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Orbital Reconstruction Enhanced Exchange Bias in La0.6Sr0.4MnO3/Orthorhombic YMnO3 Heterostructures.

Zheng D, Jin C, Li P, Wang L, Feng L, Mi W, Bai H - Sci Rep (2016)

Bottom Line: In this work, an orbital reconstruction enhanced exchange bias was discovered.As La0.6Sr0.4MnO3 (LSMO) grown on YMnO3 (YMO) suffers a tensile strain (a > c), the doubly degenerate eg orbital splits into high energy 3z(2) - r(2) and low energy x(2) - y(2) orbitals, which makes electrons occupy the localized x(2) - y(2) orbital and leads to the formation of antiferromagnetic phase in LSMO.The orbital reconstruction induced antiferromagnetic phase enhances the exchange bias in the LSMO/YMO heterostructures, lightening an effective way for electric-field modulated magnetic moments in multiferroic magnetoelectric devices.

View Article: PubMed Central - PubMed

Affiliation: Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparation Technology, Institute of Advanced Materials Physics, Faculty of Science, Tianjin University, Tianjin 300072, China.

ABSTRACT
The exchange bias in ferromagnetic/multiferroic heterostructures is usually considered to originate from interfacial coupling. In this work, an orbital reconstruction enhanced exchange bias was discovered. As La0.6Sr0.4MnO3 (LSMO) grown on YMnO3 (YMO) suffers a tensile strain (a > c), the doubly degenerate eg orbital splits into high energy 3z(2) - r(2) and low energy x(2) - y(2) orbitals, which makes electrons occupy the localized x(2) - y(2) orbital and leads to the formation of antiferromagnetic phase in LSMO. The orbital reconstruction induced antiferromagnetic phase enhances the exchange bias in the LSMO/YMO heterostructures, lightening an effective way for electric-field modulated magnetic moments in multiferroic magnetoelectric devices.

No MeSH data available.


Related in: MedlinePlus

Orbital reconstruction of LSMO layers in the heterostructures, top panel: representation of the MnO6 octahedral distortions as a function of strain; middle panel: orbital reconstruction of the eg orbitals of Mn ions; bottom panel: calculated density states of Mn ions.
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f5: Orbital reconstruction of LSMO layers in the heterostructures, top panel: representation of the MnO6 octahedral distortions as a function of strain; middle panel: orbital reconstruction of the eg orbitals of Mn ions; bottom panel: calculated density states of Mn ions.

Mentions: How does the tensile strain affect the EB effect? In manganites, the key parameter governing the physical properties is the Mn3+ 3d4 orbital configuration. In spherical symmetry, the 3d orbitals are five-folds degenerate. For the unstrained perovskite manganites, as shown in the top panel of Fig. 5, the Mn3+ ion is surrounded by six O2− with the octahedral symmetry. The wave function of eg orbital stretches along the <100> axes on which the nearest neighbor O2− is located, so that the eg orbital is increased with doubly degenerate because of the strong Coulomb interaction between the negatively charged electron and the O2−. When the MnO6 octahedral suffers a tensile (a > c) strain, the Coulomb interaction is suppressed and the x2 − y2 orbital shifts to the low energy orbital. Thus the eg electron tends to occupy it and becomes localized. Due to the orbital reconstruction of the eg electron, the double exchange interaction is suppressed and the layer-typed antiferromagnetic order is formed16373839.


Orbital Reconstruction Enhanced Exchange Bias in La0.6Sr0.4MnO3/Orthorhombic YMnO3 Heterostructures.

Zheng D, Jin C, Li P, Wang L, Feng L, Mi W, Bai H - Sci Rep (2016)

Orbital reconstruction of LSMO layers in the heterostructures, top panel: representation of the MnO6 octahedral distortions as a function of strain; middle panel: orbital reconstruction of the eg orbitals of Mn ions; bottom panel: calculated density states of Mn ions.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4836304&req=5

f5: Orbital reconstruction of LSMO layers in the heterostructures, top panel: representation of the MnO6 octahedral distortions as a function of strain; middle panel: orbital reconstruction of the eg orbitals of Mn ions; bottom panel: calculated density states of Mn ions.
Mentions: How does the tensile strain affect the EB effect? In manganites, the key parameter governing the physical properties is the Mn3+ 3d4 orbital configuration. In spherical symmetry, the 3d orbitals are five-folds degenerate. For the unstrained perovskite manganites, as shown in the top panel of Fig. 5, the Mn3+ ion is surrounded by six O2− with the octahedral symmetry. The wave function of eg orbital stretches along the <100> axes on which the nearest neighbor O2− is located, so that the eg orbital is increased with doubly degenerate because of the strong Coulomb interaction between the negatively charged electron and the O2−. When the MnO6 octahedral suffers a tensile (a > c) strain, the Coulomb interaction is suppressed and the x2 − y2 orbital shifts to the low energy orbital. Thus the eg electron tends to occupy it and becomes localized. Due to the orbital reconstruction of the eg electron, the double exchange interaction is suppressed and the layer-typed antiferromagnetic order is formed16373839.

Bottom Line: In this work, an orbital reconstruction enhanced exchange bias was discovered.As La0.6Sr0.4MnO3 (LSMO) grown on YMnO3 (YMO) suffers a tensile strain (a > c), the doubly degenerate eg orbital splits into high energy 3z(2) - r(2) and low energy x(2) - y(2) orbitals, which makes electrons occupy the localized x(2) - y(2) orbital and leads to the formation of antiferromagnetic phase in LSMO.The orbital reconstruction induced antiferromagnetic phase enhances the exchange bias in the LSMO/YMO heterostructures, lightening an effective way for electric-field modulated magnetic moments in multiferroic magnetoelectric devices.

View Article: PubMed Central - PubMed

Affiliation: Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparation Technology, Institute of Advanced Materials Physics, Faculty of Science, Tianjin University, Tianjin 300072, China.

ABSTRACT
The exchange bias in ferromagnetic/multiferroic heterostructures is usually considered to originate from interfacial coupling. In this work, an orbital reconstruction enhanced exchange bias was discovered. As La0.6Sr0.4MnO3 (LSMO) grown on YMnO3 (YMO) suffers a tensile strain (a > c), the doubly degenerate eg orbital splits into high energy 3z(2) - r(2) and low energy x(2) - y(2) orbitals, which makes electrons occupy the localized x(2) - y(2) orbital and leads to the formation of antiferromagnetic phase in LSMO. The orbital reconstruction induced antiferromagnetic phase enhances the exchange bias in the LSMO/YMO heterostructures, lightening an effective way for electric-field modulated magnetic moments in multiferroic magnetoelectric devices.

No MeSH data available.


Related in: MedlinePlus