Origin of anomalous magnetite properties in crystallographic matched heterostructures: Fe3O4(111)/MgAl2O4(111)

Daniel Gilks; Leonardo Lari; James Naughton; O Cespedes; Z Cai; A Gerber; Sarah Madeleine Thompson; K Zeimer; Vlado Lazarov

doi:10.1088/0953-8984/25/48/485004

Origin of anomalous magnetite properties in crystallographic matched heterostructures: Fe₃O₄(111)/MgAl₂O₄(111)

Daniel Gilks, Leonardo Lari, James Naughton, O Cespedes, Z Cai, A Gerber, Sarah Madeleine Thompson, K Zeimer, Vlado Lazarov

Physics

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

Abstract

Magnetite films grown on crystallographically matched substrates such as MgAl₂O₄ are not expected to show anomalous properties such as negative magnetoresistance and high saturation fields. By atomic resolution imaging using scanning transmission electron microscopy we show direct evidence of anti-phase domain boundaries (APB) present in these heterostructures. Experimentally identified 1/4<10-1> shifts determine the atomic structure of the observed APBs. The dominant non-bulk superexchange interactions are between 180^o octahedral-Fe/O/octahedral-Fe sites which provide strong antiferromagnetic coupling across the defect interface resulting in non-bulk magnetic and magneto transport properties.

Original language	English
Article number	485004
Number of pages	8
Journal	Journal of physics : Condensed matter
Volume	25
Issue number	48
Early online date	31 Oct 2013
DOIs	https://doi.org/10.1088/0953-8984/25/48/485004
Publication status	Published - 4 Dec 2013

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10.1088/0953-8984/25/48/485004

http://iopscience.iop.org/0953-8984/25/48/485004

Cite this

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title = "Origin of anomalous magnetite properties in crystallographic matched heterostructures: Fe3O4(111)/MgAl2O4(111)",

abstract = "Magnetite films grown on crystallographically matched substrates such as MgAl2O4 are not expected to show anomalous properties such as negative magnetoresistance and high saturation fields. By atomic resolution imaging using scanning transmission electron microscopy we show direct evidence of anti-phase domain boundaries (APB) present in these heterostructures. Experimentally identified 1/4<10-1> shifts determine the atomic structure of the observed APBs. The dominant non-bulk superexchange interactions are between 180o octahedral-Fe/O/octahedral-Fe sites which provide strong antiferromagnetic coupling across the defect interface resulting in non-bulk magnetic and magneto transport properties.",

author = "Daniel Gilks and Leonardo Lari and James Naughton and O Cespedes and Z Cai and A Gerber and Thompson, {Sarah Madeleine} and K Zeimer and Vlado Lazarov",

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T1 - Origin of anomalous magnetite properties in crystallographic matched heterostructures

T2 - Fe3O4(111)/MgAl2O4(111)

AU - Gilks, Daniel

AU - Lari, Leonardo

AU - Naughton, James

AU - Cespedes, O

AU - Cai, Z

AU - Gerber, A

AU - Thompson, Sarah Madeleine

AU - Zeimer, K

AU - Lazarov, Vlado

PY - 2013/12/4

Y1 - 2013/12/4

N2 - Magnetite films grown on crystallographically matched substrates such as MgAl2O4 are not expected to show anomalous properties such as negative magnetoresistance and high saturation fields. By atomic resolution imaging using scanning transmission electron microscopy we show direct evidence of anti-phase domain boundaries (APB) present in these heterostructures. Experimentally identified 1/4<10-1> shifts determine the atomic structure of the observed APBs. The dominant non-bulk superexchange interactions are between 180o octahedral-Fe/O/octahedral-Fe sites which provide strong antiferromagnetic coupling across the defect interface resulting in non-bulk magnetic and magneto transport properties.

AB - Magnetite films grown on crystallographically matched substrates such as MgAl2O4 are not expected to show anomalous properties such as negative magnetoresistance and high saturation fields. By atomic resolution imaging using scanning transmission electron microscopy we show direct evidence of anti-phase domain boundaries (APB) present in these heterostructures. Experimentally identified 1/4<10-1> shifts determine the atomic structure of the observed APBs. The dominant non-bulk superexchange interactions are between 180o octahedral-Fe/O/octahedral-Fe sites which provide strong antiferromagnetic coupling across the defect interface resulting in non-bulk magnetic and magneto transport properties.

U2 - 10.1088/0953-8984/25/48/485004

DO - 10.1088/0953-8984/25/48/485004

M3 - Article

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VL - 25

JO - Journal of physics : Condensed matter

JF - Journal of physics : Condensed matter

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