Exploiting Symmetry Mismatch to Control Magnetism in a Ferroelastic Heterostructure

Er Jia Guo; Ryan Desautels; Dongkyu Lee; Manuel A. Roldan; Zhaoliang Liao; Timothy Charlton; Haile Ambaye; Jamie Molaison; Reinhard Boehler; David Keavney; Andreas Herklotz; T. Zac Ward; Ho Nyung Lee; Michael R. Fitzsimmons

doi:10.1103/PhysRevLett.122.187202

Exploiting Symmetry Mismatch to Control Magnetism in a Ferroelastic Heterostructure

Er Jia Guo, Ryan Desautels, Dongkyu Lee, Manuel A. Roldan, Zhaoliang Liao, Timothy Charlton, Haile Ambaye, Jamie Molaison, Reinhard Boehler, David Keavney, Andreas Herklotz, T. Zac Ward, Ho Nyung Lee, Michael R. Fitzsimmons

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30 Scopus citations

Abstract

In the bulk, LaCoO3 (LCO) is a paramagnet, yet the lowerature ferromagnetism (FM) is observed in tensile strained thin films, and its origin remains unresolved. Here, we quantitatively measured the distribution of atomic density and magnetization in LCO films by polarized neutron reflectometry (PNR) and found that the LCO layers near the heterointerfaces exhibit a reduced magnetization but an enhanced atomic density, whereas the film's interior (i.e., its film bulk) shows the opposite trend. We attribute the nonuniformity to the symmetry mismatch at the interface, which induces a structural distortion related to the ferroelasticity of LCO. This assertion is tested by systematic application of hydrostatic pressure during the PNR experiments. The magnetization can be controlled at a rate of-20.4% per GPa. These results provide unique insights into mechanisms driving FM in strained LCO films while offering a tantalizing observation that tunable deformation of the CoO6 octahedra in combination with the ferroelastic order parameter.

Original language	English
Article number	187202
Journal	Physical Review Letters
Volume	122
Issue number	18
DOIs	https://doi.org/10.1103/PhysRevLett.122.187202
State	Published - May 8 2019

Funding

We thank Y. Liu, F. Ye, W. Tian, N. Pradhan, C. Sohn, X. Gao, H. Jeen, and F. A. Reboredo for valuable discussions. We also thank J. Wenzel for designing the cryostat used for the high-pressure cell. This work was supported by the U.S. Department of Energy (DOE), Office of Science (OS), Basic Energy Sciences (BES), Materials Sciences and Engineering Division (sample deposition and characterization). During the manuscript revision, E. J. G. was supported by the Hundred Talent Program of Chinese Academy of Sciences. The research at ORNL’s SNS (PNR measurements), which is a DOE, BES scientific user facility, was conducted via user proposals. This research used resources of the Advanced Photon Source, a U.S. DOE, OS user facility operated for the DOE by Argonne National Laboratory under Contract No. DE-AC02-06CH1135.

Funders	Funder number
Division of Materials Sciences and Engineering
U.S. Department of Energy
Chinese Academy of Sciences
U.S. Department of Energy
Basic Energy Sciences
Argonne National Laboratory	DE-AC02-06CH1135
Office of Science

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10.1103/PhysRevLett.122.187202

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Guo, E. J., Desautels, R., Lee, D., Roldan, M. A., Liao, Z., Charlton, T., Ambaye, H., Molaison, J., Boehler, R., Keavney, D., Herklotz, A., Ward, T. Z., Lee, H. N., & Fitzsimmons, M. R. (2019). Exploiting Symmetry Mismatch to Control Magnetism in a Ferroelastic Heterostructure. Physical Review Letters, 122(18), Article 187202. https://doi.org/10.1103/PhysRevLett.122.187202

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title = "Exploiting Symmetry Mismatch to Control Magnetism in a Ferroelastic Heterostructure",

abstract = "In the bulk, LaCoO3 (LCO) is a paramagnet, yet the lowerature ferromagnetism (FM) is observed in tensile strained thin films, and its origin remains unresolved. Here, we quantitatively measured the distribution of atomic density and magnetization in LCO films by polarized neutron reflectometry (PNR) and found that the LCO layers near the heterointerfaces exhibit a reduced magnetization but an enhanced atomic density, whereas the film's interior (i.e., its film bulk) shows the opposite trend. We attribute the nonuniformity to the symmetry mismatch at the interface, which induces a structural distortion related to the ferroelasticity of LCO. This assertion is tested by systematic application of hydrostatic pressure during the PNR experiments. The magnetization can be controlled at a rate of-20.4% per GPa. These results provide unique insights into mechanisms driving FM in strained LCO films while offering a tantalizing observation that tunable deformation of the CoO6 octahedra in combination with the ferroelastic order parameter.",

author = "Guo, {Er Jia} and Ryan Desautels and Dongkyu Lee and Roldan, {Manuel A.} and Zhaoliang Liao and Timothy Charlton and Haile Ambaye and Jamie Molaison and Reinhard Boehler and David Keavney and Andreas Herklotz and Ward, {T. Zac} and Lee, {Ho Nyung} and Fitzsimmons, {Michael R.}",

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AU - Ambaye, Haile

AU - Molaison, Jamie

AU - Boehler, Reinhard

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N2 - In the bulk, LaCoO3 (LCO) is a paramagnet, yet the lowerature ferromagnetism (FM) is observed in tensile strained thin films, and its origin remains unresolved. Here, we quantitatively measured the distribution of atomic density and magnetization in LCO films by polarized neutron reflectometry (PNR) and found that the LCO layers near the heterointerfaces exhibit a reduced magnetization but an enhanced atomic density, whereas the film's interior (i.e., its film bulk) shows the opposite trend. We attribute the nonuniformity to the symmetry mismatch at the interface, which induces a structural distortion related to the ferroelasticity of LCO. This assertion is tested by systematic application of hydrostatic pressure during the PNR experiments. The magnetization can be controlled at a rate of-20.4% per GPa. These results provide unique insights into mechanisms driving FM in strained LCO films while offering a tantalizing observation that tunable deformation of the CoO6 octahedra in combination with the ferroelastic order parameter.

AB - In the bulk, LaCoO3 (LCO) is a paramagnet, yet the lowerature ferromagnetism (FM) is observed in tensile strained thin films, and its origin remains unresolved. Here, we quantitatively measured the distribution of atomic density and magnetization in LCO films by polarized neutron reflectometry (PNR) and found that the LCO layers near the heterointerfaces exhibit a reduced magnetization but an enhanced atomic density, whereas the film's interior (i.e., its film bulk) shows the opposite trend. We attribute the nonuniformity to the symmetry mismatch at the interface, which induces a structural distortion related to the ferroelasticity of LCO. This assertion is tested by systematic application of hydrostatic pressure during the PNR experiments. The magnetization can be controlled at a rate of-20.4% per GPa. These results provide unique insights into mechanisms driving FM in strained LCO films while offering a tantalizing observation that tunable deformation of the CoO6 octahedra in combination with the ferroelastic order parameter.

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Exploiting Symmetry Mismatch to Control Magnetism in a Ferroelastic Heterostructure

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