Tuning La0.7Sr0.3MnO3 magnetic anisotropy via interfacial coupling in homometallic trilayers

Abstract

In this work we explore the complex magnetic behaviour of SrMnO3/La0.7Sr0.3MnO3/SrMnO3 trilayers combining magneto-optic Kerr effect (MOKE) and magneto-resistance measurements. The interplay of structural and orbital reconstruction and the competition of ferromagnetism/antiferromagnetism at the interfaces is responsible of a variety of complex magnetic properties, highlighting the use of heterostructures as an effective strategy to tune and control magnetic behaviour. We demonstrate the possibility to tune the magnetic properties of a ferromagnetic La0.7Sr0.3MnO3 (LSMO) layer, embedded in two homometallic antiferromagnetic layers (SrMnO3, SMO), by properly varying the role of interfaces using two different LSMO thickness values. Spin reorientation of the LSMO magnetic easy axis away from its room temperature orientation was observed below 125 K, due to the predominance of exchange interaction at the interface over the substrate-induced magnetic anisotropy, in agreement with established models for homometallic manganite heterostructures. The competition of super-exchange and exchange interactions at the interface results in a highly frustrated interfacial spin glass state, resulting in 20-fold enhancement of the coercive field and exchange bias. The modification of the magnetocrystalline anisotropy driven by the interfacial effects leads to a change in the anisotropic magneto-resistance response of the system, which dominates the low temperature behaviour.

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Cite

BibTeX RIS

BibTeX

@misc{coppola2026tuning,
  title = {{Tuning La0.7Sr0.3MnO3 magnetic anisotropy via interfacial coupling in homometallic trilayers}},
  author = {Nunzia Coppola and Giovanni Vinai and Alksandr Yu Petrov and Chiara Sacco and Hafiz Sami Ur Rehman and Sofia Scarnicci and Lucia Capogna and Cinzia Di Giorgio and Carmela Aruta and Luigi Maritato and Alice Galdi},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.37736},
  eprint = {2610.37736},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.37736},
  note = {CC BY 4.0},
}

RIS

TY  - UNPB
TI  - Tuning La0.7Sr0.3MnO3 magnetic anisotropy via interfacial coupling in homometallic trilayers
AU  - Nunzia Coppola
AU  - Giovanni Vinai
AU  - Alksandr Yu Petrov
AU  - Chiara Sacco
AU  - Hafiz Sami Ur Rehman
AU  - Sofia Scarnicci
AU  - Lucia Capogna
AU  - Cinzia Di Giorgio
AU  - Carmela Aruta
AU  - Luigi Maritato
AU  - Alice Galdi
PY  - 2026
DA  - 2026/10/27
PB  - arXiv
DO  - 10.48550/arxiv.2610.37736
UR  - https://arxiv.org/abs/2610.37736
AB  - In this work we explore the complex magnetic behaviour of SrMnO3/La0.7Sr0.3MnO3/SrMnO3 trilayers combining magneto-optic Kerr effect (MOKE) and magneto-resistance measurements. The interplay of structural and orbital reconstruction and the competition of ferromagnetism/antiferromagnetism at the interfaces is responsible of a variety of complex magnetic properties, highlighting the use of heterostructures as an effective strategy to tune and control magnetic behaviour. We demonstrate the possibility to tune the magnetic properties of a ferromagnetic La0.7Sr0.3MnO3 (LSMO) layer, embedded in two homometallic antiferromagnetic layers (SrMnO3, SMO), by properly varying the role of interfaces using two different LSMO thickness values. Spin reorientation of the LSMO magnetic easy axis away from its room temperature orientation was observed below 125 K, due to the predominance of exchange interaction at the interface over the substrate-induced magnetic anisotropy, in agreement with established models for homometallic manganite heterostructures. The competition of super-exchange and exchange interactions at the interface results in a highly frustrated interfacial spin glass state, resulting in 20-fold enhancement of the coercive field and exchange bias. The modification of the magnetocrystalline anisotropy driven by the interfacial effects leads to a change in the anisotropic magneto-resistance response of the system, which dominates the low temperature behaviour.
ER  -

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