Emergence of exchange bias and giant coercive field enhancement by internal magnetic frustration in La0.67Sr0.33MnO3 thin films

Basaran, Ali C.; Monton, C.; Trastoy, J.; Bernard, R.; Bouzehouane, K.; Villegas, J. E.; Schuller, Ivan K.

doi:10.1016/j.jmmm.2022.169077

Title: Emergence of exchange bias and giant coercive field enhancement by internal magnetic frustration in La_0.67Sr_0.33MnO₃ thin films

Journal Article · 20 January 2022 · Journal of Magnetism and Magnetic Materials

DOI: https://doi.org/10.1016/j.jmmm.2022.169077 · OSTI ID:1977335

Basaran, Ali C. ^[1]; Monton, C. ^[2]; Trastoy, J. ^[3]; Bernard, R. ^[3]; Bouzehouane, K. ^[3]; Villegas, J. E. ^[3]; Schuller, Ivan K. ^[4]

Univ. of California, San Diego, CA (United States); OSTI
Univ. of California, San Diego, CA (United States); General Atomics, San Diego, CA (United States)
Univ. Paris-Saclay, Palaiseau (France); Centre National de la Recherche Scientifique (CNRS) (France)
Univ. of California, San Diego, CA (United States)

We have studied the influence of controlled defects on the magnetic properties of La_0.67Sr_0.33MnO₃ (LSMO) thin films. We used 100 nm thick epitaxial LSMO films, which were grown on SrTiO₃ substrates and introduced stoichiometry changes and defects using oxygen ion irradiation through nanoporous alumina masks. Oxygen irradiation through the mask creates cascades of defects in spatially-modulated regions in the plane of the LSMO film. The magnetic properties of the samples were compared before and after the irradiation. We have found that irradiation reduces the ferromagnetic ordering temperature, decreases the total magnetization, enhances the coercivity, and induces exchange bias below 50 K. The coercivity enhancement is dramatically higher below 50 K and can be associated with exchange bias. These results can be explained by the formation of Mn-rich antiferromagnetic or ferrimagnetic phases within the bombarded regions that are exchange coupled to the non-irradiated - ferromagnetic host.

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Research Organization:: Univ. of California, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-87ER45332

OSTI ID:: 1977335

Journal Information:: Journal of Magnetism and Magnetic Materials, Journal Name: Journal of Magnetism and Magnetic Materials Journal Issue: C Vol. 550; ISSN 0304-8853

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
LSMO thin films
coercive field enhancement
exchange bias
ion bombardment
materials science
physics

Title: Emergence of exchange bias and giant coercive field enhancement by internal magnetic frustration in La0.67Sr0.33MnO3 thin films

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Title: Emergence of exchange bias and giant coercive field enhancement by internal magnetic frustration in La_0.67Sr_0.33MnO₃ thin films