Expansion of the spin cycloid in multiferroic BiFeO3 thin films

Burns, Stuart R.; Sando, Daniel; Xu, Bin; Dupé, Bertrand; Russell, Lachlan; Deng, Guochu; Clements, Richard; Paull, Oliver H. C.; Seidel, Jan; Bellaiche, Laurent; Valanoor, Nagarajan; Ulrich, Clemens

doi:10.1038/s41535-019-0155-2

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Expansion of the spin cycloid in multiferroic BiFeO3 thin films

Burns, Stuart R.; Sando, Daniel; Xu, Bin et al.

2019 • In npj Quantum Materials, 4 (1), p. 18

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https://hdl.handle.net/2268/243262

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10.1038/s41535-019-0155-2

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Keywords :

BFO; Heff; neutron; spin spiral BFO; spin spiral

Abstract :

[en] Understanding and manipulating complex spin texture in multiferroics can offer new perspectives for electric field-controlled spin manipulation. In BiFeO3, a well-known room temperature multiferroic, the competition between various exchange interactions manifests itself as non-collinear spin order, i.e., an incommensurate spin cycloid with period 64 nm. We report on the stability and systematic expansion of the length of the spin cycloid in (110)-oriented epitaxial Co-doped BiFeO3 thin films. Neutron diffraction shows (i) this cycloid, despite its partly out-of-plane canted propagation vector, can be stabilized in thinnest films; (ii) the cycloid length expands significantly with decreasing film thickness; (iii) theory confirms a unique [112] cycloid propagation direction; and (iv) in the temperature dependence the cycloid length expands significantly close to TN. These observations are supported by Monte Carlo simulations based on a first-principles effective Hamiltonian method. Our results therefore offer new opportunities for nanoscale magnonic devices based on complex spin textures.

Disciplines :

Physics

Author, co-author :

Burns, Stuart R.

Sando, Daniel

Xu, Bin ; Université de Liège - ULiège > Département de physique > Physique des matériaux et nanostructures

Dupé, Bertrand ; Université de Liège - ULiège > Département de physique > Physique des matériaux et nanostructures

Russell, Lachlan

Deng, Guochu

Clements, Richard

Paull, Oliver H. C.

Seidel, Jan

Bellaiche, Laurent

Valanoor, Nagarajan

Ulrich, Clemens

Language :

English

Title :

Expansion of the spin cycloid in multiferroic BiFeO3 thin films

Publication date :

2019

Journal title :

npj Quantum Materials

eISSN :

2397-4648

Publisher :

Nature Publishing Group, United Kingdom

Volume :

Issue :

Pages :

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://www.nature.com/articles/s41535-019-0155-2

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since 16 January 2020

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