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Observation of Mermin-Wagner behavior in LaFeO3/SrTiO3 superlattices.

ABSTRACT: Two-dimensional magnetic materials can exhibit new magnetic properties due to the enhanced spin fluctuations that arise in reduced dimension. However, the suppression of the long-range magnetic order in two dimensions due to long-wavelength spin fluctuations, as suggested by the Mermin-Wagner theorem, has been questioned for finite-size laboratory samples. Here we study the magnetic properties of a dimensional crossover in superlattices composed of the antiferromagnetic LaFeO3 and SrTiO3 that, thanks to their large lateral size, allowed examination using a sensitive magnetic probe - muon spin rotation spectroscopy. We show that the iron electronic moments in superlattices with 3 and 2 monolayers of LaFeO3 exhibit a static antiferromagnetic order. In contrast, in the superlattices with single LaFeO3 monolayer, the moments do not order and fluctuate to the lowest measured temperature as expected from the Mermin-Wagner theorem. Our work shows how dimensionality can be used to tune the magnetic properties of ultrathin films.

SUBMITTER: Kiaba M 

PROVIDER: S-EPMC11192889 | biostudies-literature | 2024 Jun

REPOSITORIES: biostudies-literature

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Observation of Mermin-Wagner behavior in LaFeO<sub>3</sub>/SrTiO<sub>3</sub> superlattices.

Kiaba M M   Suter A A   Salman Z Z   Prokscha T T   Chen B B   Koster G G   Dubroka A A  

Nature communications 20240622 1

Two-dimensional magnetic materials can exhibit new magnetic properties due to the enhanced spin fluctuations that arise in reduced dimension. However, the suppression of the long-range magnetic order in two dimensions due to long-wavelength spin fluctuations, as suggested by the Mermin-Wagner theorem, has been questioned for finite-size laboratory samples. Here we study the magnetic properties of a dimensional crossover in superlattices composed of the antiferromagnetic LaFeO<sub>3</sub> and SrT  ...[more]

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