeO3 thin films

AU - Mazumdar, Dipanjan

AU - Shelke, Vilas

AU - Iliev, Milko

AU - Jesse, Stephen

AU - Kumar, Amit

AU - Kalinin, Sergei V.

AU - Baddorf, Arthur P.

AU - Gupta, Arunava

PY - 2010/7/14

Y1 - 2010/7/14

N2 - We have investigated the nanoscale switching properties of strain-engineered BiFeO3 thin films deposited on LaAlO3 substrates using a combination of scanning probe techniques. Polarized Raman spectral analysis indicates that the nearly tetragonal films have monoclinic (Cc) rather than P4mm tetragonal symmetry. Through local switching-spectroscopy measurements and piezoresponse force microscopy, we provide clear evidence of ferroelectric switching of the tetragonal phase, but the polarization direction, and therefore its switching, deviates strongly from the expected (001) tetragonal axis. We also demonstrate a large and reversible, electrically driven structural phase transition from the tetragonal to the rhombohedral polymorph in this material, which is promising for a plethora of applications.

AB - We have investigated the nanoscale switching properties of strain-engineered BiFeO3 thin films deposited on LaAlO3 substrates using a combination of scanning probe techniques. Polarized Raman spectral analysis indicates that the nearly tetragonal films have monoclinic (Cc) rather than P4mm tetragonal symmetry. Through local switching-spectroscopy measurements and piezoresponse force microscopy, we provide clear evidence of ferroelectric switching of the tetragonal phase, but the polarization direction, and therefore its switching, deviates strongly from the expected (001) tetragonal axis. We also demonstrate a large and reversible, electrically driven structural phase transition from the tetragonal to the rhombohedral polymorph in this material, which is promising for a plethora of applications.

KW - Ferroelectric tunnel junction

KW - Ferroelectricity

KW - Morphotropic phase transition

KW - Multiferroics

KW - Piezoresponse force microscopy

KW - Spintronics

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JO - Nano Letters

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Nanoscale switching characteristics of nearly tetragonal BiFeO₃ thin films

Abstract

Keywords

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