[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
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