Finite Size Effects in Antiferromagnetic Highly Strained BiFeO<sub>3</sub> Multiferroic Films

Abstract Epitaxially strain‐engineered tetragonal (T)‐like BiFeO 3 (BFO) is a multiferroic material with unique crystallographic and physical properties compared to its bulk rhombohedral parent. While the effect of this structural change on ferroelectric properties is understood, the influence on correlated antiferromagnetic (AFM) properties, especially with reduced film thickness, is less clear. Here, the AFM behavior of T‐like BFO films 9–58 nm thick on LaAlO 3 (001) substrates fabricated by pulsed laser deposition was studied using conversion electron Mössbauer spectroscopy and X‐ray diffraction. The key findings include: i) Ultrathin T‐like BFO films (&lt;10 nm) show a decoupling of magnetic and structural transitions, with the polar vector tilted 32 degrees from [001] in 9–13 nm films. ii) Films thinner than 13 nm exhibit no structural transition down to 150 K, with a Néel (T N ) transition at ≈290 K, ≈35 K lower than thicker films. Interestingly, the T N scaling with thickness suggests realistic scaling exponents considering a critical correlation length for C‐type AFM order, rather than G‐type. The results show that finite size effects can tailor transition temperatures and modulate AFM wave modes in antiferromagnetic oxides, with implications for AFM spintronics for future information technologies.

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Publication Details

Journal
Advanced Physics Research
Published
2024-08-11
DOI
https://doi.org/10.1002/apxr.202400068
Citations
2
Primary Topic
Multiferroics and related materials
Type
article
Field-Weighted Citation Impact
0.24

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article

Finite Size Effects in Antiferromagnetic Highly Strained BiFeO3 Multiferroic Films

Shintaro Yasui, J. Juraszek, Florian Appert, Vincent Garcia et al.
2 citations
Advanced Physics Research
Multiferroics and related materials
0.24
article

Finite Size Effects in Antiferromagnetic Highly Strained BiFeO3 Multiferroic Films

Shintaro Yasui, J. Juraszek, Florian Appert, Vincent Garcia, Manuel Bibès, Dimitrios Bessas, Brahim Dkhil, Daniel Sando, V. Nagarajan, Abdeslem Findiki, Oliver Paull, Cécile Carrétéro, A. Barthélémy
article en
2 citations

Abstract

Abstract Epitaxially strain‐engineered tetragonal (T)‐like BiFeO 3 (BFO) is a multiferroic material with unique crystallographic and physical properties compared to its bulk rhombohedral parent. While the effect of this structural change on ferroelectric properties is understood, the influence on correlated antiferromagnetic (AFM) properties, especially with reduced film thickness, is less clear. Here, the AFM behavior of T‐like BFO films 9–58 nm thick on LaAlO 3 (001) substrates fabricated by pulsed laser deposition was studied using conversion electron Mössbauer spectroscopy and X‐ray diffraction. The key findings include: i) Ultrathin T‐like BFO films (&lt;10 nm) show a decoupling of magnetic and structural transitions, with the polar vector tilted 32 degrees from [001] in 9–13 nm films. ii) Films thinner than 13 nm exhibit no structural transition down to 150 K, with a Néel (T N ) transition at ≈290 K, ≈35 K lower than thicker films. Interestingly, the T N scaling with thickness suggests realistic scaling exponents considering a critical correlation length for C‐type AFM order, rather than G‐type. The results show that finite size effects can tailor transition temperatures and modulate AFM wave modes in antiferromagnetic oxides, with implications for AFM spintronics for future information technologies.

Advanced Physics ResearchVol. 3(12)
Tokyo Institute of Technology (JP), Centre National de la Recherche Scientifique (FR), University of Canterbury (NZ), Université Paris-Saclay (FR), European Synchrotron Radiation Facility (FR), UNSW Sydney (AU), Normandie Université (FR), CentraleSupélec (FR), Division of Materials Science and Engineering (AU), Thales (France) (FR), Université de Rouen Normandie (FR), Institut National des Sciences Appliquées Rouen Normandie (FR), MacDiarmid Institute for Advanced Materials and Nanotechnology (NZ)
University of Canterbury, Australian Government, Japan Society for the Promotion of Science, Institute of Innovative Research, Tokyo Institute of Technology, Centre of Excellence in Future Low-Energy Electronics Technologies, Australian Research Council
Openalex Percentile: Top 59%
Multiferroics and related materials
0.24
DOIOpen Access PDFOpenAlex
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